雷诺数对超声速气膜气动光学效应影响的实验研究

发布时间：2018-06-18 23:48

本文选题：气动光学 + 雷诺数　；参考：《红外与激光工程》2017年02期

【摘要】：受到风洞实验能力的限制,高速飞行器气动光学效应实验很难与其实际飞行情况完全一致。雷诺数作为重要的相似准则数,在经典流体力学风洞实验中应用广泛,研究其对于气动光学效应的影响,对于建立气动光学相似准则具有重要意义。基于∏定理对可能影响气动光学效应的变量进行分析,证明了雷诺数是影响气动光学效应的一个相似准则数;通过创新性设计变雷诺数实验装置,可以实现喷流单位雷诺数在106~108 m-1范围内变化。通过选取八个典型的雷诺数,并利用BOS-WS(BOSbased Wavefront Sensor)技术测量了对应状态的光程差,通过函数拟合的方法得到了光程差的均方根值与雷诺数之间的幂函数关系式。通过对不同孔径下的测量结果进行对比和归一化处理可以发现,对于二维超声速气膜而言,观察孔径尺寸并不会对获取的规律产生影响。
[Abstract]:Due to the limitation of wind tunnel experimental capability, it is very difficult for high-speed vehicle aerodynamic optical effect experiment to be consistent with its actual flight. Reynolds number, as an important similarity criterion, is widely used in wind tunnel experiments of classical hydrodynamics. It is of great significance to study the effect of Reynolds number on the aerodynamic optical effects and to establish the aerodynamic optical similarity criterion. Based on the analysis of the variables which may affect the aero-optical effect, it is proved that Reynolds number is a similar criterion number affecting the aero-optical effect, and the experimental device of varying Reynolds number is designed innovatively. The jet unit Reynolds number can be changed in the range of 106 ~ 108m ~ (-1). By selecting eight typical Reynolds numbers and using BOS-WSS-based Wavefront Sensor technique to measure the optical path difference of the corresponding states, the power function relationship between the root mean square value of the optical path difference and the Reynolds number is obtained by the method of function fitting. By comparing and normalizing the measured results with different aperture, it is found that the size of the observed aperture does not affect the obtained rule for the two-dimensional supersonic film.
【作者单位】：国防科学技术大学航天科学与工程学院;
【基金】：国家重大仪器研制项目(11527802) 国家自然科学基金(11172326,11302256)
【分类号】：V211.7

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