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The hubless inducer concept is shown in Figure 1 and was first reported in Ref 2. Figure 1 also shows a conventional inducer for direct comparison. The full-flow, hydraulic-turbine-driven inducer boost pump concept is shown in Figure 2 and a working model was first reported in Ref 3. The inducer (hubless or conventional) is driven by a hydraulic turbine, the power being supplied through a rotor connected to the main pumpshaft. The rotor is mounted between the inducer and turbine with all the delivered flow passing through each of the three units, then into the main pump. The inducer-turbine speed is approximately 1/2 to 1/3 that of the rotor, which results in a pumping system that can operate at low suction pressure and high main pumpspeed, satisfying both the design requirements. The engineering drawings of the rotating componentsare presented as Appendix C and are referenced to their corresponding figures in the text. Program tasks were as follows: Original Work Program Task I: Hydrodynamic Design, Mechanism Layout, and Fabrication of a Hubless Inducer; Task II: Inducer Test to Determine Performance Characteristics. The original work plan was terminated and the contract redirected during Task II because the original design specification resulted in inducer and rotor designs that were beyond the state-of-the-art. The revision in the work plan eliminated testing in liquid hydrogen and all subsequent testing was conducted in water, although the hardware was designed for hydrogen operation and could be tested in hydrogen with slight modifications. Revised Work Program Task III: Design, Fabrication and Test of a Conventional Inducer Task IV: Design, Fabrication and Test of a Hubless Inducer Task V: Design, Fabrication and Transient Test of a Hydraulic- Turbine-Driven Inducer Boost Pump Task VI: Comparative Performance Evaluation and Final Report The revised design specifications for the boost pump operating in liquid hydrogen are: Flow rate Boost pump head rise Main pump (rotor) shaft speed Boost pump net positive suction head 25 ft (7.6 m) 4900 gpm (0.309 m3/s) 2000 ft (610 m) 30,000 rpm (3142 rad/sec) {PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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