接触状态对叶根轮槽应力分布影响的研究

发布时间：2018-10-26 21:03

【摘要】：汽轮机叶片叶根、轮槽连接区域常因加工误差及磨损等原因导致接触状态的改变,从而改变整个区域应力分布并大大降低汽轮机的使用寿命。本文运用数字光弹性技术实验测试了长叶片叶根、轮槽在不同接触状态下的应力分布情况,同时结合有限元进行了仿真计算。结果表明,叶根、轮槽对称接触时,全部齿同时接触的应力集中系数最小且分布较均匀;而当部分接触齿产生间隙时,接触状态发生显著变化,应力集中系数明显增大;尤其是当左右齿非对称接触时,最大应力集中系数明显增大且应力分布不均匀。本文研究可为叶根、轮槽的优化设计、加工以及叶片的装配、维护提供实验依据。
[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.
【作者单位】：上海交通大学工程力学系;
【基金】：国家自然科学基金(11372182,11472267)资助
【分类号】：O348.1

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