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学者姓名：纪常伟
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摘要 ：
This paper aims to predict the intake characteristics of a side-ported Wankel rotary engine implemented by a novel dual-layer machine learning (ML) structure. The Sobol sequence coupled with a parametric phase control model is performed to generate samples using a three-dimensional dynamic simulation model. Two ML structures are compared to determine the input features, in which the input features of structure A are the port phases, while structure B also contains the geometric features. Compared with Structure A, the regression and generalization abilities of Structure B with different ML methods are generally favorable. Based on structure B, a novel dual-layer structure prediction model is developed using the Gaussian process regression method in which geometric features are used as intermediate variables. The results show that for the prediction of intake loss and volumetric efficiency, the coefficients of determination are greater than 0.99, and the prediction error is less than 1%. In addition, the port full closing timing determines the intake characteristics compared with other port phases. This paper provides novel solutions for predicting intake characteristics to guide practical optimization.(c) 2022 Elsevier Masson SAS. All rights reserved.
关键词 ：
Intake characteristics Intake characteristics Wankel rotary engine Wankel rotary engine Machine learning Machine learning
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| GB/T 7714 | Wang, Huaiyu , Ji, Changwei , Yang, Jinxin et al. Implementation of a novel dual-layer machine learning structure for predicting the intake characteristics of a side-ported Wankel rotary engine [J]. | AEROSPACE SCIENCE AND TECHNOLOGY , 2023 , 132 . |
| MLA | Wang, Huaiyu et al. "Implementation of a novel dual-layer machine learning structure for predicting the intake characteristics of a side-ported Wankel rotary engine" . | AEROSPACE SCIENCE AND TECHNOLOGY 132 (2023) . |
| APA | Wang, Huaiyu , Ji, Changwei , Yang, Jinxin , Ge, Yunshan , Wang, Shuofeng . Implementation of a novel dual-layer machine learning structure for predicting the intake characteristics of a side-ported Wankel rotary engine . | AEROSPACE SCIENCE AND TECHNOLOGY , 2023 , 132 . |
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摘要 ：
In this study, a double spark plugs direct injection rotary engine is used to investigate the effects of synchronous and asynchronous changes of ignition timing on combustion and emission performance. The three-dimensional dynamic model was established by CONVERGE software and validated by the experimental data. The results indicate that setting the fuel injector toward the spark plug can reduce the fuel distribution at the tail of the combustion chamber, and the in-cylinder mixture inhomogeneity index gradually increases with the advance of the ignition timing. Compared with the synchronous change of ignition timing, advancing the ignition timing of the tailing spark plug can promote the combustion process. When the ignition timing of the leading spark plug is too early, the flame front will be irregular. With the advance of ignition timing, CA 0-10 corresponding to synchronous and asynchronous change all gradually increase, and the change of CA 10-90 is more stable than that of CA 0-10. Whether the ignition timing is changed synchronously or asynchronously, with the advance of the ignition time, the in-cylinder pressure shows an upward trend. The mean in-cylinder pressure corresponding to the synchronous change with the same change amplitude is slightly higher than that of asynchronous change. The peak pressure of 16.4% higher than that of the original engine can be obtained by adopting the ignition strategy of the synchronous advance of 30 degrees CA. Under this ignition strategy, the temperature and NOx mole fraction in the combustion chamber are all the lowest.
