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HYDRODYNAMIC DESIGN OF LOW-SPEED INDUCERS OPERATING REQUIREMENTS Tbe operating requirements f o r the LOX and LH2 lowaspeed inducers were assumed to be the same as those experienced during a typical Apollo vehicle flight. Actual flight data from Apollo 8, 9, and 10 were analyzed f o r t h i s purpose. (These datawere obtained from Rocketdyne Flight Telemetry Data Files and published NASA Flight Evaluation Reports.) Based on t h i s data analysis, parameters, such as speed, flow, inlet pressure, and tank ullage pressure for the LOX and LE2 turbopumps from the S-I1 and S-IVB stages were established. Without conventional tank pressurization being used on these stages, the net positive suction head (NPSH) then would be the difference between the total inlet head at the turbopump and the pressure above the fluid in the tank. This NPSH is plotted as a function of flight time in Figure 1. The data- presented in the form of data envelopes due t o considerable scatter in the telemetry data. The following table presents available NPSH without tank pressurization and main pump required NPSH for the Saturn S-11 and S-IVB stages: * Does suppression .effects.. Stage Turbopume s-I1 Fue1 LOX .s-IVB Fue1 LOX not include thermodynamic Available NPSH-Ft Minimum Main Pump Required NPSH 90 35 26 -65* 6 - 15 6 -27* 5-9 35 90 7PDF Image | New and Innovative Product
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