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学者姓名：纪常伟
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摘要 ：
The flammability limits of the hydrogen-oxygen mixture are extremely wide, and the ignition energy is low. Due to its excellent combustion properties, the hydrogen-oxygen mixture can be used as fuel in internal combustion engines (ICEs). However, the combustion of hydrogen-oxygen mixture is too intense, which results in limited research on its application in ICEs and is limited to low-temperature conditions in aerospace. This research aims to numerically discuss the coupling effects of equivalence ratio and ignition timing on the port fuel injection hydrogen-oxygen ICE under the low-temperature intake condition. The three-dimensional geometric model of a single-cylinder ICE was established using the CONVERGE software and validated against the mean in-cylinder pressure and reaction mechanism. The results indicate that adjusting equivalence ratio and ignition timing operating parameters is beneficial for controlling the temperature and pressure in the cylinder within a reasonable range during the total combustion process. In general, under the low-temperature intake condition, adopting a high equivalence ratio and optimal ignition timing strategy improve the combustion process and power performance of the port fuel injection hydrogen-oxygen ICE.
关键词 ：
Port fuel injection Port fuel injection Hydrogen-oxygen internal combustion engine Hydrogen-oxygen internal combustion engine Combustion characteristics Combustion characteristics
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| GB/T 7714 | Ji, Changwei , Shen, Jianpu , Wang, Shuofeng . Numerical Investigation of Combustion Characteristics of the Port Fuel Injection Hydrogen-Oxygen Internal Combustion Engine Under the Low-Temperature Intake Condition [J]. | PROCEEDINGS OF THE 10TH HYDROGEN TECHNOLOGY CONVENTION, VOL 1, WHTC 2023 , 2024 , 393 : 25-34 . |
| MLA | Ji, Changwei 等. "Numerical Investigation of Combustion Characteristics of the Port Fuel Injection Hydrogen-Oxygen Internal Combustion Engine Under the Low-Temperature Intake Condition" . | PROCEEDINGS OF THE 10TH HYDROGEN TECHNOLOGY CONVENTION, VOL 1, WHTC 2023 393 (2024) : 25-34 . |
| APA | Ji, Changwei , Shen, Jianpu , Wang, Shuofeng . Numerical Investigation of Combustion Characteristics of the Port Fuel Injection Hydrogen-Oxygen Internal Combustion Engine Under the Low-Temperature Intake Condition . | PROCEEDINGS OF THE 10TH HYDROGEN TECHNOLOGY CONVENTION, VOL 1, WHTC 2023 , 2024 , 393 , 25-34 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Although pure hydrogen engines can achieve zero carbon and extremely low NOx emissions under ultra-lean combustion conditions, there are limitations with combustion stability and power performance. This paper combines turbulent jet ignition (TJI) and variable valve timing (VVT) technology, which not only improves the power output of pure hydrogen engines under ultra-lean combustion conditions but also ensures the engine's stable operation. Therefore, this research reveals the working characteristics of TJI engines under lean conditions through numerical methods and explores the optimization characteristics of VVT on engine power performance and stability through experiments. The results indicate that TJI utilizes strong turbulence and multiple-point ignition to improve the efficiency of the mixture and combustion speed, ensuring reliable ignition capability under ultra-lean operating and achieving a stable and effective combustion process. According to the experimental results, the combination of TJI with VVT technology can ensure engine cyclic-variability of less than 1.5 % and the maximum values of Brake mean effective pressure (BMEP) and Brake thermal efficiency (BTE) are 4.5 bar and 41.6 %, respectively. This innovative technology combination not only enables the efficient and ecofriendly development of the transportation industry but also holds significant importance for promoting carbon-free fuels and environmental protection in the future.
