Measurements of surface temperature distribution on a rotating disk with blade cooling holes using thermochromic liquid crystal

A wide-band thermochromic liquid crystal (TLC) was used in measuring the surface temperature of a rotating disk. The experiments were carried out in a test section with a rotor with 60 blade-cooling holes and heating at rim, a stator with central air inflow. The images of TLC were recorded with only the camera flashlight, and were translated into temperature distribution by hue technique. Results clearly shows that the influence of holes to the temperature field. Isotherms were distorted within distance of 100-150% of hole diameter from the hole's edge. The distortion develops with the rotating speed.