High Pressure Combustor Studies of Flame Radiation as Related to Hydrocarbon Structure

摘要

Measurements were made of the total radiant energy from flames of 25 different fuels in a combustor operating at 22 different conditions. The test fuels consisted of a series of pure hydrocarbons, varying widely in molecular structure and boiling point, and a group of JP-5 fuels, blended to rigidly control hydrocarbon type and aromatic structure. This study was conducted using the Phillips 2-inch diameter research combustor, which simulates conditions for combustion in an aviation turbine engine. In general, flame radiation increased with increasing combustor pressure, inlet air temperature and heat input rate, and decreased with increasing flow velocity. However, the magnitude of these effects differed with both hydrocarbon structure and operating conditions. A satisfactory relationship was established between flame radiation and fuel hydrogen content, for a given operating condition. However, the relationship between fuel hydrogen content and flame radiation varied with operating conditions; therefore, an overall relationship was not developed. The relationship between fuel hydrogen content and fuel Luminometer Number is poor.