Rotating cavitation in inducers is known as one type of cavitation instability, in which an uneven cavity pattern propagates in the same direction as the rotor with a propagating speed ratio of 1.0–1.2. This rotating cavitation causes shaft vibration due to the increase of the unsteady lateral load on the inducer. On the other hand, cavitation in cryogenic fluids has a thermodynamic effect because of the thermal imbalance around the cavity. It improves cavitation performances due to the delay of cavity growth. However, the relationship between the thermodynamic effect and cavitation instabilities is still unknown. To investigate the influence of the thermodynamic effect on rotating cavitation, we conducted experiments in which liquid nitrogen was set at different temperatures (74 K, 78 K and 83 K) with a focus on the cavity length. At higher cavitation numbers, super-synchronous rotating cavitation (Super-SRC) occurred at the critical cavity length of Lc/h ≅ 0.5 with a weak thermodynamic effect in terms of the fluctuation of cavity length. In contrast, synchronous rotating cavitation (SRC) occurred at the critical cavity length of Lc/h ≅ 0.9–1.0 at lower cavitation numbers. The critical cavitation number shifted to a lower level due to the suppression of cavity growth by the thermodynamic effect, which appeared significantly with rising liquid temperature. The unevenness of cavity length under synchronous rotating cavitation was decreased by the thermodynamic effect. Furthermore, we confirmed that the fluid force acting on the inducer notably increased under conditions of rotating cavitation, but that the amplitude of the shaft vibration depended on the degree of the unevenness of the cavity length through the thermodynamic effect.
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ASME/JSME 2007 5th Joint Fluids Engineering Conference
July 30–August 2, 2007
San Diego, California, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4289-4
PROCEEDINGS PAPER
Thermodynamic Effect on Rotating Cavitation in an Inducer
Yoshiki Yoshida,
Yoshiki Yoshida
Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan
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Yoshifumi Sasao,
Yoshifumi Sasao
Tohoku University, Sendai, Miyagi, Japan
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Mitsuo Watanabe,
Mitsuo Watanabe
Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan
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Tomoyuki Hashimoto,
Tomoyuki Hashimoto
Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan
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Yuka Iga,
Yuka Iga
Tohoku University, Sendai, Miyagi, Japan
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Toshiaki Ikohagi
Toshiaki Ikohagi
Tohoku University, Sendai, Miyagi, Japan
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Yoshiki Yoshida
Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan
Yoshifumi Sasao
Tohoku University, Sendai, Miyagi, Japan
Mitsuo Watanabe
Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan
Tomoyuki Hashimoto
Japan Aerospace Exploration Agency, Kakuda, Miyagi, Japan
Yuka Iga
Tohoku University, Sendai, Miyagi, Japan
Toshiaki Ikohagi
Tohoku University, Sendai, Miyagi, Japan
Paper No:
FEDSM2007-37468, pp. 423-429; 7 pages
Published Online:
March 30, 2009
Citation
Yoshida, Y, Sasao, Y, Watanabe, M, Hashimoto, T, Iga, Y, & Ikohagi, T. "Thermodynamic Effect on Rotating Cavitation in an Inducer." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 2: Fora, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 423-429. ASME. https://doi.org/10.1115/FEDSM2007-37468
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