基于CFD分析的燃气轮机散热器数值仿真

为了改善燃气轮机的散热性能,以国产某型管带式散热器替换ΓТД-1250燃气轮机管片式散热器,建立了管片式和管带式散热器空气侧通道的稳态紊流数学模型,对2种不同类型散热器的阻力特性和表面传热特性进行CFD模拟,模拟结果与试验结果符合较好。数值仿真结果对比表明:散热器的压力降随冷却空气进口速度的增大而增大,且在相同的冷却空气进口流速下,管带式高出管片式散热器空气侧阻力的平均值约3.13%,同时管带式比管片式空气出口温度的平均值高出约6.29%。

Numerical Simulation of Gas Turbine Radiators Based on CFD

In order to improve the thermal performance of gas turbines, the domestic tube type radiator is used to replace ГТД-1250 gas turbine gilled tube radiator. A steady-state turbulent flow mathematical model of air side channel of gilled tube radiator and domestic tube type radiator is established for simula- ting the resistance characteristics and surface heat transfer characteristics of each type of radiators with CFD. The simulation result fits to the experimental result well. Through analysis and comparison of the simulation result, the conclusion is as follows ： radiator pressure drops with the increase of the cooling air inlet speed; with the same cooling air inlet flow rate, the air side resistance in the gilled tube radiator is about 3.13% higher than the average of that in the tube type radiator, while the air outlet average tem- perature of the domestic tube type radiator is about 6.29% higher than that of gilled tube radiator.