摘要
利用ＰＩＶ技术测量了射流流场，得到了自由射流核心区的瞬时速度场，并对实验结果进行了分析总结。比较了射流出口雷诺数分别为２３００及３５００时流场的实验结果。在低雷诺数情况下，射流的边界层较薄，展向尺寸较小，随着出口雷诺数的增高，射流边界层明显增厚，展向尺寸也更快地增大。
The flow field of free jet was measured by PIV. The instantaneous velocity vectors of the core region of jet was studied experimentally. The measurement results in different Reynolds numbers 2300,and 3500 are compared. The thickness of boundary layer is thin and the spanwise size of jet is smaller in the core region of jet at the lower Reynolds number. The growth of thickness of boundary layer obviously depends on the Reynolds number. The spanwise size of jet are more rapidly growing.
基金
航天基金
