扩张率 meaning in Chinese

divergence ratio

With increasing convective mach number the streamwise fluctuation intensity varies little but the transverse and spanwise intensity along with the thickness growth rate decrease
随着对流马赫数的增加，流向脉动强度变化不大，横向和展向脉动强度减小，混合层的扩张率随之减小。
In the results of eight 2d simulation cases with convective mach number ranged from 0 . 2 to 1 . 0 the mean velocities and the thickness growth rates are in good agreement with experimental results , but the turbulent fluctuation intensities are larger
对对流马赫数从0 . 2到1 . 0的混合层的二维数值研究表明，平均速度分布和扩张率与实验结果相符合，但湍流脉动强度偏大。
The numerical results show that the flow - field structures and main features of the compressible mixing layer including the distribution of mean velocity , turbulent fluctuation intensities , reynolds stress and growth rates agree well with experimental and other numerical results
计算出的流场结构和主要的流动特征包括平均速度、湍流脉动强度和雷诺应力的分布以及混合层扩张率都同实验测量和其他时间发展数值模拟结果符合得很好。