跨音速下旋成体干扰流场计算

Computation of Transonic Viscous - Inviscid Interactions on Axisymmetric Bodies With Stings

应用粘性-无粘性干扰方法计算了亚跨音速下旋成体的轴对称绕流流场,并着重研究了船尾处的后体流场.将流场划分为无粘的位流区和粘性影响集中的边界层区,利用有限差分法和积分关系式法分别求解之后,以边界层位移厚度为粘性匹配条件进行耦合计算,求出弹身表面的压力分布.该方法可直接用于计算导弹燃气喷流产生的“阻塞”效应对船尾-后体流场的影响。

A patched viscous-inviscid interaction method is used to predict the subsonic and transonic flow over an axisymmetric circular-arc boattail with a solid jet plume simulator. The complicated flow field in the vicinity of nozzle afterbodies was divided into two parts, namely an outer inviscid flow, and an inner viscous boundary - layer. Different computational methods are then applied to each region and the models are coupled into an overall interactive scheme by applying matching conditions consistent with weak - interaction theory. The outer inviscid flow is described by the finite -difference solution for the full potential equation, and the inner boundary - layer flow by the integral method. The numerical results are found to be in fair agreement with the available experiments.