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《Acta Mechanica Sinica》 2001-01
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FLOW CONTROL ON UNSTABLE CAVITATION PHENOMENA

Gu Wei,He Yousheng (Shanghai Jiao Tong University, Shanghai 200030, China)  
Periodicity of cavitating flow in transcritical stage results in violent vibration, noise and impact,and also earlierises the fatigue and severes the cavitation erosion. The flow of cavity closure is always in the state of most instability and turbulence, especially it will generate vortical cavitating flow when in transitional status. The excitation of vibration is caused by the large-scale cloud cavitation shedding. The formation and development of cloud cavitation have strong corre- lation with boundary layer effect. Flow structure in the local region of cavity closure remarkably influences the general stability of cavitation flow. A trip bar, 1 mm in thickness and 10mm in breadth, was attached on the upper surface of a NACA16012 hydrofoil in the experiment, with which the local flow region could be modified with the changes of the whole cavitation patterns and flow instability. It is found out that, the efficiency of trip bar on the suppression of cavitation fluctuation is affected by the dimension and position of cavitation development.Better effects were acquired when cavity closure is upstream of the trip bar, and cavity is low in thickness dimension. As a result, the self-excited fluctuation of the hydrofoil cavitation flows was suppressed to some extent in a certain range of cavitation number for the trip bar in 35% chordwise position. However the trip bar in 75% chordwise position did not make favorable effect in this test. The generally accepted hypothesis of reentrant-jet is depicted to discuss the mechanism of cloud cavitation shed- ding. Furthermore, a new explanation based on the experimental results was proposed on trial to explore the real mechanism of the instability of transcritical cavitation flow.
【Fund】: 国防科技预研基金资助项目!(98J14.3.5.JW0303)&&
【CateGory Index】: TV131.32
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