【摘要】 建立了舰船燃气轮机排气引射冷却系统的流动传热数学模型 ,并用数值方法对其进行计算 .采用扩大计算域的方法处理管内管外的混合流场问题 .推导了气固交界面上具有耦合传热时的控制体离散方程式 ,界面上的辐射热流以附加源项的形式出现在离散方程中 .把计算出的排气引射冷却系统出口截面上的压力值作为反馈信息 ,来调整二次流引射处的速度值大小 .与相应的实验结果比较表明 ,数值处理方法及计算结果是可靠的 .这些结果是进一步预测舰船排气系统红外辐射分布的基础 .更多还原

【Abstract】 The flow and heat transfer models of a marine gas turbine exhaust cooling system were established, and the numerical method were presented for the solution of the models. Since the problem considered here is a complicated process composed of the internal and external flow, an enlarged calculation domain was employed. The discretization equation was derived for the control volume with conjugate heat transfer at its interface, with the radiation heat flux at the interface appearing as an additional source term. The average calculated value of pressure at the outlet of the exhaust duct was taken as a feedback to determine the entrained velocities at the entrance of secondary flow. The numerical results agree well with the corresponding experimental data, which are the basis of the prediction of infrared radiation distribution of a marine gas turbine exhaust system.更多还原