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TEST RESULTS 37 drops off a t higher pressure ratios. Though the declining part of the curve is out of the testing range for low inlet qualities and high speeds, the efficiency is leveling off even for these conditions, The decrease in efficiency is due to the asymptotic behaivior of the power at high pressure ratios. The leveling off of power with increasing pressure ratios is accompanied by a continued increase in isentropic enthalpy drop, resulting in decreased efficiency. Variations in efficiency with inlet quality are due entirely t o variations i n leakage fraction and isentropic enthalpy drop. As the leakage fraction decreases with decreasing inlet quality, the efficiency increases. This effect seems to be in effect down to very low inlet qualities where the efficiency begins to level off. The reason for the leveling off can be explained by the sharply increasing fluid density at low inlet qualities. At high qualities, the increase in fluid density with decreasing quality is accompanied by a roughly equivalent decrease in isentopic enthalpy drop[Figure loa]. This results in a relatively constant amount of power available to the engine. At low qualities, a sharp increase in fluid density and mass flow rate is accompanied by only a modest decrease in isentropic enthalpy drop. The power available per volume of fluid at the inlet rises sharply at low inlet qualities with no corresponding increase in power outputCFigure 10bl. This results in decreasing efficiency a t very low exhaust qualities. An increase in efficiency with engine speed is observed at a l l inlet qualities. This can be attributed to the decreased leakage fraction at high speeds. A leveling off of the efficiency at speeds approaching 9000 RPH is caused by the increased frictional losses and the increased power required to accelerate the fluid through the engine. Plots of exhaust quality versus pressure ratio are presented in Figure 11. Exhaust quality does not vary much fron the inlet quality and is thus most dependent on inlet quality. There is very little variation in exhaust quality with speed. The exhaustPDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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