中文摘要：

在控制方程中引入了组分传输方程的条件下,运用标准k-ε湍流模型对超声速空气流中二维平板上异质氮气侧喷流的稳态流场进行了数值仿真,分析了壁面静压、分离区长度、喷流穿透高度随侧喷流与来流滞止压强比的变化规律,并与理论计算及实验数据进行了比较分析。结果表明,欠膨胀喷流迅速膨胀形成的障碍物使自由来流分离,使流场出现分离激波、诱导激波、再压缩激波及漩涡等复杂形态,并在喷流出口前后壁面上分别形成高压和低压区;随着喷流与来流滞止压强比增加,分离区长度、喷流穿透高度、壁面高压区及低压区范围增大;仿真结果与理论计算、实验数据趋势吻合。

英文摘要：

On the condition of species transport equations having been added to the control equations, the steady flowfield resulting from heterogeneous nitrogen lateral jet at the surface of a two-dimension flat plate has been simulated using standard k-ε turbulent model, the impact of stagnation pressure ratio of lateral jet and freestream on the wall pressure, the separation region length and the penetrating height of lateral jet has been analyzed, and the numerical result has been compared with theory and experience. The result shows that the obstacle resulting from underexpand nitrogen lateral jet rapidly expanding induces freestream separation and complex flowfield which contains separation shock, induced bow shock, recompression shock and vortex etc. It also shows that there is a high pressure region and a low pressure region on the flat plate ahead and back of the injection slot. The separation region length, the penetrating height of lateral jet and the extent of high and low pressure region would be augmented with the increase of stagnation pressure ratio of lateral jet and freestream. The numerical result is in accord with theory and experience result.