Heat flux from a fuel-air detonation to a structure

This paper reports that the heat flux to positions both inside and on the outer wall of a structure was measured by means of thin-film thermocouple during the detonation of a hydrocarbon fuel-air cloud. This test series consisted of two events: atmospheric detonation of 1000 and 3000 kg of propylene oxide. The measurement locations included positions with an without lines of sight to the fireball. The short duration of the test (∼20 ms) requires a very fast response time from the heat flux gauges. The results of these tests showed a large heat flux (O 106) (W/m2) at positions with a direct line of sight to the cloud but a much lower flux at positions having no direct line of sight