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This is an analysis of the effects of the volumetric expansion ratio on the operation of a Lysholm helical screw expander. Extensive testing of the University of California Lysholm engine with a 5.3 volumetric expansion ratio was a 5.0 pressure ratio and at a variety of speeds and pressure ratios for 99 percent quality. It was predicted that decreasing the volumetric expan- sion ratio would decrease the leakage fraction and thereby performed by Karl Brown1 and Ralph Berger' the expansion ratio has been reduced from 5.3 to 4.0. Tests were performed at a variety of speeds and qualities for increase efficiency. efficiency increased steam and 16 percent an inlet pressure of Amaximum efficiency This occurred as predicted. Isentropic 20 percent for 50 percent quality for 33 percent quality steam, all for 120 psia and a speed of 9000 rpm. of 47.2 percent was reachedat33 percent It was noted quality, 9000 rpm and a pressure ratio of 5.0. that the leakage rate did not appear to be a function of Using this fact the previous empirical modelsof the engine were extended to expansion r a t i o , as had been expected. include volumetric expansion ratio as a variable parameter. ._ .. ".' . . . . ' In this experiment, , J ,.PDF Image | Expansion Ratio of a Lysholm Screw Expander
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