Influence of Transonic motion on Resistance and Cavitation Characteristics of Projectiles

doi:10.3969/j.issn.1000-1093.2016.08.021

Abstract

Abstract: In order to research the resistance characteristics and flow cavitation of supercavitation projectiles during transonic motion, a numerical model of a compressible and supercaitation flow field is established based on VOF multiphase model, Schnerr-Sauer cavitation model, realizable k-ε turbulence model, Tait liquid state equation and moving frame model.The proposed model is validated by comparing the numerical results with those in Ref.\[11\], and the external flow field of supercavitation projectile flying at Mach number between 0.202 and 1.281 is simulated. The simulated results show that, during transonic motion , the resistance coefficient of projectile is related to the peak value of density at the stationary point of flow field and increases with the increase in flying speed; and the shockwaves have significant influence on the shapes and dimensions of supercavities near projectile. Under subsonic condition, the flying speed of projectile has no significant influence on the dimensions of supercavities, and the shapes of supercavities coincide with theoretical results; under supersonic condition, the dimensions of supercavities decrease sharply with the increase in flying speed.

Key words: ordnance science and technology, supercavitation projectile, transonic motion, cavitation characteristic, state equation of liquid, shockwave

CLC Number:

O351.2

HUANG Chuang, DANG Jian-jun, LI Dai-jin, LUO Kai. Influence of Transonic motion on Resistance and Cavitation Characteristics of Projectiles[J]. Acta Armamentarii, 2016, 37(8): 1482-1488.

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