Engineering Research Equipment Grant: Instrumentation for Unsteady Convective Heat Transfer Research in Rotating Machinery

高温涡轮机械流道内的非定常流动严重影响着流体与流道壁面之间的换热。在现代旋转机械中，不稳定性主要是由交替排列的静止和旋转环形叶片的相对运动引起的。研究换热过程所需的仪器包括短持续燃烧系统、快速响应热流传感器附件、高速数据采集系统和微型计算机。研究湍流模型、三维边界层、尾迹和射流、高速流动和无粘空气动力学是设备包可以应用的其他主题。最近的实验表明，流动不稳定会影响涡轮叶片的气动和传热性能。有必要为这种流动建立理论模型。通过确定非定常影响叶片传热的机制，合理设计实验可以在分析工具的开发中发挥至关重要的作用。

The unsteady flow which occurs in the passages of high temperature turbomachinery strongly influences the heat transfer between the fluid and the walls of the passages. In modern rotating machinery, the unsteadiness arises largely through the relative motion of the alternating rows of stationary and rotating annular blades. The instrumentation requested to study the heat transfer process includes a short duration combustion system, fast response heat flux sensor accessories, and a high speed data acquisition system and microcomputer. Research into turbulence modelling, three-dimensional boundary layers, wakes and jets, high speed flows, and inviscid aerodynamics are other topics to which the equipment package could be applied. Recent experiments have demonstrated that flow unsteadiness can affect the aerodynamic and heat transfer performance of turbine blades. There is a need to develop theoretical models for this flow. By identifying the mechanisms through which the unsteadiness affects the blade heat transfer, properly designed experiments can play a vital role in the development of analytical tools.