Combustion of gaseous hydrogen at low pressures in a 35 deg sector of a 28-inch-diameter ramjet combustor

I IGaseous bydrogen fuel w a s burned in a a cross section equal to 35O sector of a shrouded fuel-injector configurations were used to obtain ccmbustion data at the following high-altitude ramjet coldbustor conditions: pressure, 5 to 24 inches of mercury absolute; velocities, 340 to 160 feet per second; and inlet air temperature of 2 4 0 ' F. Ccmbustlon efficiencies were measured above 95 percent for wide bands of fuel-air ratios.The combustor configurations reported herein extend the efficient burning range of hydrogen at ramjet conditions to a pressure of 1/6 atmosphere; best configurations previously reported gave high efficiency to o n l y 1/2 atmosphere.Ccanparable combustion data af a f'ull-size ramjet engine using the shrouded fuel injector are also presented.