Fuel injection into high velocity jet shear layers in an enclosed 140mm diameter conical flame stabiliser, with four large jet shear layers and a central radial fuel injector, was studied at operating conditions relevant to high intensity burners and gas turbine primary zones. The mean exhaust emissions for propane were shown exhibit a high efficiency over a wide range of equivalence ratios with a good turn down ratio. Fuel and air mixing, propane combustion development and NOx formation was investigated using internal gas composition measurements at three simulated lean primary zone operating conditions. The combustion development and emissions was shown to be dominated by fuel and air mixing between a rich outer recirculation zone and a high velocity lean inner shear layer outflow region. An aerodynamically generated rich lean combustion system was generated without fuel or air staging, but the interface mixing region resulted in significant NOx generation.
Kelvin-Helmholtz instabilities of high-velocity magnetized shear layers with generalized polytrope laws