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i. Inducer The inducer speed was set to be consistent with the cavitation model of the high speed rotor. A speed ratio of 2.14 and an inducer discharge mean line head coe-ficient of approximately 0.35 were selected. This results in a speed of 14,000 rpm (1470 rad/s) and head rise of 1700 ft (518 m). Since the inducer inlet geometry was fixed by the pump test fixture at a diameter of 7.72 in. (0.196 m), the inlet flow coefficient was 0.085 (0.071 for hubless). The inducer work split analysis and Inlet Tip Diameter Inlet Hub Diameter following inducer parameters were set by the are consistent with those of Ref 13. Discharge Tip Diameter Discharge Hub Diameter Inlet Tip Flow Coefficient Discharge Tip Flow Coefficient Discharge Mean Head Coefficient 0.288 7.72 0 7.142 5.714 0.071 0.250 0.288 Speed Flow 14,000 rpm (1470 rad/s) 4,900 gpm (0.309 m3/s) 14,000 rpm (1470 r_d/s) 4,900 gpm (0.309 m3/s) 18 2. Rotor Conventional 7.72 in (0.196 m) 3.09 in (0.0784 m) 7.142 in (0.181 m) 5.714 in (0.143 m) 0.085 0.250 Hubless in (0.196 m) in (0,181 m) in (0.143 m) The rotor inlet and discharge flow annulus was maintained the same as the inducer discharge. The flow discharging for the inducer was assumed to have the same properties at the rotor inlet since there were no radii change. This annulus had previously been sized to prevent rotor cavitation and, there- fore, only blade loading needed consideration. Figure 12 shows the one-dimensional rotor diffusion factor as a function of speed ratio and inducer head coefficient. Also shown is rotor mean head rise coefficient as a function of the same variable. At the selected operating point, the rotor diffuser factor will be 0.27 and the head rise coefficient 0.16. These values are consistant with those given in Ref 5. The design parameters based on the one-dimensional analysis for the high speed rotor are given below but were subject to change based on test results from the inducer. Tip Diameter 7.142 in (0.181 m) Hub Diameter 5.714 in (0.143 m) 0.117 Mean Head Coefficient Rise 0.16 Speed 30,000 rpm (3142 rad/s) Flow 4,900 gpm (0.309 m3/s) Tip Flow Coefficient rr1!1PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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