Numerical investigation of the behaviour of confined, impinging jets with assessment of advanced concepts to reduce unsteady pressure fluctuations in gas turbine testing facilities

对受限冲击射流行为进行数值研究，评估先进概念，以减少燃气轮机测试设施中的不稳定压力波动

• 批准号: 520185-2017
• 负责人: Defoe, Jeffrey
• 金额: $ 2.43万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=696726
• 关键词: Numerical; investigation; behaviour; confined; impinging

Large test cells are used to evaluate the performance of modern jet engines. MDS Aero Support Corporation is a leading design and manufacturer of these test cells. They have observed large amplitude, low frequency unsteady pressure fluctuations on some of the components in the facilities when large engines are operated in them at high flow rates. These are significant enough to cause damage to the components over time. This leads to test cell downtime for repairs which is undesirable for MDS and their customers. This project will investigate approaches to reduce the unsteady pressure fluctuations and will also lead to new knowledge related to the air flow behaviour which gives rise to and governs the magnitude of the pressure fluctuations. The problem is related to jet impingement, but the geometry and flow speeds which are relevant have not been extensively studied in the past. To try to solve the problem, a two-pronged approach will be employed: on one hand, an investigation will be carried out to determine how changes to the shape of the components most directly affected by the pressure fluctuations can alter the fluctuation magnitudes; simultaneously a more fundamental study of the underlying physical processes at play will take place and this will yield design proposals for passive devices which could be added to the test cells to prevent or mitigate the pressure fluctuations. Both approaches will employ numerical simulations of the air flow in the test cell. In particular, a very accurate but complex simulation approach called Large Eddy Simulation will be used to capture the details of the relevant physical processes. Various design ideas and modifications will be assessed using these simulations to determine which have the most potential benefit, and why.

大型测试单元用于评估现代喷气发动机的性能。 MDS Aero Support Corporation是这些测试单元的领先设计和制造商。他们观察到在设施中某些组件的大幅度，低频率不稳定的压力波动，当时大型发动机以高流速运行。这些足够重要，可以随着时间的推移造成对组件的损害。这会导致测试单元停机时间进行维修，这对MDS及其客户不可能。该项目将调查减少不稳定压力波动的方法，还将导致与空气流动行为相关的新知识，该知识引起并控制压力波动的幅度。 该问题与喷气撞击有关，但是过去没有广泛研究相关的几何和流速。为了解决该问题，将采用两管齐下的方法：一方面，将进行调查，以确定如何直接受压力波动影响的组件形状的变化如何改变波动的幅度； 同时将进行对发挥作用的基本物理过程的更基本研究，这将为被动设备提供设计建议，这些建议可以添加到测试单元中，以防止或减轻压力波动。两种方法都将对测试单元中的空气流进行数值模拟。特别是，一种非常准确但复杂的仿真方法称为大型涡流模拟，以捕获相关物理过程的细节。将使用这些模拟来评估各种设计思想和修改，以确定哪些具有最潜在的好处，以及原因。