关键词 ：
Turbulent jet ignition Turbulent jet ignition Hydrogen Hydrogen Variable valve timing Variable valve timing Low emission Low emission Ultra-lean combustion Ultra-lean combustion
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| GB/T 7714 | Qiang, Yanfei , Jin, Kai , Zhao, Shihao et al. Optimization of power performance and combustion stability of ultra-lean combustion in hydrogen fuel engines through combined turbulent jet ignition and variable valve timing [J]. | FUEL , 2024 , 381 . |
| MLA | Qiang, Yanfei et al. "Optimization of power performance and combustion stability of ultra-lean combustion in hydrogen fuel engines through combined turbulent jet ignition and variable valve timing" . | FUEL 381 (2024) . |
| APA | Qiang, Yanfei , Jin, Kai , Zhao, Shihao , Cai, Jichun , Su, Fangxu , Wang, Shuofeng et al. Optimization of power performance and combustion stability of ultra-lean combustion in hydrogen fuel engines through combined turbulent jet ignition and variable valve timing . | FUEL , 2024 , 381 . |
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摘要 ：
Ammonia (NH3) is a potential alternative fuel for internal combustion engines to achieve zero-carbon emissions. And partial fuel dissociating is a feasible strategy to improve the reactivity of NH3, the hydrogen (H2) generated by dissociation can effectively promote the combustion of NH3. This study aims to experimentally investigate the ignition and combustion characteristics of partially dissociated NH3 ignited by passive turbulent jet ignition. The effects of the dissociation ratio and equivalence ratio were analyzed. The results show that the dissociation of NH3 improves the ignition and combustion performance of NH3, reflected in lower ignition delay and combustion duration. In addition, as the dissociation ratio increases, the ignition mechanism in the main chamber changes from jet ignition to flame ignition, which can significantly reduce the ignition delay. Lean conditions are more conducive to achieving flame ignition, the jet ignition mechanism on the rich side leads to a higher ignition delay compared to lean conditions at low dissociation ratios. However, the lean mixture shows a higher combustion duration due to its low reactivity. The inhibiting effect of additional nitrogen (N2) increases with the dissociation ratio, but the ignition mechanism and flame propagation in the main chamber are not significantly affected.
关键词 ：
Ammonia Ammonia Passive pre -chamber Passive pre -chamber Combustion characteristic Combustion characteristic Partial dissociation Partial dissociation Turbulent jet ignition Turbulent jet ignition
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| GB/T 7714 | Wang, Zhe , Zhang, Tianyue , Wang, Du et al. Experimental investigation on the combustion characteristics of partially dissociated ammonia ignited by passive turbulent jet ignition [J]. | APPLIED THERMAL ENGINEERING , 2024 , 247 . |
| MLA | Wang, Zhe et al. "Experimental investigation on the combustion characteristics of partially dissociated ammonia ignited by passive turbulent jet ignition" . | APPLIED THERMAL ENGINEERING 247 (2024) . |
| APA | Wang, Zhe , Zhang, Tianyue , Wang, Du , Wang, Shuofeng , Ji, Changwei , Wang, Huaiyu et al. Experimental investigation on the combustion characteristics of partially dissociated ammonia ignited by passive turbulent jet ignition . | APPLIED THERMAL ENGINEERING , 2024 , 247 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The mixture of ammonia (NH3) and hydrogen (H2) is the potential alternative fuel for internal combustion engines (ICEs). The turbulent jet ignition (TJI) system can provide high ignition energy and turbulent disturbance to promote the combustion of the mixture for NH3/H2 ICEs. Therefore, the combustion characteristics of NH3/ H2/air under passive TJI conditions were experimentally studied in the present study. The experiment was conducted in a constant volume combustion bomb, and the effect of fuel composition and equivalence ratio was investigated. The experimental results show that compared to spark ignition, the combustion of NH3/H2 can be effectively improved by using TJI, especially under high NH3 fraction conditions. The addition of H2 has a significant positive effect on the ignition and combustion performance. With the addition of H2, the ignition delay and combustion duration decrease evidently. And the H2 addition is beneficial for improving the ignition mechanism and achieving flame ignition. In addition, poor ignition performance may occur under rich conditions due to the fluid-dynamic quenching of the jet. However, the high flame propagation rate on the rich side still leads to lower combustion duration. Moreover, increasing the orifices number appropriately can enhance the ignition and combustion performance. The jet strength is weakened by the increased total orifice area and the ignition of NH3/H2 can be improved.
