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TEST RESULTS 31 Test Results Engine testing to f i l l the desired data matrix produced 104 data points having an inlet pressure of 120 psia. The data were reduced using the computer codes developed for this project. Trends in mass flow rate, power, efficiency and exhaust quality were examined. As expected, mass flow rate increased with engine decreased with increasing exhaust quality. The flow not vary much with exhaust pressure, dropping off only at high exhaust pressures. Power increased with ratio, approaching an asymptote at very high pressure speed and rate did slightly pressure ratios. The power also increased with speed, leveling off slightly a t the highest speed. Efficiency data reflected the combined effects of power and mass flow rate. A peak was observed in efficiency with varying pressure ratio. The efficiency also appeared to approach a peak with increasing engine speed and decreasing inlet quality. The exhaust quality was most heavily dependent on inlet quality and independent of speed. The variation in exhaust quality with pressure ratio was dependent on the inlet quality. The test results are tabulated in Tables 2a-2e. Included in the listing is a specification of the operating conditions for each data point and the calculated performance paraxeters. Also listed are the run date, run number, calibration code, barometric pressure and comment code. A listing of the meanings of the comment codes is presented in Table 3. Mass flow rate for all data points is plotted in Figures 4a-4e. The most important trend apparent in these plots is the lack of variation in mass flow rate with pressure ratio. Mass flow rate can be divided into two parts, the theoretical flow rate and the leakage rate. Both of these flow rates are determined entirely at the inlet, The theoretical flow rate, the flow rate with no leakage, is dependent entirely on the volume of the inlet chanber upon closing, the speed and the inlet quality. It is independent of exhaust pressure. The leakage rate, the difference betwsen the total flow rate and the \ , . .- . .. _.__ "_.I_.. .. ,PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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