Jet Engine Burn-Through Flame Characteristics.

Tests were run to determine the effect of the angle and radius of curvature of a firewall, with respect to a burn-through flame, on burn-through time. No difference was noted in burn-through time for angles of zero-, 10-, or 20-degrees. A slight increase was noted at 30 degrees, and at 40 degrees no burn-through occurred. No great difference in burn-through time was noted with a change in the curvature of the firewall. Centerline flatplate impingement pressures and temperatures were measured and graphed for burn-throughs having pressure ratios of 111, 91, 61, and 41, and hole sizes of 1, 1.5, and 2 inches. The exit velocity, density, and mass-flow rate were also calculated for those flames. The radial flatplate impingement profile was mapped for an 111 pressure ratio flame from a 1.5-inch hole. Flame characteristics of 161, 201, and 251 pressure ratio burn-throughs were estimated. Modified author abstract