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本文首先对“common flow down”(A形式)和“common flow up”(B形式)两种形式纵向涡发生器的流动换热性能进行了计算比较,发现B形式纵向涡发生器Nu数比A形式纵向涡发生器在计算范围内平均增大2.8%,而f因子却平均减少9.1%,这表明B形式纵向涡发生器是一种性能更加优异的强化传热表面方式;考察了B形式纵向涡发生器的几何参数对流动换热性能的影响,结果表明B形式纵向涡发生器空气侧Nu数与f因子随着攻角减小、高度h_(VG)增大、x_(VG)减小、y_(VG)减小而增大,而随着长度l_(VG)的增大Nu数先增大后减小,同样f因子随着长度l_(VG)的增大也先增大后减小。
In this paper, the flow and heat transfer performance of two forms of vertical vortex generators, “common flow down” (A form) and “common flow up” (B form), are calculated and compared. It is found that the B form longitudinal vortex generator Nu number ratio A form longitudinal vortex generator increases by an average of 2.8% in the calculation range, while the f factor is reduced by 9.1% on average, which indicates that the B form longitudinal vortex generator is a more excellent enhanced heat transfer surface mode; The results show that the Nu number and f factor on the air side of the B-type longitudinal vortex generator decrease with the angle of attack and the height h_ (VG) increases, while x_ ( VG) decreases and y_ (VG) decreases. Nu number increases first and then decreases with increasing length of V_ (VG). Similarly, as the length of V_G increases, Increase and decrease.