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TEST RESULTS 35 during expansion, there is a slightly greater pressure drop during expansion for higher inlet qualities. Leakage would tend t o decrease t h e pressure drop during expansion by equalizing the chamber pressures. The leakage fraction is the pertinent paramenter to consider because it represents the aaount of leakage relative to the amount of fluid in a chamber. The leakage fraction and thus the pressure equalization is greater for higher inlet qualities. The small variations in K and in leakage appear to negate each other producing a power output effectively independent of inlet quality. Although power appears to be independent of inlet quality, utilization of the total flow from the wellhead is still desirable. Examination of mass flow rate data[Table 21 reveals that for a given speed, increasing inlet quality decreases the required mass flow rate of steam. Thus,.for a given speed and pressure ratio, decreasing inlet quality reduces the amount of stearn required t o produce the same amount of power. In addition, the expansion of the water phase in the engine makes more steam available for use by the second stage of a hybrid system. The power increase with speed is due t o the increased mass flow rate. This trend startsto level off by 9000 RPM with a peak probably occurring at higher speeds. This leveling off is due to the losses associated with drag, required acceleration of the fluid and bearing friction. The power increases with pressure ratio from an output of zero at some mimimum pressure ratio required to turn the engine with no load. The power appears to reach a maximum value at very high pressure ratios. This asymptotic behaivior can be explained by exmining the effects of exhaust pressure on leakage and on the power required to expel fluid from the engine. Ideal isentropic expansion would be independent of the back pressure. The pressure in a chamber just before it opens to the exhaust would not be affected by t h e exhaust pressure. \ When t h i sPDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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