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

双壁喷射式涡轮机冷却：确定性不稳定和瞬变的影响。

• 批准号: 2779317
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2779317
• 关键词: Double; Wall; Effusion; Turbine; Cooling

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.

该项目将寻求确定尾迹通过产生的流动不稳定的影响，以及位于喷嘴导向叶片下游的转子叶片所经历的流场变化的影响。燃烧室还会产生严重的湍流和流动不稳定。这项工作将评估不稳定对将在双壁流出冷却涡轮叶片上实施的主动冷却系统的有效性的影响。这项研究将在大型风洞中同时使用计算流体力学和低速实验。这项研究将探索使用新的技术来产生不稳定，包括以前研究中使用的流体装置以及松鼠笼子或旋转杆装置。目的是为了更好地表示研究这一现象所需的带宽，并将降低上述装置所涉及的实验复杂性。这项研究将提供关于摄取对气膜冷却的影响的独特数据，以及双壁系统防止摄取所需的阈值。这项研究的影响将是能够设计出显著减少冷却剂供应的高压涡轮叶片。虽然冷却剂是必要的，但它是损失的来源，减少向燃气轮机发动机工作流体中喷射冷却剂会对机器的效率和功率产生巨大影响。因此，了解双壁面系统对发动机典型不稳定的可能响应对于评估双壁面性能是相关的。