椭圆形扰流柱冷却通道流动与换热数值研究

采用数值计算方法对涡轮叶片椭圆形扰流柱排冷却通道的流动和换热进行了研究,得到了排列间距、迎角、椭圆长短轴之比等因素对冷却通道流动和换热性能的影响.在相同截面积和排列方式条件下,椭圆形扰流柱迎角为0°时,分析结果表明,椭圆形扰流柱冷却通道压力损失系数约为圆形扰流柱通道的51.7%,平均努塞尔数约为圆形扰流柱通道的83.75%;长短轴比为5/1.8时,压力损失系数仅为圆形扰流柱通道的(长短轴比等于3/3)28.1%～35.5%,平均努塞尔数为圆形扰流柱通道的71.1%～75.06%.

Numerical simulation on flow and heat transfer of elliptical pin-fins in cooling channel

Numerical simulation is conducted to investigate flow and heat transfer performance of elliptical pin-fin arrays in turbine blade cooling channel. Then the impacts of array spacing, angle of attack, ratio of long axis and short axis on flow and heat transfer in pin-fins channel are obtained. The result indicates that as angle of attack is 0°,pressure loss coefficient and average Nusselt number of elliptical pin-fins channel is about 51.7% and 83.75% of the same fin section-area and arrays circular pin-fins channel respectively; When ratio of long axis and short axis is 5/1.8, pressure loss coefficient is only 28.1%-35.5% of circular pin-fins channel (ratio of long axis and short axis is 3/3), and average Nusselt number is 71.1%-75.06% of circular pin-fins channel.