PERFORMANC€ TEST OF A LYSHOLM ENGINE

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PERFORMANC€ TEST OF A LYSHOLM ENGINE ( performanc€-test-lysholm-engine )

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Vx (u .- C V c 0- W 60I II II I An 3000 rprn - Fig. 6. Power - kW Thermal and engine efficiencies vs power output at 3000rpm. power output and pressure ratio has been exhibited by all Lysholm engines and compressors. This is due to the fact that leakage effects decrease with increased speed, while throttling and other dynamic losses increase with higher speed. These losses counterbalance each other to a certain extent. A flat performance char- acteristic is advantageous inasmuch as it means that although the engine is designed for optimum performance at one pressure ratio, its behavior under other than design conditions is good.2,387 Figure 13 shows water rate as a func- tion of power. Note that the performance is a characteristic of the engine and is also, for all practical purposes, inde- pendent of speed. The lowest water rate measured was 173lb/kW-hr, which is entirely reasonable, considering that this is an experimental engine running with a very small enthalpy drop. An attempt was made to characterize -11- the leakage through the engine by measur- ingflow rates at various angular positions of the locked rotors. No conclusions about the effect of leakage-on performance could be drawn. The tests in the laboratory were per- formed with clean water. Inspection of the rotors after testing indicated that much of the scale built up during the earlier operation of the engine at Cerro Prieto and East Mesa had been removed, I

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