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Experimental and numerical investigation of supercavity drag reduction of wing-projectiles under small cavitation number


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Experimental and numerical investigation of supercavity drag reduction of wing-projectiles under small cavitation number
Xiong Tianhong1Zhang Mu2Yi Wenjun1Liu Yixin1
1.National Key Laboratory of Transient Physics; 2.School of Energy and Power Engineering,NUST,Nanjing 210094,China
drag reduction supercavity wing-projectiles unsteady flow cavitation number
In order to investigate the supercavity drag reduction characteristics of underwater high-speed wing-projectiles,wing-projectile models with multi-configuration parameters are designed.The experiments of the supercavitating wing-projectile ripping from air into water are carried out with the self-developed underwater speed measuring system.By analyzing the experimental data,the drag coefficients of the supercavitating wing-projectile small cavitation number are determined.Based on the N-S equations and the algorithm of the pressure-implicit with splitting of operators(PISO),the numerical simulation of the three-dimensional unsteady cavitating flow around the wing-projectile is implemented by adopting the large eddy simulation(LES)turbulence model and VOF method.The numerical simulation result agrees well with the experiment.On the basis of experimental data and numerical simulation,the supercavity drag reduction effect of the wing-projectile under the small cavitation number is analyzed and the drag reduction ratio can reach 93.1% approximately.Finally,the supercavitating flow of general projectile is investigated.The results show that the wing structure has little influences on the drag characteristics of the supercavitating projectile and the wing-projectile has good navigation stability.


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Last Update: 2013-04-30