Experimental study on pressure fluctuating characteristic around ventilated vehicle

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (17) : 85-90.

ZHANG Xiao-shi1, WANG Cong1, ZHANG Nai-min2, ZHAO Cheng-gong1

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Abstract

The cavity around the ventilated vehicle was invested in water tunnel. The experiment was carried out to study cavity characteristics with different cavitation number. The experiment also studied the fluctuating hydrodynamics around the vehicle. In order to analyze the cavity stability around the vehicle in the water flow. Dynamic force measurement system was used to record the surface pressure of ventilated vehicle under different cavitation numbers. The fluctuating hydrodynamic characteristics were obtained. The results show that cavity shapes reveal the patterns of flow in different development stages, which are strongly correlated with unsteady dynamics characteristics. Frequency characteristics of the unsteady cavitating flows are different under different cavitation conditions. For the ventilated vehicle, the frequency pulsation characteristics are caused by the large cloud break-off and shedding at its surface zone. The peak level increases with decrease in cavitation number and the surface pressure fluctuation is small.

Key words

underwater vehicle / water tunnel experiment / cavity shedding / stability / frequency domain analysis / pulsating characteristic;

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ZHANG Xiao-shi1, WANG Cong1, ZHANG Nai-min2, ZHAO Cheng-gong1. Experimental study on pressure fluctuating characteristic around ventilated vehicle[J]. Journal of Vibration and Shock, 2017, 36(17): 85-90

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