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6. The full flow hydraulic turbine driven inducer boost pump in the configuration shown in Figure 2 has the following characteristics: Maximum speed ratio of 2.5 limited by the cavitation per- formance of the rotor. The speed ratio has nearly the same value as the design from 0 to 120% of the design flow coefficient. The boost pump has the capability of start transient times less than 1 second. Successful start transients can be realized even through a high degree of rotor cavitation exists at some point during the transient. These transients, however, require a longer elapsed time. 7. Rotor cavitation performance appears to be somewhat a function of h_b/tip diameter ratio as shown by Figure 73. If this indication is correct, cavitation performance is limited and can be improved to the required 7420 (2.7) suction specific speed only by decreasing the hub/tip diameter ratio. This of course affects the complete design of the boost pump and may impose other restrictions. 8. Blade row head rise performance across the discharge passage can be successfully measured by the use of fixed-position Kiel probes. Care must be taken to set probes so that the required flow range can be met. 9. Shroud drag calculated by standard disk friction procedures was in error by 25% to 40%. This could be partially caused by larger than normal clearances or by pumping action through the radial thrust bearings. i0. Full flow hydraulic turbine driven inducer boost pumps similar to the concept shown in Figure 74 are not speed ratio limited at 2.5 but can be designed for speed ratios as high as 4. The disadvantages are a high speed shroud coupling and return flow into the inlet of the high speed inducer. All hydraulic components are within the state-of-the-art. 99PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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