Double Wall Effusion Turbine Cooling: The impact of deterministic unsteadiness and transients.

该项目将试图确定由尾迹传递和位于喷嘴导叶下游的转子叶片所经历的流场变化所产生的流动不稳定的影响。燃烧室也会产生明显的湍流和流动不稳定。该工作将评估非定常对双壁射流冷却涡轮叶片主动冷却系统有效性的影响。该研究将使用计算流体动力学和大型风洞的低速实验。本研究将探索使用新的技术来产生非定常，包括流体装置，以及鼠笼或旋转杆装置，以前的研究已经使用。目的是为了更好地表示研究这一现象所需的带宽，并将减少上述设备中涉及的实验复杂性。这项研究将提供独特的数据，摄入对膜冷却的影响，以及必要的阈值在双壁系统，以防止摄入。本研究的影响将是使高压涡轮叶片的设计显著减少冷却剂的供应。冷却剂虽然是必要的，但也是损失的来源，减少冷却剂在燃气涡轮发动机工作液中的注入会对机器的效率和功率产生巨大影响。因此，了解双壁系统对发动机代表性失稳的可能响应与评估双壁性能有关。

This project will seek to determine the impact of flow unsteadiness that emanates from wake passing and changes in the flow field experienced by the rotor blades positioned downstream of the nozzle guide vanes. The combustor can also develop significant turbulence and flow unsteadiness. The work will evaluate the impact of unsteadiness on the effectiveness of the active cooling system to be implemented in the double wall effusion cooled turbine blade. The research will use both computational fluid dynamics and low speed experiments in a large-scale wind tunnel. This research will explore the use of novel techniques for generating unsteadiness including fluidic devices as well squirrel cage or rotating bar apparatus that previous studies have employed. The aim is to better represent the necessary bandwidth to study this phenomenon and will reduce the experimental complexity involved in the aforementioned apparatus. This research will provide unique data on the effects of ingestion on film cooling, as well as the threshold necessary in the double wall system to prevent ingestion. The impact of this research will be to enable to design of a high-pressure turbine blade with significant reduction in coolant supply. Coolant, whilst necessary, is a source of loss and the reduction of its injection into the working fluid of a gas turbine engine can have dramatic effects on the efficiency and power of the machine. An understanding of the likely response of the double wall system to engine representative unsteadiness is therefore pertinent to the assessment of double wall performance.