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takes the remaining whirl out of the flow and passes the turbine flow through three .302 in. diameter holes in each vane. The turbine which drives the inducer was designed as a pure impulse, four stage turbine. The diameter was set at 5.50 in. The high pressure working f l u i d comes from the main pump discharge a t an available head of 2500 f t . Allowing for return line losses the pressure drop across the turbine is 1045 psi for a weight flow of 71 lb/sec (13.608 of the main pump flow). Figure 14 is the estimated performance of the turbine with a velocity ratio of 0.50 and a wxzle spouting angle of 14 degrees. A l l stages are identical and the nozzle exit velocity is 170FPS;the rotor inlet and discharge velocity is 92 FPS. A layodt of the LOX low-speed inducer is shown in Figure 15. From this layout the weight and moment of inertia were calculated to be: Rotor weight, lb = 23.9 Total weight, lb = 125 Moment of inertia, lb-in-sec2 = 0.495 Since a part of the J-2s LOXpump discharge flow is used to drive the low-speed inducer turbine, the operating point of the LOX pump must be increased t o a bigher head and flow t o maintain 265,000 lbs. thrust capability. The new operating point is as follows: Q = 3291 gpm delivered and 13.68 recirculated through the pump and low-speed inducer turbine H = 3031 f t delivered overall head H = 2856 f t across the main pump N= 10,410 rpm re 16 is the actual performance map of the J-2s LOXpump. 8PDF Image | New and Innovative Product
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