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TESTING LIMITATIONS AND REQUIREMENTS Testing Limitations and Requirements 9 Engine testing was required over a wide range of operating conditions, including the conditions expected for use in the hybrid system. The limiting conditions for engine operation are determined by the steam supply, tha capacity of the exhaust piping, the capacity of the condensate puap and safety considerations. The campus heating system maintains a steam pressure of approximately 125 psia. This pressure varies with the heating load on the system and can drop as low as 120 psia. The pressure which can be maintained at the engine inlet varies with and is somewhat lower than the supply pressure. The highest inlet pressure which could be consistently maintained from day to day was 120 psia. Exhaust pressures were limited by chokingofthe flow in the exhaust piping. The minimum exhaust pressure varied with mass flow rate and thus with engine speed and inlet quality. This pressure was, in some cases, above atmospheric. In the middle of this series of engine tests, the exhaust piping was modified to provide less flow resistance between the engine and separator during staging. This change increased the tortuousness of the exhaust flow path for the Lysholm engine opirtating alone, increasing the minimum exhaust pressure. A t the same time, a new technique was initiated to reduce exhaust pressures. By closing the separator drain and letting the exhaust flow in parallel through the separator and separator bypass, the flow area can be increased and exhaust pressures reduced. This technique allows approximately the same minimum exhaust pressure as before the piping change. Another limitation on the testing range is the capacity. of the condensate pump. The maximum total flow rate which can be handled by the pumpisabout2.3 lbm/sec. Engine testing at high speeds and low qualities is na3e difficult by flooding of the condenser when this l i mi t is exceeded.PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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