Experimental and large-eddy simulation studies on three-dimensional vortices produced by an impinging transverse Jet
The ow pattern and entrainment feature of highly three-dimensional vortices produced by an impinging jet in cross ow were investigated by means of LIF ow visualization, PIV measurement and LES computation. The distinctive vortex modes of the slightly skewed jet shear layer in the proximal region close to jet nozzle are identified mainly depending upon the velocity ratio between the jet and cross ow, namely changing from approximately axisymmetric mode to helical mode with the decreasing velocity ratios varying from 20 to 8. In the case of intense jet impingement upon the wall, the scarf vortex wrapped around the impinging jet in near-wall region is well reproduced showing somewhat asymmetry in respect of its bilateral spiral legs within near region. In addition, the entrainment of the ambient cross ow uid by the scarf vortex occurs in large part on the surface of the spiral roller structures of itself due to the presence of smaller and unorganized eddies.
PIV measurement large-eddy simulation impinging jet cross ow vortical structure
J.Y.Fan Y.Zhang D.Z.Wang
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072,China Key Laboratory of Advanced Display and System Applications (Shanghai University), Ministry of Educat
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）