摘要
为研究半球形多孔探针在超声速大气条件下产生脱体激波的形状和脱体距离随马赫数变化规律,采用CFD方法模拟大气环境,在1.2~1.7马赫数范围内进行数值仿真实验,用双曲线激波形状展示法和最小二乘法拟合得到了激波曲线离心率、脱体距离、曲率半径与马赫数间的函数关系,建立了脱体激波曲线参数化方程。将参数化方程与仿真结果和经验公式比较,结果证明,该参数化方程与仿真结果极为相符,且在距离球体较近处精度较高。参数化方程与经验公式预测的脱体距离差值不超过球体半径的5%。
In order to study the change law of the shape and standoff distance of the shock wave for hemispherical porous probe under supersonic atmospheric conditions,when the Mach number changes.CFD method was used to simulate the atmospheric environment,and numerical simulation experiments were carried out in the range of 1.2~1.7 Mach number.Hyperbola was used to represent the detached shock wave,and the functional relationship between the curvature,the standoff distance,the directrix distance of the shock wave and the Mach number was fitted by the least square method,and the parametric equation of the detached shock wave curve was established.The parametric equation is compared with the simulation results and the empirical formula,and the results show that the parametric equation is in good agreement with the simulation results,and the accuracy is higher when the distance is closer to the sphere.The difference between the distance predicted by the parametric equation and the empirical formula does not exceed 5%of the sphere radius.
作者
张阳春
周树道
姚韬
ZHANG Yang-chun;ZHOU Shu-dao;YAO Tao(College of Meteorology&Oceanography,National University of Defense Technology,Nanjing,Jiangsu 211101,China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,Jiangsu 210044,China)
出处
《计量学报》
CSCD
北大核心
2021年第7期866-872,共7页
Acta Metrologica Sinica
基金
国家自然科学基金(41775039,41775165)。
关键词
计量学
大气三维流场探测
半球形多孔探针
超声速
脱体激波
数值仿真
metrology
atmospheric three-dimensional flow field detection
hemispherical multi-hole porous probe
supersonic
detached shock wave
numerical simulation
