2种角度横向紊动射流的实验分析  

Experimental Study on Turbulent Jets Injected Obliquely into a Crossflow

作　　者：郭婷婷[1] 徐忠[1] 李少华[2] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]东北电力学院动力工程系,吉林132012

出　　处：《西安交通大学学报》2003年第11期1207-1210,共4页Journal of Xi'an Jiaotong University

摘　　要：对射入均匀横流中的单股紊动射流流场进行了实验研究.利用IFA300型热膜风速仪系统测量了对称面内的流动,射流入射方向与横向主气流之间的角度为90°和60°,得到了射流与主气流速度比R为2和4的速度场和湍动能分布,并给出了不同工况下的射流轴线轨迹.结果表明:射流入射角与速度比对流场影响很大;射流对横向主气流的影响主要集中在射流发生弯曲直至与主气流平行的区域内,当射流垂直入射时,射流背风侧存在流动分离现象,当射流倾斜入射时,分离现象基本消失;当R值增大时,射流轨迹起始段的长度增加,对主流场影响的范围增大,射流入射方向与主气流之间的角度值减小,射流轨迹的垂直高度降低,射流对主流场影响的区域减小.Experimental investigations were performed to investigate the characteristics of the turbulent jet issuing into a uniform crossflow, at the injection angles of 90°and 60°. The experiments were conducted by IFA 300 anemometry and the flow fields were measured, and the mean and turbulent statistics were obtained at jetcrossflow velocity ratio R equaling 2 and 4. The jet trajectory was defined as the line linked by points of the maximal velocity in the centreplane, and the contours were given in different conditions. The results show that the injection angle and jetcrossflow velocity ratio can change the flow characteristics. The acute action between the jet and crossflow occurs mostly in the zone where the jet bends and the jet develops paralleling with the crossflow in the end, There are separate events in the lee of the jet injected normally, but these events are not obvious when the jet injection angle equals to 60°. The initial momentum of the jet is larger and the jet can change crossflow more under the condition of R equaling 4. The range affected by jet decreases when the injection angle is 60°.

关 键 词：横流 紊动射流 热膜风速仪 流场 

分 类 号：O356[理学—流体力学]