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d II. INTRODUCTION There are two major requisites to the high efficiency that will be required for pumping systems for future rocket engines: (i) high pump shaft speed to reduce turbopump weight, and (2) a low operating pump suction pressure to reduce propellant tank weights. In the design of a pump these two require- ments have a direct effect on each other. That is, the lower the pump suction pressure, the lower the shaft speed must be to avoid cavitation and, conversely, the higher the pump speed, the higher the suction pressure must be to avoid cavitation. There are two ways that this design problem can be eliminated. The first is to develop high speed pump inducers that can operate at low inlet suction pressures. The second is to provide the main high speed pump with higher pressure delivered from a boost pump. Several boost pump concepts available to accomplish this objective are described in Ref i. The purpose of the work performed under this contract was to compare tile performance of a hubless inducer with that of a conventional inducer in both cavitating and non-cavitating steady-state operation. Both inducers were then tested in a full-flow, hydraulic-turbine-driven inducer boost pump to demonstrate the performance of this concept for advanced boost pump application. I. SUMMARY Pump cavitation in high speed turbomachinery is a major design considera- tion. Cavitation can be controlled by high suction performance inducers and/or by a boost pump located upstream of the main pump. A hubless inducer was designed and tested and the performance compared to that of a similar conventional inducer. The suction performance of the hubless inducer was not significantly better than that of the conventional inducer after accounting for the larger inlet tip blade angle. Per established theory, inducers with larger inlet tip blade angles will have higher suction performance. The hub less inducer concept does, however, allow inducers with larger blade angles to be manufactured. Hubless inducers can best be used when the available drive power is at the outer shroud. The full flow hydraulic turbine drive boost pump shows potential for use with high speed pumps. It has the ability to start very quickly and maintain an almost constant speed ratio over the entire flow speed range. The performance limiting component was the high speed rotor, which cavitated more than was expected. The rotor configuration is limited by overall boost pump requirements, but there are several possible design approaches to reduce rotor cavitation. During preliminary design selection of a pumping system, a boost pump of this type should be considered, if any of the following criteria must be met: i. Fast starts 2. No additional gears 3. No recirculating flow 4. 5. Constant speed ratio Comparable high efficiencyPDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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