Flow and heat transfer in complex film cooling configurations for application in future gas turbine combustors

复杂薄膜冷却配置中的流动和传热，适用于未来燃气轮机燃烧室

基本信息

批准号：
239213895
负责人：
Professor Dr. Michael Pfitzner
金额：
--
依托单位：
Institut für Thermodynamik (LRT-10)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/239213895?language=en
关键词：
Flow heat transfer complex film

项目摘要

Combustor cooling concepts for future gas turbine combustors must operate with a minimum amount of cooling air at maximum cooling efficiency. When using the low emission lean combustion technology, most of the air is required in the fuel injector, while at the same time the hot gas temperatures continue to rise in order to obtain maximum gas turbine process efficiency. When using effusion cooling, a liftoff of the cooling air jets and a reduction of the film cooling efficiency occurs especially at high blowing rates, which are typical of gas turbine combustion applications. In new cooling configurations like the trench cooling, where the cooling air from the effusion jet is distributed laterally, this lift-off effect is reduced considerably and can result in a considerably improved film cooling efficiency by one order of magnitude for some operating conditions.The goal of the proposed research project is to develop a deeper physical understanding of the detailed flow and heat transfer phenomena that occur in effusion cooling as compared to trench film cooling configurations by a combination of experimental and numerical investigations. The emphasis will be on the investigation of the complex unsteady flow, mixing and heat transfer processes in trench cooling configurations, which are not well understood. Using the generated results, optimized film cooling devices can be developed which feature a uniform and (for a large range of operating conditions) robust cooling film at minimal use of cooling air.The experimental research will use optical non-intrusive measurement technology (PIV - PIV, infrared temperature measurements, temperature-sensitive colors - TSP), supplemented by hot-wire and thermocouple measurements. Through use of high-speed PIV, the complex unsteady flow structures can be examined in great detail. A novel combination of infrared and TSP measurement techniques for measuring wall heat flows allows the determination of the local distribution of the heat transfer coefficient.The CFD simulations accompanying the experiment are performed using a commercial CFD code (FLUENT with realizable k-epsilon model). For the detailed numerical studies of the large scale unsteady flow structures, large eddy simulations will be performed using the open source CFD code OpenFOAM, which is already well established at the institute.

未来燃气轮机燃烧器的燃烧器冷却概念必须在最大的冷却效率下以最少的冷却空气运行。当使用低排放精益燃烧技术时，喷油器中需要大部分空气，同时，热气温度继续升高，以获得最大的燃气轮机工艺效率。当使用排放冷却时，冷却空气喷气机的升降和薄膜冷却效率的降低会发生，尤其是在高吹动速率下发生的，这是燃气轮机燃烧应用的典型代表。在新的冷却配置（例如沟槽冷却）中，横向分布了排出喷气机的冷却空气，该升降效果大大降低，可以大大降低，并且可以通过一个数量级的一个数量级来提高胶片冷却效率，以使某些工作条件的目标是对拟议的研究项目的详细效果和热传递冷却的良好理解，从而使效率冷却效果的组合得分更深数值研究。重点是研究复杂的不稳定流动，混合和传热过程中的沟槽冷却构型，这是尚不清楚的。使用生成的结果，可以开发出优化的薄膜冷却设备，这些冷却设备具有均匀的（对于各种操作条件），可在最小使用冷却空气时进行稳健的冷却膜。实验研究将使用光学非渗透测量技术（PIV- PIV- PIV，红外红外温度测量，温度敏感的颜色，温度敏感的颜色 - TSP），补充了热量和热量评估。通过使用高速PIV，可以详细检查复杂的不稳定流程结构。用于测量壁热流的红外和TSP测量技术的新型组合，可以确定传热系数的局部分布。使用商业CFD代码（使用可实现的K-Epsilon模型）进行实验的CFD模拟。对于大规模不稳定流量结构的详细数值研究，将使用开放源代码CFD代码OpenFOAM进行大型涡流模拟，该模拟已经在研究所建立了。