潜射导弹垂直发射过程流体动力特性数值模拟

采用数值模拟的方法研究了潜射导弹垂直发射上升过程空泡多相流和流体动力演化规律。基于连续性方程、空化质量输运方程、混合介质RANS方程和标准k-ε湍流模型,结合动网格技术,实现了弹体边界运动与汽水流场的流体—固体耦合问题求解。以此为基础,数值模拟了重力影响下的潜射导弹垂直发射水下运动过程,对比分析了潜射导弹头型对肩空泡和流体动力的影响,并给出了3组重推比下潜射导弹的水下航行弹道。模拟和分析结果表明,局部肩空泡将增加潜射导弹流体动力,通过改变导弹头部线型可以抑制肩部空化、改善导弹的流体动力。

Numerical Simulation on Hydrodynamic Characteristics of Submarine Missile in the Vertical Launch Process

The cavitation flow characteristics and hydrodynamic evolution during the rise of submarine launched missile were researched by using a numerical simulation method. The fluid-solid coupling problem of moving boundary of missile body and cavitation flow field was solved by using a continuity equation, transport equations of liquid mass fraction, RANS (Reynolds-Averaged Navier-Stokes) equation in conjunction with a dynamic mesh technique and a standard k-ε turbulence model. Furthermore, the underwater moving process of submarine launched missile was numerically simulated, the effect of warhead lines of submarine launched missile on the partial cavitation and hydrodynamic performance was analyzed in detail, and three groups of underwater trajectory of submarine launched missile in the case of thrust-weight ratio were given . The simulational and analysis results show that the partial cavitating can increase the hydrodynamic performance of missile, and a modest warhead lines of missile can restrain the partial cavitation and improve its hydrodynamic performance.