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实验研究了方形通道这一重型燃气轮机中常用叶片强制对流冷却通道结构.分析了雷诺数、壁面热流密度以及水雾质量流量比等关键参数对汽雾冷却通道的传热特性的影响,并建立了考虑离散相水雾的流动工况和通道壁面加热条件的实验关联式.结果表明:相对于纯蒸汽,汽雾两相流的传热系数显著提高,且传热性能提高的幅度随热流密度的增大而减小,随雷诺数和水雾质量流量比的增大而增大;通道上壁面平均传热系数低于下壁面,在高热流密度和低水雾质量流量比下,两者相差约13%,而在低热流密度与高水雾质量流量比的情况下,该比值增加到约25%.
The effect of the key parameters such as Reynolds number, wall heat flux density and mass flow ratio of water mist on the heat transfer characteristics of the aerosol-cooling passage was analyzed and a Considering the experimental correlation between the flow conditions of the discrete phase water mist and the heating conditions of the channel wall, the results show that the heat transfer coefficient of the gas-mist two-phase flow significantly increases with the increase of the heat flux Increases with the increase of Reynolds number and the mass flow ratio of water mist; the average heat transfer coefficient of the upper wall of the channel is lower than that of the lower wall surface, and under the condition of high heat flux density and low water mist mass flow ratio, About 13%, whereas at low heat flux and high water mist mass flow ratios, the ratio increases to about 25%.