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带鳍状凸肩结构汽轮机叶片的接触分析

Keywords: 汽轮机叶片,鳍状凸肩,接触分析,有限元方法

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Abstract:

为了研究大型汽轮机叶片旋转过程中鳍状凸肩间的接触状态,利用拉格朗日增广算法,采用三维有限元模型,计算了考虑摩擦情况下的凸肩间接触压力的变化情况,得出了接触压力与转速之间的关系,并计算了3000r/min下整圈叶片的固有频率.计算表明:当叶片转速达到400r/min时,鳍状凸肩开始接触,此后随着转速的增加,鳍状凸肩间的接触压力逐渐增大,接触面积不断扩大;当转速为1825r/min时,接触压力增加程度明显趋缓;转速为3000r/min时接触压力最大(700MPa),鳍状凸肩间的实际接触面积为设计接触面积的1/4左右.

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