CAJ | 학술논문

本文采用LIF(激光诱导荧光)流动显示和PIV(粒子图像速度场仪)测量对横流冲击射流的尾迹涡结构进行了实验研究.水槽实验是在三种流速比和两种冲击高度实验工况下进行的.由实验结果可得到两种明显的尾迹涡结构,即射流尾迹涡和横流尾迹涡.横流冲击射流中形成的主要尾迹涡结构主要依赖于流速比.本文还对横流冲击射流近区范围内射流尾迹涡和横流尾迹涡的形成机理和演化特征进行了分析.
본문채용LIF(격광유도형광)류동현시화PIV(입자도상속도장의)측량대횡류충격사류적미적와결구진행료실험연구.수조실험시재삼충류속비화량충충격고도실험공황하진행적.유실험결과가득도량충명현적미적와결구,즉사류미적와화횡류미적와.횡류충격사류중형성적주요미적와결구주요의뢰우류속비.본문환대횡류충격사류근구범위내사류미적와화횡류미적와적형성궤리화연화특정진행료분석.
The wake vortices of an impinging jet in crossflow were studied experimentally by means of laser-induced fluorescence (LIF) flow visualization and particle image velocimetry (PIV) measurement.The experiments were performed at three jet-to-crossflow velocity ratios and two impingement heights in a water channel. Two kinds of distinctive wake vortices were identified from the experimental results,namely the jet wake vortices and the crossflow wake vortices. The dominant vortical structure in the wake of the impinging jet in crossflow is primarily dependent on the velocity ratio. The formation mechanism and evolving characteristics of the jet wake vortices and the crossflow wake vortices of the impinging jet in crossflow in near region were also discussed.