Heat recovery bottoming cycles for internal combustion engines have opened new avenues for research into small steamexpanders\n(Stobart andWeerasinghe, 2006). Dependable data for small steam expanders will allow us to predict their suitability as bottoming\ncycle engines and the fuel economy achieved by using them as bottoming cycles. Present paper is based on results of experiments\ncarried out on small scale Wankel and two-stroke reciprocating engines as air expanders and as steam expanders. A test facility\ndeveloped at Sussex used for measurements is comprised of a torque, power and speed measurements, electronic actuation of\nvalves, synchronized data acquisition of pressure, and temperatures of steam and inside of the engines for steam and internal\ncombustion cycles. Results are presented for four engine modes, namely, reciprocating engine in uniflow steam expansion mode\nand air expansionmode and rotaryWankel engine in steamexpansionmode and air expansionmode.Theair tests will provide base\ndata for friction and motoring effects whereas steam tests will tell how effective the engines will be in this mode. Results for power,\ntorque, and
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