Performance of a turbojet combustor using natural gas fuel heated to 1200 F /922 K/

Combustion efficiency was determined using natural gas fuel over a range of injection temperatures f r o m ambient to 1200' F (922 K).The combustor was comprised of three U-gutter flameholders mounted downstream of a trumpet-shaped diffuser in a rectangulai housing.A simple film-cooled liner was used.Tests were conducted at ambient press u r e over a range of fuel-air ratios and combustor reference velocities.Increases in efficiency of m o r e than 40 percentage points w e r e achieved at the higher fuel temperat u r e s .The results a r e applicable to natural gas afterburner design and to the design of advanced low-pressure-loss primary combustors. Security Classif. (of this page) 21.No. of Pages 22.