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INTERFERENCE OF SIDE STRUT WITH THE natural cavitating flowS AROUND A SUBMERGED VEHICLE IN WATER TUNNEL EXPERIMENTS

Journal of Hydrodynamics 2011年第5期23卷 554-561页

作者： CHEN Xin YAO Yan. LU Chuan-jing CHEN Ying CAOJia-yi Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China Department of Engineering Mechanics and State Key Laboratory of Ocean Engineering Shanghai Jiao TongUniversity Shanghai 200240 China Department of Engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China

To apply the measurements of model experiment in water tunnel to the actual sailing condition, it is necessary to know accurately the strut effect and its rule. In the present work, the corresponding interferences of one-side strut and two-side strut on the natural cavitating flows around a submerged vehicle in water tunnel were investigated numerically, using the homogeneous equilibrium two-phase model coupled with a natural cavitation model. The numerical simulation results show that the strut types have distinct effects on the hydrodynamic properties. For the same given upstream velocity and downstream pressure, the existence of the strut leads to an increment of natural cavitation number, reduces the low-pressure region and depresses the pressure on the vehicle surface near the sides of strut. In the case of given cavitaiton number, the influences of the two-side strut on the drag and lift coefficients are both enhanced along with the increment of attack angle, however the influence of the one-side strut gradually gets stronger on the drag coefficient but weaker on the lift coefficient contrarily. In addition, based on the present numerical results, a correction method by introducing the sigmoidal logistic function is proposed to eliminate the interference from the foil-shaped strut.

关键词： strut effect natural cavitating flow submerged vehicle water tunnel experiment

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