Effects of periodic gust flow on super-cavitation morphology and hydrodynamic characteristics of a ventilated vehicle

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (13) : 208-214.

WANG Wei,WANG Cong,LI Conghui,DU Yanfeng

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Abstract

Effects of periodic gust flow on super-cavitation morphology and hydrodynamic characteristics of ventilated vehicle were numerically simulated with the dynamic grid technique. Firstly, comparing the numerical computation results with test data, the feasibility of the dynamic grid technique being used to simulate periodic gust flow was verified. Then, based on this simulation method, the super-cavitation morphology evolution process and hydrodynamic change features of a ventilated vehicle under the action of periodic gust flow were investigated. The results showed that under the action of periodic gust flow, super-cavitation morphology of the ventilated vehicle reveals a periodic change, size and position of wetted area of the vehicle also change to cause periodic change of hydrodynamic coefficient; the proportion of the vehicle’s wetted area resistance in total resistance increases with increase in wetted area; the proportion of wetting area lift in total lift is larger, there is a high pressure zone near cavitation closing line ofwetted area to make small wetted area provide a very big lift for vehicle.

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Gust flow / Ventilated supercavity / Wetted area / Fluid dynamics

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WANG Wei,WANG Cong,LI Conghui,DU Yanfeng. Effects of periodic gust flow on super-cavitation morphology and hydrodynamic characteristics of a ventilated vehicle[J]. Journal of Vibration and Shock, 2019, 38(13): 208-214

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