Titanium Coating Ignition Test.

Abstract : The objective of this program was to test the capability of state-of- the-art coatings to minimize self-sustained combustion and eliminate downstream propagation under environmental conditions typical of those present in current gas turbine engine compressors. Two kinds of coatings at different thicknesses were applied to two different titanium alloys and subjected to cascade (molten metal ignition) combustion testing. These tests resulted in 27 combinations using three pressures, three temperatures, and three air velocities. It was noted that burn severity and chordwise burn velocity were significantly affected by chamber air pressure and air velocity parameters. The presence of a coating decreased burn severity.