It has been shown by experimental and numerical studies that various cavitation instabilities occur in inducers for rocket engines when the cavity length exceeds about 65% of the blade spacing. On the other hand, it has been pointed out by an experimental study that the cavitation instabilities occur when the pressure gradient near the throat becomes small to some degree. The present study is motivated to examine the latter criterion based on pressure gradient for cavitation instabilities from the viewpoint of theoretical analysis. For this purpose, analyses of steady flow and its stability were carried out for cavitating flow in cascades with circular arc and plano-convex blades by a singularity method based on closed cavity model. It was found that the criterion based on the cavity length for the occurrence of cavitation instabilities is more adequate than the criterion based on the pressure gradient. It was also found that the steady cavity length and the stability of the flow in both cascades can be practically correlated with a parameter , where is a cavitation number, is an angle of attack, and is a shockless angle of attack.
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e-mail: horiguti@me.es.osaka-u.ac.jp
e-mail: relcom@semenov.dp.ua
e-mail: masataka̱nakano@ihi.co.jp
e-mail: tujimoto@me.es.osaka-u.ac.jp
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Linear Stability Analysis of the Effects of Camber and Blade Thickness on Cavitation Instabilities in Inducers
Hironori Horiguchi,
Hironori Horiguchi
Graduate School of Engineering Science,
e-mail: horiguti@me.es.osaka-u.ac.jp
Osaka University
, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
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Yury Semenov,
Yury Semenov
Institute of Technical Mechanics,
e-mail: relcom@semenov.dp.ua
National Academy of Science and National Space Agency of Ukraine
, 15, Leshko-Popel’ St., Dniepropetrovsk, 49005, Ukraine
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Masataka Nakano,
Masataka Nakano
Technical Development and Engineering Center, Turbo and Hydraulic Machinery Department,
e-mail: masataka̱nakano@ihi.co.jp
Ishikawajima-Harima Heavy Industries Co., Ltd.
, 1 Shin-nakahara, Isogo, Yokohaha, Kanagawa, 235-8501, Japan
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Yoshinobu Tsujimoto
Yoshinobu Tsujimoto
Graduate School of Engineering Science,
e-mail: tujimoto@me.es.osaka-u.ac.jp
Osaka University
, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
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Hironori Horiguchi
Graduate School of Engineering Science,
Osaka University
, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japane-mail: horiguti@me.es.osaka-u.ac.jp
Yury Semenov
Institute of Technical Mechanics,
National Academy of Science and National Space Agency of Ukraine
, 15, Leshko-Popel’ St., Dniepropetrovsk, 49005, Ukrainee-mail: relcom@semenov.dp.ua
Masataka Nakano
Technical Development and Engineering Center, Turbo and Hydraulic Machinery Department,
Ishikawajima-Harima Heavy Industries Co., Ltd.
, 1 Shin-nakahara, Isogo, Yokohaha, Kanagawa, 235-8501, Japane-mail: masataka̱nakano@ihi.co.jp
Yoshinobu Tsujimoto
Graduate School of Engineering Science,
Osaka University
, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japane-mail: tujimoto@me.es.osaka-u.ac.jp
J. Fluids Eng. May 2006, 128(3): 430-438 (9 pages)
Published Online: October 25, 2005
Article history
Received:
July 25, 2004
Revised:
October 25, 2005
Citation
Horiguchi, H., Semenov, Y., Nakano, M., and Tsujimoto, Y. (October 25, 2005). "Linear Stability Analysis of the Effects of Camber and Blade Thickness on Cavitation Instabilities in Inducers." ASME. J. Fluids Eng. May 2006; 128(3): 430–438. https://doi.org/10.1115/1.2173291
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