高转速动力涡轮盘间螺栓连接结构稳健性分析  

Analysis and research on structural robustness of bolted connections between discs of high-speed power turbines

作　　者：白忠恺 孙凯 付仲议 杨哲夫 洪杰[3] BAI Zhongkai;SUN Kai;FU Zhongyi;YANG Zhefu;HONG Jie(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China;Hunan Key Laboratory of Turbomachinery on Medium and Small Aero-Engine,Zhuzhou 412002,China;School of Energy and Power Engineering,Beihang University,Beijing 102206,China)

机构地区：[1]中国航发湖南动力机械研究所,湖南株洲412002 [2]中小型航空发动机叶轮机械湖南省重点实验室,湖南株洲412002 [3]北京航空航天大学航空发动机研究院,北京102206

出　　处：《燃气涡轮试验与研究》2024年第2期55-62,共8页Gas Turbine Experiment and Research

摘　　要：针对动力涡轮间螺栓连接结构在实际工作载荷环境中可能出现的稳健性问题,提出了螺栓连接结构稳健性评估方法,分别从有效接触面状态系数、接触应力等方面评估连接界面在外载荷作用下的接触特性变化。以大功率涡轴发动机动力涡轮转子多级轮盘间螺栓连接结构为例,应用提出的连接结构稳健性评估方法,发现工作载荷环境下界面有效接触面积小于20%且最大接触应力超过500 MPa,稳健性较差。在此基础上,深入分析了3种典型几何构形对连接界面径向变形、角向变形、接触面状态及损伤的影响,总结了不同构形盘间螺栓连接结构的力学特性随转速的变化规律,凝练出盘间−螺栓连接结构在高转速下其连接稳健性更具优势。应用提出的稳健设计方案,对大功率涡轴发动机动力涡轮转子间螺栓连接结构进行优化设计及稳健性评估。结果表明:工作状态下界面有效接触面积占比超过65%,最大接触应力265 MPa仅为原始方案的1/2左右,验证了该方案在提高接触面状态系数和降低接触应力具有显著效果。In order to solve the robustness problem of bolt-connected structures between power turbines in an actual working load environment,a robustness evaluation method for bolt-connected structures was proposed.The contact characteristics of the interface under external loads were evaluated based on the aspects of effective contact area proportion and contact stress.Using the bolt-connected structure between the multi-stage discs of a certain high-power turboshaft engine’s power turbine rotor as an example,the proposed connection structure robustness evaluation method was applied.It was found that the effective contact area of the interface was less than 20%,the maximum contact stress was more than 500 MPa under the working load environment,and the robustness was poor.On this basis,an in-depth analysis was carried out on the influence of three typical geometric configurations on the radial deformation,angular deformation,contact surface state and damage of the connection interface,and the variation rules of the mechanical characteristics of the inter-disc bolt-connected structures with different configurations along with the rotational speeds were summarized.It was condensed that the inter-disc bolt-connected structure has more advantages in its connection robustness at high rotational speeds.Based on the proposed robustness design method,the optimal design and robustness evaluation of the bolt-connected structure between the power turbine rotors of a high-power turboshaft engine was carried out.The results show that the effective contact area of the interface is more than 65%,and the maximum contact stress of 265 MPa is only half of the original.This verifies that the robustness design method has a significant effect in improving the contact surface condition coefficient and reducing the contact stress.

关 键 词：螺栓连接 动力涡轮 稳健设计 高转速 接触面状态 损伤 航空发动机 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]