0
TECHNICAL PAPERS

Influence of Thermodynamic Effect on Synchronous Rotating Cavitation

[+] Author and Article Information
Yoshiki Yoshida

Japan Aerospace Exploration Agency, Kakuda Space Center, 1 Koganezawa, Kimigaya, Kakuda, Miyagi 981-1525, Japankryoshi@kakuda.jaxa.jp

Yoshifumi Sasao

JAXA Research Student Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai Miyagi 980-8577, Japansasao@cfs.ifs.tohoku.ac.jp

Kouichi Okita

Japan Aerospace Exploration Agency, Tsukuba Space Center, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan

Satoshi Hasegawa, Mitsuru Shimagaki

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

Toshiaki Ikohagi

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

J. Fluids Eng. 129(7), 871-876 (Jan 10, 2007) (6 pages) doi:10.1115/1.2745838 History: Received August 18, 2006; Revised January 10, 2007

Synchronous rotating cavitation is known as one type of cavitation instability, which causes synchronous shaft vibration or head loss. On the other hand, cavitation in cryogenic fluids has a thermodynamic effect on cavitating inducers because of thermal imbalance around the cavity. It improves cavitation performances due to delay of cavity growth. However, relationships between the thermodynamic effect and cavitation instabilities are still unknown. To investigate the influence of the thermodynamic effect on synchronous rotating cavitation, we conducted experiments in which liquid nitrogen was set at different temperatures (74K, 78K, and 83K). We clarified the thermodynamic effect on synchronous rotating cavitation in terms of cavity length, fluid force, and liquid temperature. Synchronous rotating cavitation occurs at the critical cavity length of Lch0.8, and the onset cavitation number shifts to a lower level due to the lag of cavity growth by the thermodynamic effect, which appears significantly with rising liquid temperature. Furthermore, we confirmed that the fluid force acting on the inducer notably increases under conditions of synchronous rotating cavitation.

FIGURES IN THIS ARTICLE
<>
Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic diagram of the Cryogenic Inducer Test Facility

Grahic Jump Location
Figure 2

Photograph and illustration of the test section installed pressure sensors to estimate cavitation region

Grahic Jump Location
Figure 3

Development view of the inducer showing location of pressure sensors along the inducer blade

Grahic Jump Location
Figure 4

Waterfall of pressure fluctuation under synchronous rotating cavitation and normal state at Pos. 4

Grahic Jump Location
Figure 5

Figures of estimated cavity region near synchronous rotating cavitation obtained from the measured pressure distribution

Grahic Jump Location
Figure 6

Photographs of synchronous rotating cavitation which show the unequal cavity length of each blade

Grahic Jump Location
Figure 7

Variations of the thermodynamic function Σ, including points of experimental conditions and water at 300K

Grahic Jump Location
Figure 8

Cavitation performances and cavity length of each channel for three temperatures of liquid nitrogen (74K, 78K, and 83K), showing unequal cavity length under synchronous rotating cavitation (uncertainty in σ∕σ0=0.02, ψ∕ψ0=0.01, Lc∕h=0.03)

Grahic Jump Location
Figure 9

Transition of cavitating state, including inducer-specific unstable region

Grahic Jump Location
Figure 10

Influence of temperature on cavity length between 74K and 83K (uncertainty in σ∕σ0=0.02, Lc∕h=0.03)

Grahic Jump Location
Figure 11

Variations of cavity length, estimated fluid force and shaft vibration, indicating amplification of shaft vibration due to increasing the fluid force during occurrence of synchronous rotating cavitation (uncertainty in σ∕σ0=0.02, Lc∕h=0.03, F∕Fmax=0.05)

Grahic Jump Location
Figure 12

Vector orbits of fluid force and shaft vibration, indicating similar phase change in vector orbit under conditions of synchronous rotating cavitation

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In