激波绕楔形物体的流场分析  

Analysis of flow field of shock wave passing by wedge

作　　者：王惠玲[1] 乐嘉陵[1] 吴颖川[1] 

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《实验流体力学》2006年第1期31-35,共5页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金资助项目(19889209)

摘　　要：使用数值计算方法和数值干涉技术并结合实验干涉图片,分析了激波过拐角绕楔形物体运动的流场。并采用数值彩色干涉技术,将数值计算结果转换为彩色条纹编码的数值干涉图,并与实验干涉图比较,可以辨识过激波发生跳跃后的干涉条纹的位移数,从而确定实验干涉照片的密度场。数值计算采用显式二阶迎风TVD格式。采用数值干涉技术将计算密度场转化成数值干涉图与实验干涉图进行了比较,检验了数值结果的可靠性。数值计算结果显示了包括激波、接触间断和旋涡在内的详细的流场结构,与实验相比,更为细致地刻画了流场演变过程的细节。通过数值计算结果观察到激波传播到旋涡中心附近并没有发生明显耗散,旋涡上半部的激波得到减速,下半部分的激波得到加速。Flow field of shock wave passing by right angle and wedge is analyzed using numerical method and numerical intederence technique combining with experimental intederegrams .The numerical results are converted into numerical colored interferograms through numerical colored interference technique. The displacement number of interference stripe after shock wave is confirmed by comparing numerical interferegram with experimental intederegram. Accordingly the density distribution of the experimental intederogram can be obtained. The second order explicit up- wind TVD scheme is applied in numerical calculation . The numerical density field is converted into numerical intederogram through numerical intederence technique. Intederograms of numerical and experimental are compared. The accuracy of numerical result is verified. The numerical figurea demonstrate a clear flow field includes shock wave, contact discontinuity and vortex. Compared with the experimental results the numerical results show the details of evolvement progress of flow field more carefully. That is observed that the shock wave is not dissipated evidently when propagating near the center of vortex through numerical results. The part of shock wave above vortex is decelerated and the part of shock wave below vortex is accelerated.

关 键 词：TVD格式 数值模拟 激波 数值干涉技术 实验干涉图 数值彩色干涉技术 

分 类 号：O241[理学—计算数学] O242[理学—数学]