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SYSTEM WITHOUT LOWSPEED INDUCER Model results for low NPSP performance of the engine without the low-speed inducer were obtained to establish a reference for evaluat- ing the results of the system with a low-speed inducer. To establish the steady state and start reference performance two types of runs were made. These were: (1) Reduction of NPSP with the engine running at nominal performance and (2)starts at low NPSP. The limit for low NPSP operation is determined by the fuel pump cavitation per- formance. Referring t o figure 20 the ratio of actual t o non- cavitating head is dependent on the ratio of net positive suctioc head t o speed squared. As a result, the lower the speed, the lower the required NPSP t o maintain pump performance. For steady state performance, the computer model engine was started with a fuel pump NPSP of 10 psi (approximately 345 feet of hydrogen). From this point, the NPSP was reduced until oscillations due to deep cavitation occurred. As the NPSP was reduced, the fuel pump dis- charge pressure, fuel flowrate and chamber pressure decreased due to increasing cavitation while the fuel pump speed increased due to the fuel pump requiring less power. Severe oscillations accurred when the NPSP was reduced below 3.5 psi (approximately 120 feet). The results are shown in Figure 21, The results for starting from low (3.5 psi) NPSP, shown in Figures 22 and23 : indicate that the engine will start at a tank pressure that results in minimum running NPSP. The only apparent difference between 10 and 3.5 psi NPSP is a lower minimum fuel pump flow coef- ficient for the low NPSP condition. The minimum flow coefficient is about 0.8 of the nominal NPSP minimum value due to a lower initial fuel flowrate under the low tank pressure condition.PDF Image | New and Innovative Product
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