基于流固耦合的导叶式离心泵强度分析

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Strength analysis of a difuser pump based on fluid-structure interactionLIU Hou-lin，XU Huan， Xian-fang，WANG Kai，TAN Ming-gao(Technical and Research Center of Fluid Machinery Engineering，Jiangsu University，Zhenjiang 212013，China)Abstract： The sequential coupling method and the strong fluid-solid coupling one were used to analyze the strengthof a diffuser pump.The static structural stress of an impeller was analyzed with the sequential coupling method，the resultswere compared with those using the strong fluid-solid coupling method.Then，the variations of equivalent stress in timedomain and in frequency domain for the maximum equivalent stress node A and the maximum deformation node B wereanalyzed when the impeller rotated one revolution.The results indicated that the maximum equivalent stress appears at thejunction of shroud，suction side of blade and outlet of the impeler；the streng failure may happen at the places with stressconcentration，for example，in the middle of inlet side of blade，the junction of inlet or outlet side of blade，shroud andhub；stiffness damage may take place in the middle of the impeller passageS outlet side with the maximum deformation；although the deform ation of the node A is less than that of the node B，the amplitude of the alternating stress of the nodeA is larger than that of the node B；the expanding velocity of fatigue fracture depends on the amplitude of the alternatingstress，SO the fatigue failure is easier to happen at the node A.The resuhs provided an effective reference for structuraloptimal design of impeler of a difuser pump。

Key words：fluid-structure interaction；diffuser pump；strength analysis；alternating stress流体机械可靠性研究的传统方法是通过对流体机械过流部件进行简化的静力分析来完成强度计算，忽略了流固耦合(Fluid-Structure Interaction，FSI)作用对流体机械可靠性的影响↑年来 ，流固耦合有限元析已成为分析流体机械可靠性的重要方法。流固耦不仅考虑了流体载荷对固体变形的作用，而