再入弹抛壳气动特性研究

本文用有限差分方法求解再入母弹头与其所抛壳体之间的无粘干扰流场,获得了体—壳的干扰气动力,并在准定常假设的基础上近似模拟了弹体与壳体的分离过程。数值研究的结果表明,体—壳间存在的干扰会导致壳的压心位置急剧变化,危及母弹安全;抛壳速度是体—壳安全分离的关键参数。

Numerical Investigation of Flow over Shrapnel/Shell Discarding Configuration

As a new attempt to numerically study the complex mul-tibody aerodynamics, Euler equations are solved in this paper, with the employment of NND difference scheme (a kind of TVD scheme) and the Overlapped Grid technique, to investigate the interfered supersonic flow field about a reentry shrapnel/shell discarding configuration. Computational results show the existance of strong aerodynamic interference between shrapnel corebody and the discarded shells, which causes their aerodynamic characteristics differing from that without any interference, and endangers the corebody and shells during their separation. In addition, the Overlapped Grid technique is much efficient in the multibody grid generation, and the NND scheme behaves Well in the calculation of inviscid flow with complicated wave system.