Digital Particle Imaging Velocimetre Experimental Study of the Jet-to-Crossflow in a T-Junction with a Sleeve Tube
Wu Hailing,Chen Tingkuan,Luo Yushan,Gong Wuqi
(School of Energy and Power Engineering, Xi'an Jiaotong University,Xi'an 710049,China)

Abstract：In order to understand the hydraulic mechanism of the thermal shock,which was caused by cold jet injection in a T-junction with thermal sleeve in the reactor cooling system,experiments were carried out on the jet-to-crossflow with a sleeve tube,using digital particle imaging velocimetre (DPIV) to measure the flow in the main duct and in the annular space of the sleeve tube.The velocity and vorticity distributions were investigated at the jet-to-crossflow velocity ratio R of 0.5～4.The complex vortical structures in the main duct,together with the flow characteristics in the sleeve annular were analyzed.It was found that,from the annular space at the rear part of the sleeve near the jet exit,there was a stream of discharge,which was in favor of decreasing the influence of the jet on the downstream wall.The intensive vortex in the near wake mainly originated from the shear layer vorticity of the jet in the hole and the annular discharge stream.It soon broke down and dispersed,and further developed into the counter-r
otating vortex pair in the far wake.The flow in the annular was closely dependant on R ,and the sleeve's thermal protection would be evident at higher R .
Keywords：jet-to-crossflow;sleeve tube;digital particle imaging velocimetry;vortical structure