One-dimensional Analysis Method for Cavitation Instabilities of a Rotating Machinery

[+] Author and Article Information
Satoshi Kawasaki

1, Koganezawa, kimigaya Kakuda, Miyagi 981-1525 Japan

Takashi Shimura

Japan Aerospace Exploration Agency, 1 Koganezawa, Kakuda, Miyagi, 981-1525, Japan

Masaharu Uchiumi

Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido, 050-8585, Japan

Yuka Iga

Institute of Fluid Science, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan

1Corresponding author.

ASME doi:10.1115/1.4037987 History: Received September 12, 2016; Revised August 22, 2017


Rotating cavitation is an important problem, which makes it difficult to design reliable rotating machines. In the present study, a simple analysis method that tried to evaluate the cavitation instabilities of a rotating machinery by using one-dimensional system analysis software was attempted. In this method, cavitation compliance and mass flow gain factor are distributed in each flow path of the inducer. Analysis results show that cavitation instabilities, including rotating phenomena, exist. With the evolved analysis model, effects of various parameters on the eigenvalues of the system were investigated. Analysis results agreed with inducer test results qualitatively. Furthermore, by the analysis considered whirl motion of the rotor, effects of it on cavitation instabilities were investigated.

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