국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Observation of the Cavitation in Rocket Turbopump Inducer. 2nd Report Backward-Traveling Rotating Cavitrtion.
저자	Satoshi HASEGAWA, Mitsuo WATANABE, Tomoyuki HASHIMOTO, Yoshiaki WATANABE, Hitoshi YAMADA
Keyword	Rocket; H-II; Turbopump; Inducer; Rotating Cavitation
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001382.pdf?id=NALTR0001382
보고서번호	NAL TR-1382
발행년도	1999.03
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	During the development of a liquid oxygen turbopump for the LE-7engine of the H-II rocket, super synchronous vibrations（1.0～1.3w）in the inducer were frequently observed. From research on the vibration performance of the inducer, it was concluded that shaft vibrations of this type were caused by rotating cavitation in the inducer, and it was also demonstrated that a moderately increased diameter of the pump inlet was most effective in suppressing these shaft vibrations. In the light of previous theoretical analysis, it was predicted that rotating cavitation had two unstable modes, a forward rotating cavitation and a backward rotating cavitation, which had not hitherto been observed in experiments. In the suction performance test of the inducer using the cavitation tunnel, a shaft vibration of higher frequency than the forward rotating cavitation were observed. From a study using a high-speed photograph analyzer and the spectrum analysis of the shaft vibration, it was concluded that the vibration was caused by the backward rotating cavitation. This paper provides details on the occurrence of backward rotating cavitation in the inducer and its performance.