微型燃气轮机CW原表面回热器芯体内传热及阻力特性分析  

Analysis of the Heat Transfer and Flow Resistance Characteristics Inside the Core Body of a Cross Wavy Primary Surface Recuperator in a Micro Gas Turbine

作　　者：桂小红[1] 闫润生 程言君 梁世强[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]轻工业环境保护研究所,北京100089

出　　处：《热能动力工程》2011年第5期518-522,628,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50976118)

摘　　要：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。With a 3-D periodically fully developed numerical calculation model for a cross wavy(CW) primary surface recuperator in a micro gas turbine being established,analyzed were the heat transfer and flow resistance characteristics inside the core body.Moreover,the influence of the mass flow rate and temperature on the heat quantity exchanged and the pressure drop was determined and the empirical correlation formula among the in-plate flow resistance,heat transfer factors,Nusselt number and Reynolds number of the CW primary surface recuperator was given.The heat transfer and flow resistance performance analytic results show that with an increase of the Reynolds number,the heat transfer coefficient of the recuperator core unit will increase and the heat transfer quantity will gradually increase.With a rise of the temperature at the inlet of the LP high temperature flue gas side,the extent of the increase in heat transfer quantity will grow.The recuperative degree of the recuperator core unit will decrease with an increase of the Reynolds number and the temperature of the gas at the inlet.

关 键 词：微型燃气轮机 CW原表面回热器 传热 阻力 周期性充分发展 

分 类 号：TK473[动力工程及工程热物理—动力机械及工程]