Studies of Gas Turbine Heat Transfer Airfoil Surfaces and End-Wall Cooling Effects.

摘要

Understanding and prediction of the heat transfer in a turbine is dependent first on understanding the complex three dimensional flow that occurs around a blade. In a turbine passage there are complex (interacting) vortices, significant variation in surface curvature, flow separation, transition from laminar to turbulent flow and perhaps relaminarization, and the influence of high turbulence level in the free stream flow. Heat or mass transfer measurements, aside from providing the needed design information, can also tell us a great deal about the flow. The transport of heat or mass has been used to detect characteristics of flow which were not readily detectable by other means. Modeling for computation of hte flow and heat transfer, also, require knowledge of the flow as well as transport data to check the validity of models and their accuracy. (JES)