高温空气传输特性对边界层稳定性及转捩预测的影响

发布时间：2018-01-02 07:36

本文关键词：高温空气传输特性对边界层稳定性及转捩预测的影响　出处：《航空动力学报》2017年01期 　论文类型：期刊论文

【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.
[Abstract]:In order to study the effect of viscosity and conductivity of the boundary layer in the basic flow and flow stability, first through the analysis and comparison of the Sutherland formula and the commonly used Gupta's formula, established the calculation model of high temperature gas viscosity and thermal conductivity, and flat model Sutherland formula and a new calculation model is applied to 7 element chemical equilibrium flow, the Maher number is 10,16 and 20. The flying height of 30.5km under the conditions of viscosity and thermal conductivity models were compared. The results show that the high temperature range, viscosity and thermal conductivity are affected by the basic flow boundary layer, flow stability and transition prediction, and their influence the opposite trend, the increase of viscosity, the thermal conductivity can make the disturbance growth rate becomes larger, the growth area becomes wider, the transition position in advance.

【作者单位】：天津大学机械工程学院力学系;
【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)
【分类号】：V211
【正文快照】： 引用格式:万兵兵,韩宇峰,樊宇,等.高温空气传输特性对边界层稳定性及转捩预测的影响[J].航空动力学报,2017,32(1):188-195.WAN Bingbing,HAN Yufeng,FAN Yu,et al.Effect of transport properties of high-temperature air on boundary lay-er stability and transition predi

【相似文献】