锥体后速度场与压力场的测量与分析

利用全流向十七孔压力探针，测量了Re=1.5×105与Re=3.0×105（基于锥体底面直径），攻角为0°，锥角为60°的圆锥体后流场速度与压力分布，并用烟线法进行了流场显示对比，得到了所述两种来流条件下锥体后流动速度场与压力场的详细实验测量数据.对速度与压力分布特征进行相关分析后，得到了两种来流条件下流场涡量ω与耗散熵产S_f云图.同时发现在两种来流条件下，锥体后流场可明显划分为3个区域.轴向速度V_z沿锥体轴线分布规律非常相似，均存在3个低速极值点，且锥体后流动驻点位置静压力均基本等于环境静压力. 

Measurement and Analysis of Velocity and Pressure Distribution Behind a Cone

The detailed measurements of velocity and pressure distribution behind a cone were obtained by using an omnidirectional 17-hole pressure probe. The cone angle is 60°, the attack angle is 0° and the inlet conditions are Re=1.5×105 and Re=3.0×105. The flow field was also visualized by smoke trace and compared with measurement result. Through the analysis of both the velocity and the pressure field, the distributions of vorticity and entropy production caused by viscous dissipation were obtained. For both the two inlet conditions, the distributions of axial velocity along the cone axis are exactly similar. Three low-speed extreme points were found, and one is over the stagnation point, the other two are under it. The flow field is easy to be divided into three subzones:main flow zone, shear zone, and inner-vortex zone. At the stagnation points of both the two flow fields, the static pressures are approximately equal to the environment static pressure.