【摘要】 采用Ｄｕａｌ　ＰＤＡ研究了２种射流交叉角度和４种密度比的同轴交叉射流的流场，发现射流交叉角度和密度比对射流流场有重要影响。提出了考虑了径向流动速度、密度差别的基于动量守恒的当量直径和当量速度。当量速度与实验结果较为吻合．对充分发展的射流，该法可较好的描述射流交叉角度、密度比对轴线上轴向速度的影响。更多还原

【Abstract】 The coaxial cross jets flow field with two different angles of cross jets and four density ratios has been investigated with Dual PDA. The results show that the angle of cross jet and density ratio have important influence on the flow field. A new equivalent diameter and equivalent velocity based on momentum conservation were presented. The equivalent velocity agrees well with experimental data. This method can be used to describe the effect of angle of cross jets and density ratio on axis velocity of fully developed jet flow.更多还原