超临界汽轮机中压透平级流动传热特性研究  

Flow and Heat Transfer Characteristics in Middle Pressure Turbine Stage in Supercritical Steam Turbines

作　　者：霍文浩[1] 祁明旭[2] 李军[1] 丰镇平[1] 

机构地区：[1]西安交通大学叶轮机械研究所,西安710049 [2]北京理工大学机械与车辆学院,北京100081

出　　处：《西安交通大学学报》2011年第7期9-14,共6页Journal of Xi'an Jiaotong University

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-07-0699)

摘　　要：通过采用耦合流场计算和共轭传热的数值方法,研究了超临界汽轮机高压缸冷却蒸汽对中压缸第一级固体部件的冷却特性及其对级气动性能的影响,同时对比了有无蒸汽冷却的中压缸第一级的流场和温度场.结果表明:蒸汽冷却技术可以有效地对中压缸第一级动叶叶片、叶根、转子及轮盘进行冷却.受到冷却孔的抽吸作用而进入冷却孔的冷却蒸汽对冷却孔及周围的叶根区域具有明显的冷却作用.在蒸汽冷却的作用下,中压缸第一级转子系统温度下降的最大幅度达80 K.部分冷却蒸汽进入中压缸第一级叶栅主流道并与主流掺混,从而使得根部反动度增大,动叶通道涡强度增加.所以,蒸汽冷却技术可以有效提高高温转子的运行寿命和安全的可靠性.The coupling of the flow field calculation and the conjugate heat transfer method was employed to investigate the cooling characteristics of the steam from the high pressure cylinder of a supercritical steam turbine to cool the solid parts of the first stage in the middle pressure cylinder and the influence of the cooling effect on aerodynamic performance of the first stage.The flow field and the temperature field in the first stage of the middle pressure cylinder with steam cooling were compared with those without steam cooling.The results show that the steam cooling technology can effectively reduce the temperature of the rotor blade,blade root,rotor and wheel disc of the first stage.The cooling steam flowing through the cooling holes by pumping action of the cooling holes has obvious cooling effect on the cooling holes and their surrounding area.The temperature of the rotor system of the first stage in the middle pressure cylinder decreases by up to 80 K.In addition,part of the cooling steam enters the main flow passage of the first stage and mixes with the main flow,leading to greater hub reaction and strength of the passage vortex.

关 键 词：超临界汽轮机 中压转子 蒸汽冷却 数值模拟 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]