为分析火箭弹发射时弹筒间隙及壁面传热条件对燃气作用效应的影响,利用计算流体力学方法对不同条件下的燃气流动状态进行研究分析。结果表明:在弹体筒内运动阶段,弹筒间隙引射作用会对燃气流动状态产生较大影响,在弹体底部附近,忽略弹筒间隙时的燃气压强较考虑弹筒间隙时的压强小10%左右;对于等温壁面条件下燃气流动的压强较绝热壁面条件和耦合传热壁面条件的计算结果低5%左右。

To investigate effects of wall thermal conditions and small gaps between rockets and launch canisters on exhausted jets, a computational fluid dynamics (CFD) method was applied to simulate jet flows with different conditions. Results show that the small gaps between rockets and launch canisters influence the exhausted gas flows significantly with the rocket positioning in the canister due to the effect of ejected air from gaps. The maximum difference exists in the field near the nozzle outlet and the pressure error is about 10% between simulation models with or without gaps. The uniform temperature wall condition decreases the flow pressure and temperature about 5% referencing the models with adiabatic condition and coupled condition.