scholarly journals Vibrations of an Axisymmetric Body in a Cavitating Leakage Flow

1994 ◽  
Vol 37 (1) ◽  
pp. 70-77
Author(s):  
Masaaki Arai ◽  
Masaaki Saito ◽  
Ichiro Minohata ◽  
Kiyohiro Tajima
Keyword(s):  
Axisymmetric Body ◽  
Leakage Flow

scholarly journals Vibrations of an Axisymmetric Body in a Cavitating Leakage Flow.

1991 ◽  
Vol 57 (544) ◽  
pp. 3754-3760
Author(s):  
Masaaki ARAI ◽  
Masaaki SAITO ◽  
Ichiro MINOHATA ◽  
Kiyohiro TAJIMA
Keyword(s):  
Axisymmetric Body ◽  
Leakage Flow

Study on Mechanism for Unstable Vibrations of an Axisymmetric Body in a Cavitating Leakage Flow

2002 ◽  
Author(s):  
Masaaki Arai
Keyword(s):  
Cross Sections ◽  
Fluid Dynamic ◽  
Axisymmetric Body ◽  
The Self ◽  
Leakage Flow ◽  
Cavitation Bubbles ◽  
Dynamic Damping ◽  
Dynamic Forces ◽  
The One ◽  
Theoretical Results

An axisymmetric body in a cavitating narrow annular parallel passage attains the self-excited vibrations when the apparent passage formed by the cavitation bubbles becomes certain conditions. This paper presents experimental and analytical studies on the mechanism for such unstable vibrations. In order to examine the apparent passage, the cross-sections of the leakage flow containing the cavitation are observed in the one-dimensional leakage model. When the self-excited vibrations occur, the cavitation bubbles disappear in the vicinity of the exit. Relating these apparent passages to the annular passage, the fluid-dynamic forces acting on an axisymmetric body are investigated theoretically. The theoretical results show that the fluid-dynamic damping is negative when the unstable vibrations occur experimentally.

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