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数值模拟方法是研究机弹分离问题的一种高效且经济的手段,它为研究炸弹与载机的安全分离、气动干扰等问题提供了参考依据。应用计算流体动力学软件FLUENT的二次开发功能和RNG k-ε湍流模型建立了投弹流场数值模拟和弹道仿真相结合的炸弹投放仿真模型;运用动网格技术更新投放物与载机发生相对运动而导致的计算域变化;将整个流场的解与六自由度运动方程的解进行耦合,模拟计算了炸弹与载机分离的过程;得到了在气动干扰下炸弹姿态角和位置随时间变化图。结果表明,在超音速条件下气动干扰对投弹的纵向运动影响非常严重,而横侧向运动受气动干扰影响不大。
The numerical simulation method is an efficient and economical method to study the separation of the projectile and bombs. It provides a reference for the research on the safe separation of bombs and the carrier-borne aircraft and the aerodynamic interference. Based on the secondary development of computational fluid dynamics software FLUENT and the RNG k-ε turbulence model, a simulation model of the bomb deployment combining the simulation of the projectile flow field and the trajectory simulation is established. The moving grid technology is used to update the delivery of the bomb and the carrier. And the solution of the equation of motion of six degrees of freedom is coupled. The process of the separation of the bombs and the carrier is simulated. The attitude and position of the bombs under aerodynamic disturbance are obtained with time Figure The results show that the influence of aerodynamic disturbance on the longitudinal movement of the projectile is very serious under the supersonic speed, while the lateral lateral motion is not affected by the aerodynamic interference.