Experimental Investigation on Hydrodynamic Characteristics of Supercavitating Vehicle during Its Motion

doi:10.3969/j.issn.1000-1093.2019.11.011

Abstract

Abstract: The free-running process of supercavitating vehicle is experimentally studied to investigate the hydrodynamic characteristics of supercavitating vehicle during its motion. The evolutionary process of supercavitation in a pool is observed by using a high-speed video camera, the surface pressure of the vehicle is measured by using the pressure sensors, and the hydrodynamic characteristics of supercavitating vehicle are measured by using a built-in measuring device. The experimental results show that the axial force coefficient is not a steady value which is fluctuated around an average value of about 0.1, the average axial force coefficient increases with running time, and the normal force coefficient fluctuates 0 due to the linear movement. The normal force coefficient fluctuates periodically with time, and the fluctuation cycle is about 0.055 s. It is found that the pose of supercavitating vehicle varies due to the gravity and other impact factors, the one rear side of the vehicle impacts the cavity, a peak pressure occurs, which causes the normal force to be increasing, and then the rear of the vehicle moves to the other side due to the restoring moments. A phenomenon of the trailing cycle oscillation on the vehicle impacting to the cavity occurs, and the periodic evolution of flow field leads to the periodic change in the normal force coefficient. Key

Key words: supercavitatingvehicle, supercavity, hydrodynamics, freemotion, cyclicity, experimentalstudy

CLC Number:

TV131.3⁺2

SHI Suguo， WANG Yadong， YANG Xiaoguang， LIU Lehua. Experimental Investigation on Hydrodynamic Characteristics of Supercavitating Vehicle during Its Motion[J]. Acta Armamentarii, 2019, 40(11): 2266-2271.

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第40卷
第11期2019 年11月兵工学报ACTA
ARMAMENTARIIVol.40No.11Nov.2019

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