舰船排气系统红外抑制装置的湍流场及温度场分析

ANALYSIS OF THE TURBULENT FLOW AND THERMAL FIELDS WITHIN THE INFRARED SIGNATURE SUPPRESSION DEVICE OF A MARINE GAS TURBINE EXHAUST SYSTEM 

采用数值计算方法对舰船排气系统红外抑制装置内的湍流场和温度场进行了研究 .针对装置内部具有的耦合传热作用 ,采用整体求解法 .推导了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 .给出了引射处速度的确定方法 .与相应的实验结果比较表明 ,本文的数值处理方法及计算结果是可靠的 。

The flow and thermal fields within the infrared signature suppression(IRSS) device of a marine gas turbine exhaust system were investigated numerically. For the conjugate heat transfer within the device, an integrated solution method was adopted. The discretion 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 solution method of velocities at the entrance of secondary flow was presented. The numerical results agreed well with corresponding experimental data, which are the basis of the prediction of infrared radiation distribution of a marine gas turbine exhaust system.