关键词 ：
Premixed flame Premixed flame Turbulent jet ignition Turbulent jet ignition Ammonia Ammonia Combustion characteristic Combustion characteristic Hydrogen Hydrogen
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| GB/T 7714 | Wang, Zhe , Ji, Changwei , Zhang, Tianyue et al. Experimental study on the combustion of NH3/H2/air based on the passive turbulent jet ignition [J]. | FUEL , 2024 , 365 . |
| MLA | Wang, Zhe et al. "Experimental study on the combustion of NH3/H2/air based on the passive turbulent jet ignition" . | FUEL 365 (2024) . |
| APA | Wang, Zhe , Ji, Changwei , Zhang, Tianyue , Wang, Shuofeng , Yang, Haowen , Zhai, Yifan et al. Experimental study on the combustion of NH3/H2/air based on the passive turbulent jet ignition . | FUEL , 2024 , 365 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Adopting ammonia (NH3) is considered a viable way to reduce carbon emissions. The combustion of NH3/air can be enhanced through the fuel dissociation strategy and the use of turbulent jet ignition (TJI). This study investigated the combustion of partially dissociated NH3 ignited by active TJI. It can be found that the hydrogen (H2) pre-chamber effectively enhances the combustion of partially dissociated NH3, and the appropriate rich prechamber equivalence ratio is beneficial for the main chamber ignition. The lean main chamber mixtures realize the flame ignition mechanism and show a lower ignition delay. The increase in dissociation ratio enhances the tolerance of ignition to turbulence and leads to flame ignition mechanism. The increase in dissociation ratio also enhances the inhibiting effect of additional nitrogen (N2) on combustion, but the ignition mechanism and flame shape are not sensitive to the additional N2.
关键词 ：
Fuel dissociation Fuel dissociation Ignition characteristics Ignition characteristics Turbulent jet ignition Turbulent jet ignition Ammonia Ammonia Hydrogen Hydrogen
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| GB/T 7714 | Wang, Zhe , Zhang, Tianyue , Wang, Shuofeng et al. Combustion characteristics of NH3/H2/N2/air adopting the H2-assisted turbulent jet ignition [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2024 , 78 : 83-91 . |
| MLA | Wang, Zhe et al. "Combustion characteristics of NH3/H2/N2/air adopting the H2-assisted turbulent jet ignition" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 78 (2024) : 83-91 . |
| APA | Wang, Zhe , Zhang, Tianyue , Wang, Shuofeng , Ji, Changwei . Combustion characteristics of NH3/H2/N2/air adopting the H2-assisted turbulent jet ignition . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2024 , 78 , 83-91 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
To reduce carbon emissions, the application of hydrogen as a zero-carbon fuel in the field of internal combustion engines (ICEs) has become a hot topic in recent years. Meanwhile, the application of ignition methods such as turbulent jet ignition (TJI) in engines has been gradually attracting the interest of numerous scholars. However, there is a lack of research on the performance of the hydrogen-fueled engine with passive pre-chamber (PPC). This paper aims to explore the combustion and emission performance of TJI hydrogen engines under different load conditions through experimental and numerical methods. This study is based on a Miller cycle engine equipped with the PPC, where hydrogen is injected directly into the cylinder. The operational characteristics of internal flow field characteristics, combustion, and energy conversion in the PPC are revealed by numerical. The engine operates at a speed of 1600 rpm and an excess air ratio (lambda) of 1.8. The results show that at a manifold absolute pressure (MAP) of 40 kPa, the brake mean effective pressure (BMEP) is 0.95 bar, and the brake thermal efficiency (BTE) is 17.26 %, with the coefficient of variation (COV) of the indicated mean effective pressure (COVIMEP) of 3.3 %. Although BMEP can be increased to 5.3 bar, BTE is 40.3 %, and COVIMEP can be reduced to 1.1 % under WOT, emissions have significantly increased. Additionally, the study explores the effect of variable valve timing (VVT) and spark timing (ST) on the performance of the hydrogen engine with PPC under partial load conditions. The results indicate that the ST has an insignificant influence on the power performance of TJI hydrogen engines, but delaying the ST could reduce nitrogen oxide (NOx) emissions. By appropriately delaying the timing of the intake valve opening (IVO), not only the power performance of TJI hydrogen engines could be improved, but also the COVIMEP could be reduced.
