宽高比对矩形喷管射流湍流强度影响试验  

Experimental investigation of jets turbulence intensity characteristics from rectangular nozzles with different aspect ratios

作　　者：张勃[1] 吉洪湖[1] 曹广州[1] 黄伟[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空动力学报》2010年第10期2244-2248,共5页Journal of Aerospace Power

摘　　要：采用热线风速仪对不同宽高比圆转矩形收敛喷管射流宽、窄对称面上的湍流强度进行了试验研究,得到其沿径向和轴向的分布特征,揭示了流体微团正向脉动变化规律.湍流强度沿径向逐渐减小,宽高比小于8时,随宽高比增加而提高,宽高比大于8后,略有减小.宽、窄对称面上的湍流强度分布规律相同;在射流中心线上,湍流强度沿轴向呈现增大趋势,宽高比小于8时,随着宽高比增大而提高,大于8后,湍流强度有所降低,分布规律不变.The distribution of turbulent intensity in the wide and narrow symmetrical planes of the jets from rectangular nozzles was experimentally investigated with hot-wire apparatus.The results show that the turbulent intensity decreases radially,and increases when AR（aspect ratio=W/H,W,nozzle width,H,nozzle height） of nozzle exits is smaller than 8,but decreases slightly when AR is bigger than 8.In the axis line,turbulent intensity increases slowly.The distributions are the same both in wide and narrow symmetrical planes,and the magnitude increases with AR,but decreases as AR is bigger than 8.

关 键 词：矩形喷管 射流 湍流强度 掺混 高宽比 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]