Supersonic Mixing and Combustion of Coaxial Hydrogen-Air Streams in a Duct

摘要

A basic investigation of supersonic mixing and combustion which is relevant to advanced propulsion concepts for a high Mach number, high altitude flight regime is described. A method of laboratory simulation is employed which is considered to be suitable for fundamental studies of diffusional-controlled mixing and combustion of confined coaxial streams of hydrogen and air under conditions approaching those of actual flight. A unique test facility consisting of a gas-fired, ceramic-brick air storage heater and an electrical-resistance hydrogen heater was used to generate test flow conditions at low static pressures, over wide ranges of temperature and velocity. Research studies have been carried out to obtain basic flow field data pertinent to the problem of turbulent mixing and combustion of heterogeneous gas streams under these conditions. Auto-ignition data from tests involving sustained combustion at an air Mach number of 2.6 are also presented. (Author)