Heat transfer coefficient measurements on a turbine nozzle using liquid crystals

摘要

In the design of the recent gas turbine cooling blade, it is important to get accurate heat transfer coefficient distribution over the whole airfoil surface. This paper presents a measurement technique of heat transfer coefficients onthree-dimensionally complex surfaces, in which thermochromic liquid crystals (TLC) are utilized to determine temperature values and TLC tristimulus values (RGB). This technique was applied to a gas turbine nozzle surface in a Tow-speed semi-annularcascade with Reynolds number of 1.6× 10{sup}6 and turbulence intensity of 2.1%. The results agreed well with those measured by thermocouples and proved its validity.