三角锥型纵向涡发生器强化换热性能数值分析

Numerical analysis of heat transfer enhancement performance of pyramidal longitudinal vortex generator

纵向涡发生器做为一种有效的被动式强化传热方法,因简单易于实现而得到广泛应用。文章采用三角锥型纵向涡发生器,通过FLUENT数值模拟软件对此纵向涡发生器的油浸式变压器散热片进行了数值模拟,分析研究了三角锥型纵向涡发生器攻角、高度及排列方式对变压器散热片散热能力的影响,并分析了影响机理。结果表明:自然对流情况下,在三角锥型纵向涡发生器的最佳攻角为90°和最佳高度为10 mm时,能够最大幅度提高自然对流换热效率,可提高其自然对流换热系数6.89%左右。

Longitudinal vortex generator is an effective passive heat transfer enhancement method. It is widely used because it is simple and easy to implement. The author put forward one kind of triangular tapered longitudinal vortex generator. Through three dimensional numerical simulations, the author studied the influence of angle of attack, the height and arrangement of the triangular pyramidal longitudinal vortex generators. By using oil-immersed transformer heat sink as the object, the author simulated the triangular tapered longitudinal vortex generator heat strengthening effect in state of natural convection. The results show that using the triangular pyramidal longitudinal vortex generators can significantly increase the cooling capacity of the heat sink of the oil-immersed transformer. The best angle of attack and the optimum height is 90~and 10mm. The increased natural convection heat transfer coefficient is about 6.89%.