关键词 ：
Double spark plugs Double spark plugs Ignition timing Ignition timing Direct injection Direct injection Synchronous and asynchronous Synchronous and asynchronous
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| GB/T 7714 | Chang, Ke , Ji, Changwei , Wang, Shuofeng et al. Numerical investigation of the synchronous and asynchronous changes of ignition timing in a double spark plugs direct injection rotary engine [J]. | ENERGY , 2023 , 268 . |
| MLA | Chang, Ke et al. "Numerical investigation of the synchronous and asynchronous changes of ignition timing in a double spark plugs direct injection rotary engine" . | ENERGY 268 (2023) . |
| APA | Chang, Ke , Ji, Changwei , Wang, Shuofeng , Yang, Jinxin , Wang, Huaiyu , Meng, Hao et al. Numerical investigation of the synchronous and asynchronous changes of ignition timing in a double spark plugs direct injection rotary engine . | ENERGY , 2023 , 268 . |
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摘要 ：
The Wankel rotary engine (WRE) is widely used in the fields of unmanned aerial vehicles and range extenders due to its superior power-to-weight ratio. However, the rotor piston bears an intense thermal load during operation. This study focuses on the implementation of the coupled 1D-3D model. The influence of ECFs on WRE performance characteristics and emissions and improving WRE performance characteristics and emissions at different operating parameters (speeds and hydrogen enrichment) with ECFs are studied. The simulation results demonstrated that radial-fins have a more significant effect, reducing the fire-face's average temperature by 49.03 K and increasing the in-cylinder mass by 6.4 %. Compared with no-fins, radial-fins can increase pressure by 4.4 % and HRR by 5.6 %. At the same time, the NOx is reduced by 15.60 %, and the CO is slightly increased by 0.93 %. At different speeds, the ECF structure can improve the engine performance. The ECFs are more evident at low speeds, which can increase the indicated power by 3.13 % compared with the original engine. Compared with the gasoline-fueled WREs, using radial-fins can lead to more apparent performance improvement for hydrogen-enriched WREs. This paper will provide insight into the feasibility of ECF configuration to improve the performance of WREs in engineering applications.
关键词 ：
Enhanced cooling fins Enhanced cooling fins Performance and emissions Performance and emissions Hydrogen-enriched Hydrogen-enriched Wankel rotary engine Wankel rotary engine Thermal load Thermal load
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| GB/T 7714 | Ji, Changwei , Huang, Xionghui , Yang, Zhengyu et al. Potential improvement in performance and emissions of air-cooled rotary engine using novel enhanced cooling fins [J]. | FUEL , 2023 , 334 . |
| MLA | Ji, Changwei et al. "Potential improvement in performance and emissions of air-cooled rotary engine using novel enhanced cooling fins" . | FUEL 334 (2023) . |
| APA | Ji, Changwei , Huang, Xionghui , Yang, Zhengyu , Yang, Jinxin , Wang, Shuofeng . Potential improvement in performance and emissions of air-cooled rotary engine using novel enhanced cooling fins . | FUEL , 2023 , 334 . |
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摘要 ：
Hydrogen is regarded as one of the most potential alternatives for high-efficiency and eco-friendly combustion. The influences of hydrogen fractions and equivalence ratios on chamber pressure, combustion phases, wall heat loss, brake thermal efficiency, and cyclic fluctuation of Wankel engines were studied by testbench measurement. The intrinsic mechanisms of these effects were analyzed through numerical investigation. Results indicated that increasing hydrogen fraction increased the mass fraction of high-temperature regions, the timings taken for formations of intermediate products were advanced, and the peak H2O2 and CH2O reduced while OH concen-tration increased. These factors were responsible for increased chamber pressure and the shortened flame development and propagation periods in experiments. A close inverse relationship can be drawn between the wall heat loss and brake thermal efficiency with respect to hydrogen addition. A larger hydrogen fraction coupled with a smaller equivalence ratio manifested lower wall heat loss and higher thermal efficiency. Compared with hydrogen-free regimes, brake thermal efficiency of 6% hydrogen fraction was increased by 64.6%. There was a positive proportional correspondence between the initial flame development and cycle-to-cycle fluctuation. Increasing the hydrogen content caused the enhanced turbulent intensity during the initial combustion stage, which contributed to the stability improvement of engine operations.
