多级汽轮机低压级叶片固体颗粒冲蚀特性研究  被引量:2

Study on Solid Particle Erosion Characteristics of Low-pressure Stage Bladesof Multi-stage Steam Turbine

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作  者:吕世超 王坤[1] 鲁录义[1] 周桂平 LYU Shi-chao;WANG Kun;LU Lu-yi;ZHOU Gui-ping(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Grid Liaoning Province Electric Power Co.,Ltd.,Shenyang 110000,China)

机构地区:[1]华中科技大学能源与动力工程学院,武汉430074 [2]国网辽宁省电力有限公司,沈阳110000

出  处:《汽轮机技术》2021年第6期435-439,共5页Turbine Technology

基  金:国家重点研发计划(No.2019YFB1505400)。

摘  要:汽轮机是火电及核电普遍采用的原动机,在汽轮机运行过程中叶片经常受到固体颗粒物的冲击和冲蚀,严重时可能会影响到汽轮机的安全和经济运行。核电多级汽轮机内颗粒在冲蚀时具有复杂的多次反弹现象,通过数值模拟方法对低压多级汽轮机中固体颗粒物在湿蒸汽环境下的运动、反弹及蒸汽湿度对冲蚀的影响进行了研究,结果表明,颗粒在动静叶之间的反弹所造成的冲蚀现象不可忽视,且主要发生在第一级叶片;速度及粒径越大的颗粒惯性力较大,造成的最大冲蚀量数值虽小但冲蚀区域更大,叶片受到的冲蚀趋于均匀。Steam turbines are widely used as prime movers in thermal power and nuclear power.During the operation of steam turbines,blades are often impacted and eroded by solid particles,which may affect the safe and economic operation of steam turbines in severe cases.The particles in nuclear power multi-stage steam turbine have complex multiple rebound phenomena during erosion.In this paper,the movement and rebound of solid particles in low pressure multi-stage steam turbine in wet steam environment and the influence of steam humidity on erosion are studied by numerical simulation.The results show that the erosion phenomenon caused by the rebound of particles between the stator and rotor blades can not be ignored,and mainly occurs in the first stage blades.The larger the velocity and particle size,the larger the inertial force of particles,and the smaller the maximum erosion amount,the larger the erosion area,and the erosion of blades tends to be uniform.

关 键 词:多级汽轮机 低压级 湿蒸汽 固粒冲蚀 固粒反弹 

分 类 号:TK263[动力工程及工程热物理—动力机械及工程]

 

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