The　compressed　air-powered　system　is　widely　studied　as　a　promising,　environment-friendly,　and　high　efficiency　technology.　The　influences　of　centrifugal　and　filter　oil-gas　separator　on　the　performance　of　single　screw　expanders　for　compressed　air-powered　systems　are　experimentally　investigated.　Results　show　that　the　intake　volume　flow　rate　using　the　centrifugal　oil-gas　separator　is　lower　than　that　of　the　filter　oil-gas　separator.　Meanwhile,　the　temperature　difference　between　the　inlet　and　outlet　of　a　single　screw　expander,　the　average　output　power,　and　the　average　shaft　efficiency　by　using　the　centrifugal　oil　gas　separator　is　1.88,　1.67,　and　1.42　times　higher　than　that　of　the　filter　oil-gas　separator　under　the　same　working　condition　in　this　study.　The　maximum　expansion　ratio　in　this　work　is　8.5　by　using　the　centrifugal　oil-gas　separator.　The　actual　total　output　power,　effective　working　time,　and　exergy　efficiency　by　using　the　centrifugal　oil-gas　separator　are　respectively　56.67%,　4.51%,　and　92.52%　substantially　higher　than　that　of　the　filter　oil-gas　separator.　The　performance　of　single　screw　expanders　in　compressed　air　powered　systems　can　be　improved　by　using　the　centrifugal　oil-gas　separator.　(c)　2021　Elsevier　Ltd.　All　rights　reserved.