感温液晶による冷却翼内部流路伝達分布の計測法に関する研究

概要

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The objective of this study is to reveal heat transfer characteristics of a three-pass serpentine cooling channel inside a 10 : 1 scaled model of an actual turbine blade. A transient method using Thermochromic Liquid Crystal (TLC) is employed to measure the surface heat transfer distribution inside the model. Prior to the measurement, the soundness of the measurement technique adopted in this study is verified through heat transfer measurements of straight-duct models with and without turbulence promoting ribs. Great attention is paid to the streamwise decrease in the mainstream temperature due to the heat absorption into the test model, which otherwise results in indetermination of the reference temperature inside the model. To overcome this problem, the present study estimates the local air bulk temperature by linear interpolating or arithmetic averaging of the inlet and outlet flow temperatures. It follows from the heat transfer distribution of the serpentine model that streamwise variation in cross-section of the cooling passage substantially aifects the heat transfer characteristics in comparison with that of the straight duct model.
1998-06-10