不同纵向涡发生器翅片通道内速度场与温度场协同的数值研究

Numerical Analysis of Synergy Between Velocity Field and Temperature Field in Finned Tubes With Different Longitudinal Vortex Generators

为了探究加装矩形小翼和三角型小翼纵向涡发生器的H形翅片通道的换热流动,采用场协同理论进行分析.结果表明,相同攻角时,三角形小翼的面平均协同角和体平均协同角要比矩形小翼的大,同时,体平均协同角比面平均协同角大;随着攻角的增大,面平均协同角和体平均协同角都先减小后增大,矩形小翼在攻角为60°时最小,三角形小翼在45°时最小;相同进口速度时,45°三角形小翼的面平均协同角和体平均协同角要比60°矩形小翼的大,随着进口速度的增加,60°矩形小翼和45°三角形小翼的面平均协同角和体平均协同角都增大.

In order to explore the comprehensive properties of heat convection in H-type finned tubes installed with small rectangular wings or triangular wings as the longitudinal vortex generators,the field synergy principle was adopted in analysis. At the same attack angle,the surface average and volume average synergy angles of the small triangular wings are bigger than those of the small rectangular wings; at the same time,the volume average synergy angles are bigger than the surface average ones. With the increase of the attack angle,both the surface average and volume average synergy angles decrease first but increase later,which reach their minimum values at the 60° attack angle for the rectangular wings but at the 45°attack angle for the triangular wings. At the same inlet velocity,both the surface average and volume average synergy angles of the 45°-attack-angle triangular wings are bigger than those of the 60°-attack-angle rectangular wings. With the increase of the inlet velocity,both the surface average and volume average synergy angles increase for the 60°-attack-angle rectangular wings and the 45°-attack-angle triangular wings as well.