关键词 ：
Hydrogen Hydrogen Wankel engine Wankel engine Numerical simulation Numerical simulation Equivalent ratio Equivalent ratio Combustion Combustion
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| GB/T 7714 | Shi, Cheng , Chai, Sen , Di, Liming et al. Combined experimental-numerical analysis of hydrogen as a combustion enhancer applied to wankel engine [J]. | ENERGY , 2023 , 263 . |
| MLA | Shi, Cheng et al. "Combined experimental-numerical analysis of hydrogen as a combustion enhancer applied to wankel engine" . | ENERGY 263 (2023) . |
| APA | Shi, Cheng , Chai, Sen , Di, Liming , Ji, Changwei , Ge, Yunshan , Wang, Huaiyu . Combined experimental-numerical analysis of hydrogen as a combustion enhancer applied to wankel engine . | ENERGY , 2023 , 263 . |
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摘要 ：
本发明设计了一种面向增程器应用的零碳燃料转子机及控制方法。具体涉及一种根据电动汽车电池电量和汽车负荷率调节氨氢转子机运行的控制方法。本发明以电动汽车电池电量传感器输出信号为根据，判断电动汽车的电池电量，来控制增程器用氨氢转子机的运转状况，同时，根据汽车的负荷率输出信号到转子机电子节气门、氨气喷嘴和氢气喷嘴，控制燃料的喷射油量，合理改变氢气和氨气的供给策略，使氨‑氢‑空混合气在当量比为1的情况下燃烧，保证转子机运行的经济性，实现转子机在零碳排放的前提下为电动汽车电池充电，增加电动汽车的续航里程。
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| GB/T 7714 | 汪硕峰 , 孙禹 , 纪常伟 et al. 一种面向增程器应用的零碳燃料转子机及控制方法 : CN202310709343.4[P]. | 2023-06-15 . |
| MLA | 汪硕峰 et al. "一种面向增程器应用的零碳燃料转子机及控制方法" : CN202310709343.4. | 2023-06-15 . |
| APA | 汪硕峰 , 孙禹 , 纪常伟 , 杨金鑫 , 王怀宇 . 一种面向增程器应用的零碳燃料转子机及控制方法 : CN202310709343.4. | 2023-06-15 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明提出一种氨内燃机及控制方法，具体涉及到一种利用加热装置系统通过对氨燃料加热实现氨内燃机混合燃烧及控制方法，目的是实现高压缩比的氨内燃机的正常燃烧，同时对尾气余热能量进行回收。主要包括进气系统、氢气供给系统、氨气供给系统、氨气加热系统和控制系统。其优点是不同工况下，选择不同加热模式，对氨燃料进行加热，使氨燃料以较高的温度进入缸内，避免氨内燃机着火困难，点火延迟增加以及燃烧速度慢等问题。本发明可以实现高压缩比的氨内燃机的正常燃烧，同时对尾气余热能量进行回收，具有良好的发展前景。
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| GB/T 7714 | 纪常伟 , 强艳飞 , 汪硕峰 et al. 一种氨内燃机及控制方法 : CN202310527586.6[P]. | 2023-05-11 . |
| MLA | 纪常伟 et al. "一种氨内燃机及控制方法" : CN202310527586.6. | 2023-05-11 . |
| APA | 纪常伟 , 强艳飞 , 汪硕峰 , 辛固 , 洪琛 , 杨金鑫 . 一种氨内燃机及控制方法 : CN202310527586.6. | 2023-05-11 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明设计了一种采用扩散燃烧的涡流室式氢转子机及控制方法，具体涉及一种转子机氢气直喷入涡流室内实现扩散燃烧的结构优化以及控制方法，以实现氢转子机的良好性能。本发明通过采用涡流室的结构以及扩散燃烧的方法，实现点火强化和漏气降低。同时，通过采用扩散燃烧的方式克服了传统转子机火花塞点火带来的燃烧缓慢且不完全的问题，并减少氢气的壁面传热损失，实现氢转子机的良好性能。另外，通过采用涡流室内直喷氢气，可减少氢转子机中出现的回火、早燃等异常燃烧现象，以实现氢转子机的良好性能。
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| GB/T 7714 | 纪常伟 , 吴事凡 , 杨金鑫 et al. 一种采用扩散燃烧的涡流室式氢转子机及控制方法 : CN202310709699.8[P]. | 2023-06-15 . |
| MLA | 纪常伟 et al. "一种采用扩散燃烧的涡流室式氢转子机及控制方法" : CN202310709699.8. | 2023-06-15 . |
| APA | 纪常伟 , 吴事凡 , 杨金鑫 , 汪硕峰 , 孟昊 . 一种采用扩散燃烧的涡流室式氢转子机及控制方法 : CN202310709699.8. | 2023-06-15 . |
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摘要 ：
本发明提出一种氨氢内燃机及控制方法，对尾气余热能量进行回收，同时实现安全可靠的燃料供给并降低氢燃料的异常燃烧从而实现高功率和高效率。包括进气系统、预储氢气供给系统、液油储氢供给系统、蓄压式储氨(液氨)供给系统和控制系统。其优点是可以利用内燃机尾气余热为氢油储氢系统提供热量，分解产生氢燃料。而蓄压式储氨(液氨)系统具有稳定的工作压力，可以使氨燃料以液氨的形式与氢燃料进行混合燃烧，其较大的汽化潜热可以克服氢内燃机的异常燃烧，较大的体积能量密度也会增加内燃机的动力性能。该内燃机及控制方法可以实现安全可靠的燃料供给并降低氢燃料的异常燃烧，具有良好的发展前景。
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| GB/T 7714 | 纪常伟 , 强艳飞 , 汪硕峰 et al. 一种氨氢内燃机及控制方法 : CN202310527600.2[P]. | 2023-05-11 . |
| MLA | 纪常伟 et al. "一种氨氢内燃机及控制方法" : CN202310527600.2. | 2023-05-11 . |
