球凹/球凸结构对小尺度通道换热影响研究

Study on the Influence of Spherical Concave/Spherical Convex Structure on the Heat Transfer of Small Scale Channels

对液体火箭发动机再生冷却通道中球凹/球凸结构进行数值模拟研究,讨论进口雷诺数Re in在2.2×104的情况下,球凹的不同深度和不同半径对通道流动和换热的影响。结果表明,当球凹深度H从0.1 mm增加到0.4 mm时,综合换热因子呈现先增大后减小的趋势,其中球凹深度在0.3 mm处,综合换热因子达到最大值1.4,相对于无球凹时增大了0.13;当球凹半径从0.3 mm增加到0.6 mm时,综合换热因子随着球凹半径增加而增加,在半径为0.6 mm时达到最大值1.41,相对于无球凹时增大了0.14。

The numerical simulation of the spherical convex structure with the embedded spherical concave in the regenerative cooling channel of the liquid rocket engine was performed with the discussion on effects of different depths and radius of the spherical concave on the internal flow and heat transfer of the channel with the Re in at 2.2×104.The results show that when the spherical depth H increases from 0.1 mm to 0.4 mm,the comprehensive heat transfer factor increases first and decreass later,when the depth of the spherical concave is 0.3 mm,the comprehensive heat transfer factor reaches a maximum value of 1.4,increasing by 0.13 compared with the case without spherical concave.When the spherical concave radius is up from 0.3 mm to 0.6 mm,the comprehensive heat transfer factor increases with the spherical concave radius.When radius is 0.6 mm,the maximum value is 1.41,0.14 larger than that when there is no spherical concave.