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It is essential, in evaluating these re- sults, to remember that they describe the performance characteristics of a Lysholm engine running on a mixture of water and steam. The performance of a Lysholm compressor is well documented. Adiabatic compressor efficiency or engine efficiency, the fundamental meas- ure of performance, has been typically reported as a function of pressure ratio.7 Similarly, as an expander using a gas, e.g., a argon or helium, as the working fluid, performance has been related to pressure ratio.3 The same treatment might therefore seem appropriate to characterize the performance of the Lysholm engine using geothermal fluid as a working medium. In these tests the working fluid is a Only two test points were taken nominally at 2000rpm, and these were discarded as insufficient data. The test points at 2425, 3162, 3556, 4212, and4837rpm were arbitrarily excluded be- cause they were too far removed from any nominal speed. The largest devi- ation accepted was 132 rpm for test 3-11/4-8. Four other tests, 4-1/4-8,4-7/4-8, 3-7/4-10,and 3-8/4-10were also dis- carded. The inlet enthalpy for these runs did not match the inlet enthalpy for other runs at that same heater setting. Evidently, the state conditions were not maintained, since the state temperatures T1and the mixture quality do not correspond. This leaves 49 data points that are reported in Tables 1, 2, and 3. Raw data for all 60runs are included in Tables4and 5. are known. For a steam engine, per- formance is measured in terms of engine efficiency, thermal efficiency, and water rate, i. e. , the flow necessary to generate1kWofpower, asfunctionsof power output. Measuringthese quantities as functions of power output also seems appropriate for the Lysholm engine. Ingroupingthedataforanalysis, what variable should be constant: inlet pres- sure, inlet enthalpy, speed, or pressure ratio? The speed of the output shaft was selected, and on that basis, seven test points were excluded from the analysis. bines all three speeds and shows that thermal efficiency is, for all practical purposes, independent of speed. These test results show a maximum engine efficiencyof49%at16kWfor3000rpm, 5370at23kW for4000rpm, and5570at 30 kW for 5000rpm. Results L steam-water mixture with a quality of 15-3570,not a gas. It is not obvious that performance would be clearly related to pressure ratio. No performance char- acteristics for any engine using a range of low-quality mixtures as working fluids 5000 rpm, respectively. Figure 9 com- -10- Figures 6-9show thermal efficiency and engine efficiency vs output power, for output shaft speeds of 3000,4000and Figures 10-12repeat Figures 6-8, but . asafunctionofpressureratioP,/P 2 3' Performance over much of the speed range is in excess of 5070for pressure ratios as high as 5:l. The flatness of the engine efficiency characteristic with respect to speed andPDF Image | PERFORMANC€ TEST OF A LYSHOLM ENGINE
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