【摘要】：汽輪機葉片葉根、輪槽連接區(qū)域常因加工誤差及磨損等原因?qū)е陆佑|狀態(tài)的改變,從而改變整個區(qū)域應力分布并大大降低汽輪機的使用壽命。本文運用數(shù)字光彈性技術實驗測試了長葉片葉根、輪槽在不同接觸狀態(tài)下的應力分布情況,同時結(jié)合有限元進行了仿真計算。結(jié)果表明,葉根、輪槽對稱接觸時,全部齒同時接觸的應力集中系數(shù)最小且分布較均勻;而當部分接觸齒產(chǎn)生間隙時,接觸狀態(tài)發(fā)生顯著變化,應力集中系數(shù)明顯增大;尤其是當左右齒非對稱接觸時,最大應力集中系數(shù)明顯增大且應力分布不均勻。本文研究可為葉根、輪槽的優(yōu)化設計、加工以及葉片的裝配、維護提供實驗依據(jù)。
[Abstract]:Because of machining error and wear, the contact state of turbine blade root and grooves is changed, which changes the stress distribution in the whole region and greatly reduces the service life of steam turbine. In this paper, the stress distribution of long blade roots and grooves in different contact states has been measured by means of digital photoelastic technique. At the same time, the simulation calculation has been carried out with finite element method. The results show that the stress concentration coefficient of all teeth at the same time is the smallest and the distribution is more uniform when the blade root and wheel grooves are in symmetrical contact, but the contact state changes significantly and the stress concentration coefficient increases obviously when the partial contact teeth produce clearance. Especially when the left and right teeth are in asymmetric contact, the maximum stress concentration factor increases obviously and the stress distribution is not uniform. This study can provide experimental basis for the optimization design, machining, assembly and maintenance of blade roots and grooves.
【作者單位】： 上海交通大學工程力學系;
【基金】：國家自然科學基金(11372182,11472267)資助
【分類號】：O348.1

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