Experimental measurements of ingress and heat transfer in gas turbines

燃气轮机入口和传热的实验测量

• 批准号: 2124614
• 金额: --
• 依托单位: University of Bath
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2124614
• 关键词: Experimental; measurements; ingress; heat; transfer

The research is within the Turbomachinery Research Centre (TRC) at the University of Bath. It is an experimental project investigating ingress and heat transfer in gas turbines. A iCASE studentship has been provided by Siemens to support this project.Ingress in gas turbines is one of the most important of the cooling-air problems facing engine designers, and considerable international research effort has been devoted to finding acceptable design criteria. It occurs when hot gas from the mainstream gas path is ingested into the wheel-space between the turbine disc and its adjacent casing. Rim seals are fitted at the periphery of the system, and a sealing flow of coolant is used to reduce or prevent ingress. However, too much sealing air reduces the engine efficiency, and too little can cause serious overheating, resulting in damage to the turbine rim and blade roots.The Turbomachinery Research Centre (TRC) at the University of Bath has investigated the effects of ingress experimentally, theoretically and computationally over the last 11 years. This research has taken place in collaboration with Siemens across two highly successful projects jointly funded by the EPSRC. Both of these projects involved the design and manufacture of fully-instrumented rotating disc rigs used to study the effects of ingress in engine-representative gas-turbine wheel-spaces. In parallel with the experimental programmes, theoretical models developed at Bath have been used extensively in the analysis and interpretation of the measured data obtained from the rigs.It is proposed to expand this study to investigate the effects of ingress in a two-stage turbine stator well configuration, representative of a typical industrial engine design. Temperature measurements on the rotating disc surfaces will be used to determine the adiabatic effectiveness and heat transfer coefficients in the presence of ingress. Emphasis will be placed on translating experimental and analytical techniques from a separate project at Bath (EP/P003702/1) investigating heat transfer in compressor rotor discs. A theoretical model developed enables the steady-state Nusselt numbers, and their confidence intervals, to be accurately determined.Feasibility studies will be conducted using the existing Bath rotating rigs to develop ideas and instrumentation. The proposed project will, for the first time, apply new analysis methods and improved measurement technique capability to heat transfer tests on turbine discs. The PhD student is expected to assist a postdoctoral research associate in the design, construction and commissioning of the test rig, and take a leading role in conducting the experimental measurements. Temperature measurements on the rotating disc surfaces will be used to determine the adiabatic effectiveness and heat transfer coefficients in the presence of ingress.The successful completion and implementation of this research through improved engine design should result in a competitive advantage for Siemens.

这项研究是在巴斯大学的涡轮机械研究中心（TRC）内进行的。这是一个研究燃气轮机进气和传热的实验项目。西门子提供了一个iCASE奖学金来支持这个项目。燃气涡轮机的进气是发动机设计人员面临的最重要的冷却空气问题之一，国际上已经投入了大量的研究工作来寻找可接受的设计标准。当来自主流气体路径的热气体被吸入涡轮机盘和其相邻壳体之间的叶轮空间时，就会发生这种情况。在系统的外围安装有边缘密封件，并且使用冷却剂的密封流来减少或防止进入。然而，过多的密封空气会降低发动机效率，而过少的密封空气则会导致严重过热，从而导致涡轮机轮缘和叶片根部损坏。巴斯大学涡轮机械研究中心（TRC）通过实验、理论和计算研究了入口的影响在过去的11年里。这项研究是与西门子合作进行的，涉及由EPSRC共同资助的两个非常成功的项目。这两个项目都涉及全仪表化旋转盘试验台的设计和制造，这些试验台用于研究发动机代表性燃气涡轮机轴距中的进气影响。与实验方案并行，巴斯开发的理论模型已被广泛用于分析和解释从试验台获得的测量数据。建议将本研究扩展到研究两级涡轮机定子井配置中的入口效应，这是典型工业发动机设计的代表。旋转盘表面的温度测量将用于确定存在入口时的绝热有效性和传热系数。重点将放在从一个单独的项目在巴斯（EP/P003702/1）研究在压缩机转子盘传热的实验和分析技术的翻译。开发的理论模型使稳态努塞尔数及其置信区间能够准确确定。将使用现有的巴斯旋转钻机进行可行性研究，以开发思路和仪器。该项目将首次将新的分析方法和改进的测量技术能力应用于涡轮机盘的传热试验。博士生将协助博士后研究助理设计，建造和调试试验台，并在进行实验测量中发挥主导作用。旋转盘表面的温度测量将用于确定存在进气时的绝热有效性和传热系数。通过改进发动机设计成功完成和实施这项研究将为西门子带来竞争优势。