高温空气传输特性对边界层稳定性及转捩预测的影响  

Effect of transport properties of high-temperature air on boundary layer stability and transition prediction

作　　者：万兵兵[1] 韩宇峰[1] 樊宇[1] 罗纪生[1] WAN Bing-bing HAN Yu-feng FAN Yu LUO Ji-sheng(Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, Chin)

机构地区：[1]天津大学机械工程学院力学系,天津300072

出　　处：《航空动力学报》2017年第1期188-195,共8页Journal of Aerospace Power

基　　金：国家自然科学基金(11332007);国家自然科学基金青年科学基金资助项目(11202147);高等学校博士学科点专项科研基金(新教师类)资助课题(20120032120007)

摘　　要：为了研究黏度和导热系数对边界层内基本流和流动稳定性的影响,首先通过分析比较Sutherland公式和目前常用的Gupta等人的拟合关系式,建立了高温气体下黏度和导热系数的计算模型,并分别将Sutherland公式和新建立的计算模型应用于7组元化学平衡流的平板模型,在马赫数为10,16和20,飞行高度为30.5km等条件下分别对黏度和导热系数的模型进行比较.计算结果表明:在高温范围内,黏度和导热系数均影响着边界层的基本流、流动稳定性及转捩预测,且两者影响的趋势相反,黏度的增加、导热系数的减小都能使扰动的增长率变大,增长区变宽,转捩位置提前.In order to study the effect of viscosity and thermal conductivity coefficient on the basic flow and flow stability in the boundary layer,the calculation model of the viscosity and thermal conductivity coefficient of high temperature gases was established by comparing Sutherland formula and Gupta fitting relation.Then Sutherland formula and the established model were applied to the 7-species air model for chemical equilibrium flow respectively,and these models were compared in flat-plate boundary layer of Mach number 10,16 and 20at the flight height of 30.5km.The calculation result shows that,within the high temperature range,the viscosity and thermal conductivity coefficient both affect basic flow,flow stability and transition prediction.The increase of viscosity can raise the disturbance growth rate,broaden the growth zone and advance the transition location,whereas the increase of thermal conductivity coefficient leads to opposite results.

关 键 词：黏度 导热系数 化学平衡流 流动稳定性 转捩预测 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]