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建立微型燃气轮机CW(交叉波浪型,Cross Wavy)原表面回热器三维周期性充分发展数值计算模型,对芯体内传热和阻力特性进行了分析,确定了质量流量和温度水平对换热量及压降的影响,给出了CW原表面芯体板内阻力、传热因子以及努塞尔数与雷诺数之间的经验关联式。传热及阻力性能分析结果表明:随着雷诺数的增大,回热器芯体单元传热系数增大,传热量逐渐增加,并且随着低压高温烟气侧的进口温度升高,传热量增加幅度增大;回热器芯体单元回热度随雷诺数的增大而减小,随燃气进口温度升高而减小。
The three-dimensional periodic and fully developed numerical model of the micro-gas turbine CW (Cross Wavy) regenerator was established. The heat transfer and resistance characteristics of the core were analyzed. The effects of mass flow rate and temperature on heat transfer and Pressure drop, and gives the empirical relationship between the resistance, the heat transfer factor and the Nusselt number and the Reynolds number of the original CW core. The results of heat transfer and resistance analysis show that with the increase of Reynolds number, the heat transfer coefficient of regenerator core unit increases and the heat transfer increases gradually. With the increase of inlet temperature on the low pressure and high temperature flue gas side, The rate of increase of regenerator core unit decreases with the increase of Reynolds number and decreases with the increase of gas inlet temperature.