圆弧端齿对涡轮螺栓连接影响的数值研究

为验证某型民用航空发动机涡轮总体设计方案的可行性和安全性,以该型航空发动机涡轮的圆弧端齿连接结构为研究对象,利用有限元数值模拟方法研究了涡轮第1级盘与前轴之间采用圆弧端齿连接的设计对结构强度和疲劳失效的影响,分析了在高温及不同预紧力载荷工况下对圆弧端齿连接强度、疲劳等性能的影响规律.研究表明:该设计存在涡轮第1级盘与高压涡轮轴连接的外端齿分离而导致振动的风险,而增大预紧力可以提高螺栓连接传递荷载的能力,但螺栓孔边存在局部高应力问题.研究结果为圆弧端齿的设计方案提供了有效理论支撑和参考.

Numerical Study on the Influence of Curvic Couplings on Turbine Bolt Connection

In order to verify the feasibility and safety of a certain type of civil aviation turbine engine overall design scheme, turbine curvic couplings syndeton in the aero engine was set up as the research object. Using finite element numerical simulation method, the influence of the curvic couplings on structure strength and fatigue failure was carried out, and the influence law of the strength and fatigue properties of the curvic couplings under high temperature and different pretightening force load were analyzed between the first stage turbine disk and the front axle. Results show that the end of the tooth of the first stage turbine disc connected to the high-pressure turbine shaft may separate and then cause risk of vibration, and the preload increasing improves the ability of the bolt connection of load transfer, but local high stress problems occur on the bolt holes. The result also provide an effective theoretical support and reference for the design of the curvic couplings.