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采用数值模拟方法,对再生冷却通道和跨临界甲烷进行三维流动与传热耦合计算.采用经验公式模拟燃气侧对流和辐射换热,考虑跨临界甲烷物性随温度和压力的变化.所得结果表明:甲烷比定压热容、黏度、导热系数在冷却通道截面出现极值,阻碍其热量交换,流场分层、流速非对称明显;冷却通道温度沿径向减小,沿周向增加至通道中心达到最大,在肋根处热流密度最低.
Numerical simulation is used to calculate the coupling of three-dimensional flow and heat transfer between the regenerative cooling channel and the transcritical methane. Empirical formula is used to simulate the gas-side convection and radiative heat transfer, and the transmetaidal methane physical properties with temperature and pressure are considered.The results show that: The specific heat capacity, viscosity and thermal conductivity of methane show the extreme value in the cross section of the cooling channel, hindering the exchange of heat, the stratification of the flow field and the asymmetric flow rate. The temperature of the cooling channel decreases in the radial direction and increases to the center of the channel in the circumferential direction Reaching the maximum, with the lowest heat flux at the rib roots.