关键词 ：
Load Load Passive pre -chamber ignition Passive pre -chamber ignition Variable valve timing Variable valve timing Hydrogen Hydrogen Combustion analysis Combustion analysis
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| GB/T 7714 | Qiang, Yanfei , Ji, Changwei , Wang, Shuofeng et al. Study on the effect of variable valve timing and spark timing on the performance of the hydrogen-fueled engine with passive pre-chamber ignition under partial load conditions [J]. | ENERGY CONVERSION AND MANAGEMENT , 2024 , 302 . |
| MLA | Qiang, Yanfei et al. "Study on the effect of variable valve timing and spark timing on the performance of the hydrogen-fueled engine with passive pre-chamber ignition under partial load conditions" . | ENERGY CONVERSION AND MANAGEMENT 302 (2024) . |
| APA | Qiang, Yanfei , Ji, Changwei , Wang, Shuofeng , Xin, Gu , Hong, Chen , Wang, Zhe et al. Study on the effect of variable valve timing and spark timing on the performance of the hydrogen-fueled engine with passive pre-chamber ignition under partial load conditions . | ENERGY CONVERSION AND MANAGEMENT , 2024 , 302 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper explores the combustion and emission characteristics of TJI ammonia/hydrogen (NH3/H2) dual-fuel engines through experiments and numerical simulations. The NH3/H2 engine operates at 1600 rpm with a manifold absolute pressure of 60 kPa. Two independent hydrogen supply systems enable hydrogen port injection (HPI) and hydrogen direct injection (HDI). The results indicate that HDI yields higher power output compared to HPI. The strong injection ignition ability of the pre-chamber (PC) realizes the stable combustion of the NH3/H2 engine under different ammonia volume share (AVS) conditions. With the increase of AVS, the mixture of HDI in PC is stratified and the jet velocity is significantly reduced. Power output under HDI conditions decreases with increasing AVS. At an AVS of 10 %, the brake mean effective pressure (BMEP) and brake thermal efficiency (BTE) reach maximum values of 3.67 bar and 30.25 %, respectively. The BMEP and BTE increase and then decrease with increasing AVS under HPI conditions. An AVS of 40 % achieves peak power and efficiency. The CA10-90 is always shorter than CA0-10 in the combustion process. At an AVS of 20 %, NO emissions peak and then decrease with increasing AVS, but higher AVS increases unburned NH3 and N2O. Experimental results show that spark timing (ST) has relatively low sensitivity to H2-dominated TJI NH3/H2 combustion. With the increase of AVS to 60 %, the delayed ST will lead to a rapid decrease in power output and a sharp deterioration in combustion stability. When the ST is postponed from 12 degrees CA BTDC to 4 degrees CA ATDC, and AVS is 60 %, the COVPmax of the TJI engine increases rapidly from 1.9 % to 13.9 %.
