旋转受限层板中隔板对层板流动换热的影响

采用数值模拟的方法,研究了旋转受限层板结构中隔板对层板中冷却气体流动换热的影响机理.结果表明:隔板结构能够有效地提高层板的换热能力,旋转受限层板比不受限横流冲击层板的Nu高18%,比不受限横流冲击出流层板的Nu高15%.隔板导热条件下比绝热条件下的层板的Nu提高10%~15%.在旋转受限层板中,冲击孔靠近旋转中心一侧换热能力随着旋转数的增加而降低,冲击孔远离旋转中心一侧换热能力随着旋转数的增加而增加.旋转的加入,可以有效地降低靶面上由于隔板的加入而导致的高温区的温度,旋转受限层板更适用于涡轮动叶.

Effect of baffle plate of rotating limited lamilloy on flow heat transfer of lamilboy

Using numerical simulation method, the effect of baffle plate on the flow heat transfer capacity of coolant air in rotating limited lamilloy was researched. The results show that the heat transfer capacity of lamilloy is enhanced evidently by baffle plate. Nu of the rotating limited lamilloy is 18% higher than that of unlimited transverse flow impact lamilloy, and 15% higher than that of the unlimited transverse flow impact lamilloy. The Nu in heat conduction baffle plate is 10% to 15% higher than that in heat insulation baffle plate. In the rotating limited lamilloy, the heat transfer capacity declines with the increase of the rotation number of impingment hole close to the rotating center, and increases with increasing rotation number of impingement hole far away from the rotating center. Rotation can effectively reduce the temperature of high temperature regions of the target surface because of the baffle plate. Rotating limited lamilloy is more suitable for turbine rotor.