【摘要】 针对射流控制元件的流场存在复杂激波与涡系时的特点,采用一种新的强紧致-ENO三点加权格式求解这类复杂的流场。该格式用于雷诺平均Navier-Stokes方程组,其对流项与粘性项分别采用三阶与四阶精度,湍流模式采用Realizableκ–ε模型,同时计算了7种工况。数值计算结果表明:使用该格式可以成功地捕捉到Coanda效应,即在无控制流条件下,当喉部总压低于临界值时,出现流动偏离现象。从计算结果中可看出回流区以及边界层的分离,而且可以高分辨率地捕捉到复杂的激波结构与涡系结构。计算得到的数值结果与试验值符合较好,显示了该格式的可行性与有效性,对指导射流元件的气动设计具有重要的意义。更多还原

【Abstract】 In view of the flow field of jet elements had the complex shock wave and the vortex characteristic. One kind of strongly compact—weighted ENO scheme is used for solving this kind of complex flow field. This form is applied to the Reynolds averaged Navier—Stokes equations, its convection term uses the third and fourth order, turbulence model uses Realizable κ–ε model, which has calculated 7 kinds of operating conditions. Numerical results indicated that using this scheme may succeed in capturing to Coanda effect, namely if the total pressure under the limiting value, departure of flow will occur when there is no control flow. The circumfluence and the separation of boundary can be seen distinctly, and the high order accurate complex shock wave and the vortex can be caught from the calculating results. Moreover, the numerical results are in good agreement with the experimental ones, which demonstrates that this scheme has feasibility and validity. This is essential to guide the design of jet elements.更多还原