Ceramic Coating Effect on Liner Metal Temperatures of Film-Cooled Annular Combustor

摘要

An experimental and analytical investigation was conducted to determine the effect of a ceramic coating on the average metal temperatures of a full-annular, film-cooled combustion chamber liner. This investigation was conducted at pressures from 0.50 to 0.73 MPa, inlet air tempera¬tures of 589 and 894 K, and overall fuel-air ratios from 0.012 to 0. 062. At all test conditions, experimental results indicate that application of a ceramic coating will result in significantly lower wall temperatures. In a simplified heat-transfer analysis, good agreement between experi mental and calculated liner temperatures was achieved.' Simulated spalling of a small portion of the ceramic coating resulted in only small increases in liner temperature because of the thermal conduction of heat from the hotter, uncoated area to the adjacent, coated liner metal.