径向湍流旋转射流的计算研究

COMPUTATION OF RADIAL TURBULENT SWIRLING JET FLOW

本文对径向湍流旋转射流作了计算研究,考察了边界条件的不同取法对计算结果的影响,并与过去国外学者发表的实验结果作了比较讨论,再次证明边界条件的适当改变,对射流的渐近扩张速率有明显的影响,也有助于流场其它参数（如雷诺应力,脉动速度）预测的改善。同时我们也看到:（1）由于实验数据的误差;（2）也由于流场上游的边界条件不是实验测量的,除了湍流结构系数Y12F是作者凭经验估计的以外都是用的文献[2]的计算结果; （3）由于平均流动定常的假定;湍流应力的预测,特别是左边半幅和uw,还不理想。

A radial swirling turbulent jet has been computed with different boundary conditions used, and compared with the experimental data of the reference. It is checked again that the upstream conditions of the turbulence structure have obvious effects to the spreading rate of the swirling jet and other flow field characters. However, it is also found that there are several possible reasons that may affect the predictions of the stresses, especially the uw and at the left hand: (1) experiment errors; (2) the upstream conditions are all taken from the calculation results of Ref.[2], except the Y12F is assumed by the author. (3) the steady flow assumption may have to be abandoned in the future research.