关键词 ：
Turbulent jet ignition Turbulent jet ignition Emission Emission Ammonia-hydrogen engine Ammonia-hydrogen engine Spark timing Spark timing Passive pre-chamber Passive pre-chamber
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| GB/T 7714 | Qiang, Yanfei , Zhao, Shihao , Su, Fangxu et al. Experimental and numerical assessment on co-combustion of hydrogen with ammonia in passive pre-chamber engines [J]. | APPLIED THERMAL ENGINEERING , 2024 , 259 . |
| MLA | Qiang, Yanfei et al. "Experimental and numerical assessment on co-combustion of hydrogen with ammonia in passive pre-chamber engines" . | APPLIED THERMAL ENGINEERING 259 (2024) . |
| APA | Qiang, Yanfei , Zhao, Shihao , Su, Fangxu , Wang, Fuzhi , Yang, Jinxin , Wang, Shuofeng et al. Experimental and numerical assessment on co-combustion of hydrogen with ammonia in passive pre-chamber engines . | APPLIED THERMAL ENGINEERING , 2024 , 259 . |
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摘要 ：
This paper aims to numerically investigate the effects of high compression ratio (CR) on the performance of ammonia-hydrogen engines. In this work, four CRs from 10.7 to 13.7 with scanning spark timing (ST) from 28(degrees)CA to 0(degrees)CA BTDC were analyzed. The main results are as follows: As the CR increases, there is a trade-off relationship between the dissipation rate of turbulence and the turbulent kinetic energy (TICE). Initially, the TICE rises as the CR increases. As the CR continues to rise, the tendency for an increase in TICE diminishes, while the turbulent dissipation rate consistently rises. Additionally, there is an escalation in heat transfer loss. Therefore, there is a trend of rising and then falling in the flow velocity and turbulence intensity with the increase of the CR. Ammonia-hydrogen flame propagation is susceptible to temperature and flow field, and a high CR can improve ignition stability, shorten combustion duration, minimize cooling loss, and enhance output power. Unfortunately, the emission of NOx gradually rises as the CR increases. At high CR, the combustion performance is optimized by adjusting ST, and the maximum IMEP and ITE are 4 bar and 38.3 %, respectively. The ST for maximum braking torque (MBT) should be gradually delayed toward TDC as the CR increases.
关键词 ：
Spark-ignition timing Spark-ignition timing Ammonia Ammonia SI engine SI engine Compression ratio Compression ratio Combustion Combustion Hydrogen Hydrogen
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| GB/T 7714 | Ji, Changwei , Qiang, Yanfei , Wang, Shuofeng et al. Numerical investigation on the combustion performance of ammonia-hydrogen spark-ignition engine under various high compression ratios and different spark-ignition timings [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2024 , 56 : 817-827 . |
| MLA | Ji, Changwei et al. "Numerical investigation on the combustion performance of ammonia-hydrogen spark-ignition engine under various high compression ratios and different spark-ignition timings" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 56 (2024) : 817-827 . |
| APA | Ji, Changwei , Qiang, Yanfei , Wang, Shuofeng , Xin, Gu , Wang, Zhe , Hong, Chen et al. Numerical investigation on the combustion performance of ammonia-hydrogen spark-ignition engine under various high compression ratios and different spark-ignition timings . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2024 , 56 , 817-827 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In the context of carbon neutrality, high efficiency, low carbon, and zero environmental impact have become an essential development direction of internal combustion engines (ICEs). Hydrogen energy has the advantage of having a high calorific value. It also has zero carbon emissions and is considered one of the significant alternative fuels for ICEs. Moreover, ammonia has a high octane number and has an anti-knock effect, which facilitates the mitigation of knock in hydrogen ICEs and potentially mitigates the negative impact of knock on engine volume power. Scholars have carried out some explorations on ammonia-hydrogen ICEs (AHICE), which have been applied in marine power systems. It is anticipated that AHICE will become one of the most significant development directions in the field of vehicle power systems in the future. However, there are still some problems with using AHICEs in passenger cars. The proposed work presented a zero-carbon hybrid power system based on an AHICE. Specifically, the external characteristics curve and power output boundary were obtained by bench experiments of the ICE under wide open throttle (WOT) conditions and diverse engine speeds and lambda. Indeed, a hybrid system model consisting of an AHICE and a power battery was built where the AHICE was used to respond to the demanded power and the power battery was used to provide additional power and store the electrical energy converted from braking. Incidentally, an engine control strategy was developed to expand the knock limit and power boundary by dynamically adjusting the ammonia-hydrogen volume ratio. Finally, a hybrid power system simulation model was established based on MATLAB/Simulink. The CLTC-P and WLTC simulation results demonstrated that the zero-carbon hybrid system which comprised AHICE and power battery can work in the high efficiency area. The AHICE demonstrates lower fuel consumption while satisfying power requirements. This work provides a promising route to zero-carbon hybrid technology for the passenger car industry facing the challenge of carbon neutrality.
