Experimental investigation on ignition performance of internally-staged combustor

At ambient temperature and pressure, ambient temperature and low pressure, the ignition performance of the internally-staged combustor was experimentally investigated. The inlet air pressure were 0.1, 0.035, and 0.03 MPa, respectively, and inlet air temperature was room temperature, ignition boundary was obtained at a series of air pressure drops(0.5%-6%). The experimental results indicate that, with the increase of pressure drop, the fuel-air-ratio (FAR) of lean ignition has a minimum value at different inlet air pressure. With the decrease of inlet air pressure, the pressure drop corresponding to the minimum FAR was decreasing, and FAR of lean ignition increases. A model of lean ignition was obtained by analyzing the effects of inlet air conditions, combustor reference velocity and SMD( Sauter mean diameter) of fuel on ignition performance.