高精度ENO格式在喷管流动模拟中的应用

本文分析了ＥＮＯ格式的特点，并应用于Ｅｕｌｅｒ方程和全ＮＳ方程的迁移项和压力项，模拟了各种喷管流动。首先计算了ＪＰＬ喷管流动，取得了和实验一致的结果，分析了喷管内产生弱激波的原因；其次计算了非定常二维喷管流动，给出了相应的计算结果，并分析了壁面附近流场的拓扑结构；最后计算了摆动喷管的流动及推力矢量计算，取得了推力随摆角变化的规律，和实验结果表明基本一致。

Flowfield Calculation with High Resolution ENO

The third order ENO scheme has been applied to discrete convective terms and pressure terms of Euler equations and Navier Stokes equations, whose characteristics also have been analyzed. Seve ral kinds of nozzle flowfields have been calculated. The numerical results of JPL nozzle are same as experimental data of Jet Propulsion Laboratory. The reason of weak shock in the nozzles has been given. With 2D NS equations the unsteady flow in a 2D convergent divergent nozzle has been simulated. The separation induced by interaction of shock and boundary layer near the wall and its topology are presented. The flowfields and thrust vectors of swinging nozzles have been calculated under various swinging angles with 3D NS equations, the thrust vector distribution along various angles are same as experimental data.