PIV EXPERIMENTAL RESEARCH OF FLOW STRUCTURE IN RECTANGULAR CHANNEL WITH TRANSVERSELY PLACED SPIRAL COIL INSERT

作     者：TANG Yu-feng TIAN Mao-cheng ZHANG Guan-min 

作者机构：School of Energy Source and Power EngineeringShandong UniversityJinan 250061China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2012年第24卷第4期

页      面：518-525页

核心收录：

学科分类：090702[农学-森林培育] 080701[工学-工程热物理] 0907[农学-林学] 08[工学] 0807[工学-动力工程及工程热物理] 09[农学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：the Shangdong Province Key Scientific and Technological Project (Grant No.2008GG10007009) the Independent Innovation Foundation of Shandong University (GrantNo. 2009TS051) the Graduate Independent Innovation Foundation of Shandong University (Grant No.31380071613059) 

主　　题：Particle Image Velocimetry (PIV) spiral coil longitudinal vortices flow disturbance 

摘      要：The flow field in a rectangular channel with a transversely placed spiral coil insert is investigated by Particle Image Velocimetry （PIV） measurements in both transverse and longitudinal sections. The experimental results show that multi-longitudinal vortices are induced downstream of the spiral coil and are distributed as a symmetrical vortex array along the horizontal central line of the transverse section. Along the mainstream, due to the spiral motion of the longitudinal vortices, the velocity fluctuates in a manner of the damped sinusoidal curve and the velocity component in the wall normal direction is improved in the channel. Com- pared with the flow field in a smooth channel it is found that the movement of the longitudinal vortices can cause a continuous dis- turbance near the channel walls and thus enhances the fluid velocity in the near wall region, which consequently leads to the redu- ction of the velocity gradient and a more uniform velocity distribution. With the increase of the Reynolds number, the induced longitudinal vortices gain strength and become straighter and closer to the channel walls, thus the turbulence intensity is further enha- nced in this area.