Studies of full-coverage film cooling: Part 1 - Cooling effectiveness of thermally conductive wall

Abstract

The combined heat transfer/heat conduction tests were performed by adopting brass and acrylic resin as a material for the full-coverage film-cooled wall. The 30 deg-slant injection holes are distributed in the staggered array with the two kinds of hole pitches, which are five and ten hole diameters in the streamwise and lateral directions. The free stream velocity was varied as 10 and 20 m/s, respectively, and the measurement of wall surface temperature was made with the help of liquid crystal as a temperature indicator. From these experiments, basic data are given for the head loss coefficient across the FCFC plate as well as the local and averaged cooling effectiveness for each material tested. Finally the heat transfer characteristics of FCFC are discussed from the heat balance of unit hole element and a technique for higher cooling effectiveness is demonstrated.