| APA | 纪常伟 , 强艳飞 , 汪硕峰 , 辛固 , 洪琛 , 杨金鑫 . 一种氨氢内燃机及控制方法 : CN202310527600.2. | 2023-05-11 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明设计了一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法，属于发动机领域，具体涉及一种根据发动机转速，通过调节冷风风扇流量大小来控制氢气的进气温度的控制策略。本发明根据转速、冷却介质温差和流量、液氢前后温差与流量的输出信号为依据，将发动机转速划分为三个区间，通过冷却风扇来调节不同转速下氢气的进气温度，利用其低温及汽化潜热的特性来抑制发动机回火、爆震和异常燃烧现象发生。
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| GB/T 7714 | 纪常伟 , 史梦圆 , 汪硕峰 et al. 一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法 : CN202310307595.4[P]. | 2023-03-28 . |
| MLA | 纪常伟 et al. "一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法" : CN202310307595.4. | 2023-03-28 . |
| APA | 纪常伟 , 史梦圆 , 汪硕峰 , 杨金鑫 . 一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法 : CN202310307595.4. | 2023-03-28 . |
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摘要 ：
As a promising power system, hydrogen-fueled Wankel rotary engine with excellent power and emission characteristic have received attention increasingly, which makes it of great interest to investigate it. To make up for blanks, this work was conducted to experimentally investigate the effect of spark plug position on the combustion and emission characteristic of hydrogen-fueled Wankel rotary engine under 1500 r/min, 66 kPa manifold absolute pressure and 1.5 excess air ratio. The results indicate that compared to the trailing spark plug, the leading spark plug is more suitable to hydrogen-fueled Wankel rotary engines, which can realize a wider ignition range, higher maximum brake torque, lower cyclic variation and better nitric oxide emission. The maximum brake torque of adopting trailing spark plug is 31.2 N.m, which is only 87% of the maximum brake torque of 36.0 N.m with adopting leading spark plug. At the maximum brake torque ignition timing, adopting leading trailing spark plug achieves lower cyclic variation and slightly higher thermal load than adopting trailing spark plug. Besides, the optimum central heat-release point of both spark plug positions locate between 35 and 40 degrees CA after the top dead center, and that of leading spark plug is later 2 degrees CA than that of trailing spark plug. Moreover, both spark plug positions obtained 0 nitric oxide emission at maximum brake torque ignition timing, which means that emission will not be a problem to limit the selection of spark plug position under tested conditions.
关键词 ：
Wankel rotary engine Wankel rotary engine Emission Emission Hydrogen Hydrogen Combustion Combustion Spark plug position Spark plug position
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| GB/T 7714 | Yang, Jinxin , Meng, Hao , Ji, Changwei et al. Comparatively investigating the leading and trailing spark plug on the hydrogen rotary engine [J]. | FUEL , 2022 , 308 . |
| MLA | Yang, Jinxin et al. "Comparatively investigating the leading and trailing spark plug on the hydrogen rotary engine" . | FUEL 308 (2022) . |
| APA | Yang, Jinxin , Meng, Hao , Ji, Changwei , Wang, Shuofeng . Comparatively investigating the leading and trailing spark plug on the hydrogen rotary engine . | FUEL , 2022 , 308 . |
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