【摘要】 将嵌套方法和结构网格相结合,提出了一种高效的时间精确数值计算方法,对不同释放力下小型外挂物的投放进行了数值模拟.该模拟在有实验验证算例的基础上进行.首先对马赫数Ma=0.95下从机翼上挂载投放弹体过程进行了分析,并将模拟结果与实验结果进行比较,二者具有很好的一致性,表明该方法的准确性和可靠性.利用上述方法对一小型弹药在不同释放力组合下的投放进行了数值模拟.结果表明,投放物和释放力的参数特性对投放后物体的运动影响较大,尤其是前端释放力的大小和作用位置对该弹药投放后的俯仰角影响显著.对同一投放物来说,释放力参数的准确程度决定着数值模拟的准确性.计算结果为气动设计及有控投放提供了依据.更多还原

【Abstract】 A method combining the advantages of chimera method and structured grid into a unified algorithm is developed to predict unsteady fluid flow involving moving geometries.It provides an efficient and time accurate calculation.The computational trajectory results of test case are validated against the available experimental data of a generic wing-pylon-store configuration at Mach 0.95.The results demonstrate that the method can provide an accurate and viable approach for this problem.After testing,a light munition separation performance is analysed at Mach 0.6 under two different ejector forces.The results showed that accurate store properties and ejector forces are critical for an accurate numerical simulation.The forward ejector force has a significant effect on the computational results,most notably for the predicted pitch and yaw angles,indicating the dependence of accurate trajectory simulations on accurate ejector force properties and accurate store properties.更多还原