压缩空气储能系统膨胀机末级叶片特殊边界处理与失效分析

Special Boundary Treatment and Failure Analysis of the Last-stage Blade in the Expander of Compressed Air Energy Storage System

以压缩空气储能(CAES)系统中膨胀机末级叶片为研究对象,针对末级叶片的离心力工况,提出了一种高效的等效叶冠约束模型,并对比了循环对称约束模型和多叶片模型的仿真结果。同时,还开发了一种能够模拟弹塑性和失效行为的本构程序。结果表明:与其他模型相比,等效叶冠约束模型的仿真结果与全尺寸模型结果最接近,兼具精度和效率优势;所编写的本构子程序可有效模拟17-4ph钢的应力-应变响应曲线;针对所研究的叶片构型,当失效发生在叶片径向约1/4位置处时,失效区域快速扩大。

Taking the last-stage blades in the expander of compressed air energy storage(CAES)system as research object,based on centrifugal force conditions,an efficient equivalent crown constraint model was proposed and the simulation results of the cyclic symmetry constraint model and the multi-blade model were compared.Simultaneously,a constitutive program capable of simulating elastoplasticity and failure behavior was developed.Results show that compared with other models,the simulation results of the equivalent crown constraint model are close to the full-size model results,showing both precision and efficiency advantages.The written constitutive subroutine can effectively simulate the deformation-load response curve of 17-4ph steel.Specifically,when failure begins to occur at about 1/4 of the radial position of the blade,the failure area grows rapidly.