Proceedings Article10.2514/6.1992-3133
Hydraulic and mechanical performance of LE-7 LOX pump inducer
Kenjiro Kamijo,Makoto Yoshida,Yoshinobu Tsujimoto +2 more
- 06 Jul 1992
133
TL;DR: In this paper, a liquid oxygen turbopump has been developed for the main engine (LE-7) of the H-II rocket, which is the next generation of Japanese launch vehicle.
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Abstract: A liquid oxygen turbopump has been developed for the main engine (LE-7) of the H-II rocket. The LE-7 LOX pump requires an inducer with quite high suction performance and high head, because a low-speed and low-pressure pump is not used ahead of the main pump in the LE-7 engine. The inducer was designed using the customary method, and its hydraulic and mechanical performances were investigated in tests of LE-7 LOX turbopumps. The original combination of an inducer and an inducer housing satisfied the required hydraulic performance criteria. However, this combination was found to result in supersynchronous shaft vibrations due to rotating cavitation which occurred in the inducer. This problem was almost completely solved by a simple modification of the inducer upstream housing. Furthermore, the rotating cavitation of the present inducer was investigated using a new theory of such cavitation. I. Introduction A LIQUID oxygen turbopump has been developed for the main engine (LE-7) of the H-II rocket, the next generation of Japanese launch vehicle. This turbopump requires a high-flow, high-pressure liquid oxygen pump. Because a low-speed, low-pressure pump is not used ahead of the main pump in the LE-7 engine, it is very important to operate the main pump at higher speed to obtain a smaller-size, lighterweight turbopump. The operational speed of the present turbopump was restricted by the suction performance of the main pump inducer. In this article, we report both the design and test results of the inducer. The main pump of the LE-7 LOX turbopump has a singlestage centrifugal impeller with an inducer. 1 The inducer is characterized by a low flow coefficient, a small inlet angle, a sharp leading edge, etc., to achieve higher suction performance. The inducer was designed using the customary method.2-3
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A Theoretical Analysis of Rotating Cavitation in Inducers
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Pump as turbine cavitation performance for both conventional and reverse operating modes: A review
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Experimental Study on Rotating Cavitation of Rocket Propellant Pump Inducers
TL;DR: In this article, a simple modie cation of the inducer upstream housing almost completely extinguished the shaft vibrations caused by rotating cavitation in a liquid oxygen (LOX) turbopump for the H-II rocket.
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References
•Book Chapter
An Experimental Study of Cavitating Inducers
Allan J. Acosta
- 01 Aug 1958
TL;DR: In this article, it was shown that cavitation effects in the production of lift by a turbo machine are relatively unimportant whereas dissipation is important in the decrease of energy of a fluid stream as in the case of a pump.
90
Experimental investigations of hydrodynamically induced shaft forces with a three bladed inducer.
W. Rosenmann
- 01 Jan 1965
TL;DR: Shaft deflections in turbopumps from cavitation induced unbalanced hydrodynamic forces in inducer were reported in this paper, showing that cavitation-induced unbalance hydrodynamics can cause turbopump failure.
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