Investigations for Flow Around slender bodies at high angles of attack

利用低速风洞流动可视化/测力试验和数值模拟相结合的方法，对细长体大迎角绕流及其气动特性进行了研究，主要结论如下：1.在60-75°攻角范围内，细长体绕流表现出不对称性，这是产生侧向力不对称的原因。对轴对称弹体有效的“攻角约为弹体锥角两倍的非线性气动特性”的经验定律也适用于非轴对称弹体。将前板安装在细长体上，在一定程度上缓解了不对称侧向力的产生，为空间运输系统的横向控制提供了可能。采用N-S分析可以在一定程度上模拟流动结构和气动特性。三维分离流的结构(节点、焦点、鞍座等)可以根据Navier-Stokes方程的计算结果进行数值求解。

Investigations for flow around the slender bodies at high angles of attack and the related aerodynamic characteristics are carried out with the use of both the flow visualization/force measurements in the low speed wind tunnel and the numerical simulation.The major conclusions are as follows:1. Flow around the axisymmetric bodies shows the asymmetries at angles of attack of 60-75 deg and it causes the asymmetric side force.2. The empirical law that "the nonlinear aerodynamic characteristics appears at angle of attack as approximately twice as cone angle of body" which is effective to axisymmetric body can be also applied to the non-axisymmetric bodies.3. When the foreplane is attached on the slender body, it somewhat alleviates the occurrence of asymmetric side force and demonstrates the possibility of application to lateral control of space transportation system.4. Flow structure and aerodynamic characteristics can be simulated in some extent with the Navier-Stokes analysis. The structures of the three-dimensional separated flow (nodes, foci, saddles, etc.) can be numerically obtained based on the computational results of Navier-Stokes equations.