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Analysis on hydrodynamic characteristic and cavity form of high-speed projectile with small angle of attack

Based on the Rayleigh-Plesset homogeneous hypothesis and the compressible mixture multiphase model, three-dimensional CFD numerical calculation model of high-speed projectile under water was built. Compared with the empirical formula, the consistency between it and results from model on the conditions of zero-angle attack and fixed cavitation number is good. Therefore, the validity of numerical method and preferences was verified. According to the built model, the hydrodynamic characteristics of supercavitating flow in angle of attack within 2° and cavity form were studied in computational simulation way. Thus, the law of effect of angle of attack on cavity form was obtained. Results have showed that the hydrodynamic characteristic of projectile has different trends with different angles of attack value. The results of this paper can provide theory basis for the further researching on trajectory performance of high-speed projectiles.