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Numerical analysis of a ventilated supercavity under periodic motion of the cavitator

Journal of Hydrodynamics 2021年第6期33卷 1216-1229页

作者： Yun-hua Jiang Zhi-hui Zou Jia Li Yao Yao Le-le Yang School of Ocean Engineering and Technology Sun Yat-sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Department of Aerospace Engineering Harbin Engineering UniversityHarbin 150001China AVICJonhon Optronic Technology Co. Ltd.Luoyang 471003China

This paper presents a numerical simulation of the geometry and the pressure distribution of a ventilated supercavity at different cavitator amplitudes and periods of *** numerical method is validated by comparing with the results of a semi-empirical formula under specific *** is shown that the simulation can capture the boundary fluctuations of the ventilated supercavity and its internal pressure variations in a cavitator motion *** simulation results show that the supercavity boundary experiences wave-like deformations when the wavelength of the disturbance caused by the cavitator motion is comparable to the supercavity *** is also shown that the supercavity closure changes in form between a re-entrant jet and a twin vortex owing to the variations of the pressure difference between the outside and the inside of the supercavity near the closure *** maximum diameter of the ventilated supercavity exhibits periodic changes with a double peak in each cavitator motion cycle,caused by the corresponding changes of the difference between the internal and external *** the increase of the amplitude of motion of the cavitator,the supercavity boundary has enhanced wave-like undulations,with an increased maximum diameter,and with fluctuations in the cavitation *** the period of the cavitator motion increases,the wavelength of the disturbances caused by this motion becomes greater than the supercavity length,and so the wave-like undulations of the supercavity boundary and the maximum diameter of the supercavity gradually decrease,but the variations of the cavitation number ***,with the increase of the periods,the delay effects on the variations of the characteristics of the supercavity geometry caused by cavitator motion gradually decrease,and they practically vanish for large periods.

关键词： ventilated supercavity geometrical and pressure characteristics cavitator motion

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Transient dynamic analysis for the ventilated supercavity under the action of tail jetting flow

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Acta Mechanica Sinica 2022年第4期38卷 91-103,I0002页

作者： Min Xiang Houcun Zhou Xiaoyu Zhao Bo Liu College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China China Aerodynamics Research and Development Center Mianyang 621000China

ventilated cavitation could be applied to underwater vehicles to achieve a high drag-reduction *** ventilated supercavity may experience deformation,fluctuation,and instability under the influence of the high-speed jetting flow generated by the propulsion *** study focuses on understanding the transient dynamics of a ventilated supercavity with jetting flow at the *** are performed in an open water tunnel system with a high degassing *** evolution of the gas-liquid interface under different jetting flow rates is recorded in detail.A compressible multiphase model coupled with shear stress turbulence(SST)and surface capturing models is adopted herein to study the flow pattern in *** the jet velocity increases from subsonic to sonic speed,the flow field presents three different modes that could be identified as the transparent cavity(TC),transparent cavityjetting(TC-J),and deformed cavity-jetting(DC-J)modes.A new gas shedding scheme that couples twinvortex shedding with surface fluctuation shedding is observed in the TC *** variations in the internal flow structure and the local pressure vibration are discussed in *** transition of the flow pattern with dimensionless jetting momentum ratio and kinetic energy ratio is *** obtained results could provide valuable insights into the control of the ventilated supercavity.

关键词： ventilated supercavity Jet flow Gas-liquid flow Drag reduction

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THE COMPARATIVE STUDY OF ventilated SUPER CAVITY SHAPE IN WATER TUNNEL AND INFINITE FLOW FIELD

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Journal of Hydrodynamics 2010年第5期22卷 689-696页

作者： ZHOU Jing-jun YU Kai-ping MIN Jing-xin YANG Ming School of Astronautics Harbin Institute of Technology Harbin 150001 China

In order to understand the difference of ventilated supercavity in water tunnel and infinite flow field, 3-D numerical simulations are carried out to obtain the ventilated supercavity in above mentioned conditions based on RANS equations, using the finite volume method and SST turbulence model in the framework of the two fluid multiphase flow model. The numerical method adopted in this article for the infinite flow field and water tunnel experiments is validated by comparing results with those of empirical formulas and experimental data. On this basis the difference between water tunnel experiments and infinite flow field is studied, including the influence of the route loss and the blocking effect in the water tunnel. Finally, some suggestions are made for water tunnel experiments.

关键词： ventilated supercavity two fluid multiphase model ambient pressure viscous effect blocking effect cavitation number

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Effect of attack angle change on hydrodynamic character of supercavitating bodies

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Journal of Harbin Institute of Technology(New Series) 2009年第3期16卷 419-423页

作者：蒋增辉于开平王聪张嘉钟黄文虎 School of Astronautics Harbin Institute of Technology

A series of experiments has been done in a moderate-velocity cavitation tunnel to investigate the effects of attack angle change on hydrodynamic characters of supercavitation. Hydrodynamic characters of the aft section at various attack angles were compared. The investigation shows that hydrodynamic forces of the aft section are dependent of supercavity shapes at different attack angles,and the magnitude of hydrodynamic forces of the aft section varies with the change of attack angle. When the aft section is in the fully wetted case,the drag coefficient changes little. Lift and moment coefficients both increase with the increased attack angle,and the increase magnitude is not large. When the aft body planing is on the cavity boundary,the drag coefficient of nonzero attack angle is larger than that of zero attack angle,and the maximal lift and moment coefficients both vary obviously with the increased attack angle. In the case that the body is fully enveloped by cavity,the drag coefficient,lift coefficient and moment coefficient are nearly constant with the change of attack angles.

关键词： ventilated supercavity hydrodynamic character attack angle

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