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为了研究弹体外挂投放与内埋投放的区别,利用基于Menter SST湍流模式的改进延迟分离涡模拟(IDDES)方法以及重叠网格技术,分别对亚声速和超声速来流条件下,同一弹体外挂投放和内埋投放进行了数值模拟,得到了亚声速和超声速条件下外挂投放与内埋投放弹体的下落规律。通过对比分析表明:亚声速和超声速来流条件下,内埋投放由于受舱体内强非定常流场以及舱体唇口剪切层的影响,弹体受很大的抬头力矩,弹体姿态角变化较大,投放特性劣于外挂投放。进一步研究表明:在弹射时给弹体一定的低头角速度,使弹体以低头姿态穿越剪切层,则可以大幅度降低剪切层带来的不利影响,提高内埋投放弹体分离品质。
In order to study the difference between throw-in and throw-in of projectile, the improved IDDES method based on Menter SST turbulence model and the overlapped grid technique were used to simulate the projectile loading, Putting into operation and putting into place carry on the numerical simulation, have got the falling law of putting the bullet and placing the bullet body under subsonic and supersonic speed condition. Through comparative analysis, it is shown that under the condition of sub-sonic and supersonic flow, the projectile is subjected to great heading moment and projectile attitude angle due to the strong unsteady flow field inside the tank and the shear layer of the lip of the tank body. Variations, delivery characteristics inferior to plug-in delivery. Further studies show that when the projectile is ejected, a certain bow angle velocity is given to the projectile so that the projectile traverses the shearing layer in a bowed posture, thereby greatly reducing adverse effects caused by the shear layer and improving the quality of the buried projectile body.