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Multidisciplinary methodology for turbine overspeed analysis

机译：涡轮超速分析的多学科方法

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In this paper, an integrated approach to turbine overspeed analysis is presented, taking into account the secondary air system dynamics and mechanical friction in a turbine assembly following an unlocated high-pressure shaft failure. The axial load acting on the rotating turbine assembly is a governing parameter in terms of overspeed protection since it governs the level of mechanical friction which acts against the turbine acceleration due to gas torque. The axial load is dependent on both the force coming from secondary air system cavities surrounding the disc and the force on the rotor blades. It is highly affected by secondary air system dynamics because rotor movement modifies the geometry of seals and flow paths within the network. As a result, the primary parameters of interest in this study are the axial load on the turbine rotor, the friction torque between rotating and static structures and the axial position of the rotor.Following an initial review of potential damage scenarios, several cases are run to establish the effect of each damage scenario and variable parameter within the model, with comparisons being made to a baseline case in which no interactions are modelled. This allows important aspects of the secondary air system to be identified in terms of overspeed prevention, as well as guidelines on design changes in current and future networks that will be beneficial for overspeed prevention.
机译：在本文中，提出了一种集成的涡轮超速分析方法，其中考虑了未定位的高压轴故障后涡轮组件中的二次空气系统动力学和机械摩擦。就超速保护而言，作用在旋转涡轮组件上的轴向载荷是一个控制参数，因为它控制着机械摩擦力的水平，该摩擦力抵消了由于气体扭矩引起的涡轮机加速。轴向载荷既取决于来自围绕圆盘的二次空气系统腔的力，又取决于作用在转子叶片上的力。它受二次空气系统动力学的影响很大，因为转子的运动会改变网络中密封件和流动路径的几何形状。因此，本研究中感兴趣的主要参数是涡轮机转子的轴向载荷，旋转和静态结构之间的摩擦转矩以及转子的轴向位置。在初步审查潜在的损坏情况之后，运行了几种情况以确定模型中每个损坏场景和变量参数的效果，并与未建模任何交互作用的基准情况进行比较。这样就可以根据防止超速以及当前和未来网络中设计变更的指导原则来识别二次空气系统的重要方面，这将有助于防止超速。

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