关键词 ：
Energy management strategy Energy management strategy ICE ICE Ammonia-hydrogen fuel vehicle Ammonia-hydrogen fuel vehicle Zero-carbon hybrid power system Zero-carbon hybrid power system
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| GB/T 7714 | Ji, Changwei , Xu, Song , Wang, Shuofeng et al. Research on modeling and control strategy of zero-carbon hybrid power system based on the ammonia-hydrogen engine [J]. | ENERGY CONVERSION AND MANAGEMENT , 2024 , 319 . |
| MLA | Ji, Changwei et al. "Research on modeling and control strategy of zero-carbon hybrid power system based on the ammonia-hydrogen engine" . | ENERGY CONVERSION AND MANAGEMENT 319 (2024) . |
| APA | Ji, Changwei , Xu, Song , Wang, Shuofeng , Xin, Gu , Hong, Chen , Qiang, Yanfei et al. Research on modeling and control strategy of zero-carbon hybrid power system based on the ammonia-hydrogen engine . | ENERGY CONVERSION AND MANAGEMENT , 2024 , 319 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Amid growing environmental concerns, hydrogen (H2) is emerging as a prospective alternative fuel for driving internal combustion engines. Employing lean combustion technology in tandem with turbulent jet ignition (TJI) has the potential to enhance combustion rates while mitigating NOx emissions. Therefore, an experiment was developed to investigate the combustion characteristics of ultra-lean premixed H2/air by TJI. An active prechamber (PC) with an additional H2 supply was selected. Moreover, the effect of nozzle structures and equivalence ratio was discussed. The results show that with a nozzle diameter of 3 mm and an elevation of phi PC to 1.4, the lean flammability limit is extended to an equivalence ratio of 0.13, with a consistently stabilized ignition delay within 4 ms. Increasing the nozzle number also extends the lean flammability limit, but it incurs higher energy losses. Additionally, two ignition mechanisms exist in TJI: flame ignition and combined ignition. The transition from flame ignition to combined ignition commonly occurs when the equivalence ratio of the main chamber drops below 0.3. This transition typically results in higher peak pressures and burnt fuel ratio, lower combustion duration, and longer ignition delay.
关键词 ：
Turbulent jet ignition Turbulent jet ignition Active pre-chamber Active pre-chamber Ignition characteristic Ignition characteristic Hydrogen Hydrogen Ignition mechanism Ignition mechanism
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| GB/T 7714 | Zhang, Tianyue , Ji, Changwei , Wang, Zhe et al. Experimental investigation on the combustion characteristics of ultra-lean premixed hydrogen/air using turbulent jet ignition [J]. | ENERGY , 2024 , 293 . |
| MLA | Zhang, Tianyue et al. "Experimental investigation on the combustion characteristics of ultra-lean premixed hydrogen/air using turbulent jet ignition" . | ENERGY 293 (2024) . |
| APA | Zhang, Tianyue , Ji, Changwei , Wang, Zhe , Wang, Shuofeng , Yang, Haowen , Wang, Huaiyu et al. Experimental investigation on the combustion characteristics of ultra-lean premixed hydrogen/air using turbulent jet ignition . | ENERGY , 2024 , 293 . |
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