Heat transfer characteristics of rectangular straight channel enhanced by curved streamline vortex generator
The longitudinal vortex generator is widely used as an effective passive heat transfer enhancement method.Vortex generators enhance the mixing between fluids by generating vortex motion,thereby improving heat transfer performance,but also generating flow resistance.Therefore,the development of longitudinal vortex generators with lower resistance and better overall performance is a research focus in this field.The geometric structure and placement position of the vortex generator are important factors affecting its comprehensive heat transfer performance.In this work,a curved streamline winglet pair(CSWP)vortex generator is proposed to improve the performance of the streamline vortex generator.The heat transfer characteristics in the rectangular straight channel where the curved streamline winglet pair vortex generator is installed are studied by numerical simulation,and the comprehensive strengthening effect of the curved streamline winglet pair vortex generator is evaluated.The influence of the shape,quantity,and installation position of the curved streamline winglet pair vortex generator on the heat transfer performance is investigated.The results show that in the range of Re=4000～26 000,compared with the plane delta wing winglet pair(PDWP)vortex generator,the curved vortex generator can effectively reduce the flow resistance,so it has a higher overall heat transfer performance.Compared with curved rectangular winglet pair(CRWP)and curved trapezoidal winglet pair(CTWP)vortex generators,CSWP vortex generators have better comprehensive strengthening effects.When the angle of attack is constant,the smaller the inclination angle of the leading-edge of the vortex generator,the more the quantity,and the better the comprehensive strengthening effect.The CSWP vortex generator has a streamline structure of the leading-edge that can significantly reduce the flow resistance and improve the synergy between the velocity field and the temperature field,which is the reason for its high comprehensive strengthening effect.
vortex generatorcurved streamline winglet pairheat transfer enhancementrectangular channelfield synergy principle
万方数据
维普
