A Rotating Stall Type Phenomenon Caused by Cavitation in LE-7A LH2 Turbopump

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概要

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• The cause of 350 Hz large-amplitude rotor vibration of the H-2A rocket's LE-7A fuel turbopump was investigated by wideband oscillating-pressure measurement. Measurement was successfully conducted by quartz-type pressure sensors in full-load liquid-hydrogen tests. The phase difference of pressure oscillations between two pressure measurement ports under conditions of pump cavitating operation revealed a phenomenon similar to rotating stall in turbomachinery which had not been previously observed. The rotating speed of a cell was 350 Hz, about a half the rotor speed. This phenomenon is different from rotating cavitation in which the cavitation pattern rotates around the periphery of an impeller faster than shaft rotating speed. Based on these findings, it was concluded that this phenomenon caused the large-amplitude 350 Hz vibration of the LE-7A fuel turbopump. Results of FFT analysis of measured oscillating pressure are presented.

• 一般社団法人日本機械学会の論文
• 2002-02-15

著者

• YOSHIDA Makoto

  National Food Research Institute

• Kamijo Kenjiro

  Tohoku University

• Uchiumi Masaharu

  National Space Development Agency

• SHIMURA Takashi

  National Aerospace Laboratory, KSPL

• YASUTOMI Yoshinobu

  Ishikawajima-Harima Heavy Industries

• Shimura Takashi

  National Aerospace Laboratory Kspl

• Yoshida Makoto

  National Aerospace Laboratory Kspl

• Yoshida Makoto

  National Aerospace Laboratory Kakuda Research Center

関連論文

• Characterization of a Thermostable Endo-β-1,4-D-galactanase from the Hyperthermophile Thermotoga maritima
• Developmental History of Liquid Oxygen Turbopumps for the LE-7 Engine
• A Rotating Stall Type Phenomenon Caused by Cavitation in LE-7A LH2 Turbopump
• Axial Thrust Balancing of the LE-7 LOX Turbopump

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