Characterizing the dynamics of transition on turbofan blades

表征涡轮风扇叶片过渡动力学

• 批准号: 523776-2018
• 负责人: Rival, David
• 金额: $ 8.74万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693116
• 关键词: Characterizing; dynamics; transition; turbofan; blades

Pratt and Whitney Canada (P&WC) is a leading manufacturer of turbofan engines used in business jets. The high efficiency of these engines relies on the use of high-bypass ratio fan blades, for which the blades require the airfoil profile to be slender. Often during operation, the flow over these fan blades leads to the formation of a laminar separation bubble (LSB), and the boundary layer flow becomes transitional. At high altitudes and at low Reynolds numbers (Re), movement of the transition point may create unsteady loadings, which can potentially lead to severe vibration of the blade, known as flutter. The goal of this research program is to investigate how the formation of the LSB and its movement can contribute to flutter. The flow over a generic airfoil profile will be examined as a baseline case, using both state-of-the-art experimental and numerical tools. The eventual goal is to develop a properly calibrated transition model appropriate for use with industrial simulations that can predict the onset and behaviour of flutter over a range of operating conditions. The proposed program will primarily support training of highly-qualified personnel (HQP) including two undergraduate researchers (per year), four PhD students (per year) as well as two postdoctoral fellows (per year). The HQP will have an opportunity to either work closely with the P&WC or even conduct part of their research while at their R&D facilities in Mississauga.

普拉特（Pratt）和加拿大惠特尼（Whitney Canada）（P＆WC）是商务喷气机使用的Turbofan发动机的领先制造商。这些发动机的高效率取决于使用高型比率风扇叶片，为此，叶片需要修剪机翼的轮廓。通常在操作过程中，这些风扇叶片的流动会导致层状分离气泡（LSB）的形成，并且边界层流变为过渡。在高海拔和较低的雷诺数（RE）下，过渡点的运动可能会产生不稳定的载荷，这可能会导致刀片的严重振动，称为颤动。该研究计划的目的是研究LSB及其运动的形成如何有助于颤动。通用机翼轮廓上的流量将使用最新的实验和数值工具作为基准情况进行检查。最终的目标是开发适当的校准过渡模型，适合于工业模拟，该模拟可以预测一系列操作条件的颤动的发作和行为。拟议的计划将主要支持对高度合格人员（HQP）的培训，包括两名本科研究人员（每年），四名博士学位学生（每年）以及两个博士后研究员（每年）。 HQP将有机会与P＆WC紧密合作，甚至可以在密西沙加的研发设施中进行部分研究。