轴对称湍尾流中的准相似性理论

本文应用准相似性理论，给出了不可压缩轴对称湍尾流的一级近似解。求解时，考虑连续性方程、平均运动方程以及忽略三阶关联项的二阶脉动速度关联方程，采用自模拟假设，并利用二次迭代，得出与实验较为符合的平均速度、二阶脉动速度关联项和湍流微尺度等的理论计算结果。

On the theory of pseudo - similatity in the turbulent axial symmetric wake flows

In this paper,the first approximation solution of incompressiable axis - symmetrical turbulentwake flow using theory of pseudo - similarity has been given. We consider the continuity equation,the mean motion equations and the equations of the double velocity correlations with ignoring thetriple velocity correlations correlation equations. We introduce the hypothesis of the self preservation,and have gotten the theoretical results of the mean velocities the double velocitycorrelations and the turbulent micro - scale,etc. by using the method of second substitution. Theyare identical with the experimental results.