方管横向射流流动特性的DPIV实验研究  

DPIV EXPERIMENTAL STUDY OF SQUARE JET INTO CROSSFLOW

作　　者：吴海玲[1] 陈听宽[1] 罗毓珊[1] 宫武旗[2] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《化工学报》2003年第2期250-254,共5页CIESC Journal

摘　　要：Digital particle imaging velocimetry (DPIV) was used to me as ure the transient and time-averaged flow field in the mixing region and the wak e of a square jet into crossflow at jet-to-crossflow velocity ratio (VR) o f 0.5 and 2. The phenomenon of vortex instantaneously shedding from the jet ho le was investigated, and the flow turbulence intensity was estimated. The compl ex vortical structures encountered at VR of 2 were analyzed. Compulsively o ppressed by the main flow, the jet attached to the wall at VR of 0.5, and l ifted off the wall to develope into the main flow at VR of 2. The twisted v ortices in the leeward of jet contributed to the transportation of the crossflow boundary-layer fluid into the near wake, causing intensive turbulence. Strong vortices formed near the jet hole soon broke down and dissipated, yet the weak counter-vortex pair still held in the far wake.Digital particle imaging velocimetry (DPIV) was used to me as ure the transient and time-averaged flow field in the mixing region and the wak e of a square jet into crossflow at jet-to-crossflow velocity ratio (VR) o f 0.5 and 2. The phenomenon of vortex instantaneously shedding from the jet ho le was investigated, and the flow turbulence intensity was estimated. The compl ex vortical structures encountered at VR of 2 were analyzed. Compulsively o ppressed by the main flow, the jet attached to the wall at VR of 0.5, and l ifted off the wall to develope into the main flow at VR of 2. The twisted v ortices in the leeward of jet contributed to the transportation of the crossflow boundary-layer fluid into the near wake, causing intensive turbulence. Strong vortices formed near the jet hole soon broke down and dissipated, yet the weak counter-vortex pair still held in the far wake.

关 键 词：方管横向射流 流动特性 DPIV 实验研究 数字粒子图像测速 涡系结构 流场 

分 类 号：O358[理学—流体力学]