摘要
采用热线风速仪对圆转矩形收敛喷管的射流流场与掺混特性进行了试验研究,测量了喷口下游不同截面上,射流宽、窄对称面上的速度、雷诺剪应力、湍流强度的分布规律.发现沿径向,雷诺剪应力先增大后减小,最大值出现在射流与外流的交界面附近,湍流强度则逐渐减小;在轴向上,雷诺剪应力在近喷口区存在小幅波动,而后逐渐减小,湍流度则先略有增大而后变化逐渐减慢.射流特性在宽对称面与窄对称面上的分布规律相同.
In order to measure the flow field and mixing characteristics of the jet from rectangular nozzle,the single incline hot-wire was used in the experiments.The results show that,the strongest mixing appears radially near the interface of ambient gas and jet,and causes the maximum value of Renaults shear stress in the same position,while the turbulent intensity decreases radially.Reynolds shear stress decreases axially,while turbulent intensity increases a little,and then decreases axially.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2009年第11期2476-2482,共7页
Journal of Aerospace Power
关键词
圆转矩形喷管
射流
雷诺剪应力
湍流强度
circle-rectangular transition nozzle
jet
Reynolds shear stress
turbulence intensity