Flow and combustion characteristics of an annular combustor

The Influence of Air/Fuel Ratio and Swirl Number on the Combustion Characteristics of a Model Combustor

“…Temperature distributions in the mid-vertical plane obtained with air/fuel ratios of 91 and 57 is shown in Figure 2. The primary zone is similar in the two cases because there is insufficient air to burn the fuel and this observation is consistent with those of (4) and (16). The temperatures in the hottest region of the intermediate zone are 100K higher with the higher air/fuel ratio due to the reduction in the higher-than-stoichiometric equivalence ratios, as shown in Figures 3(a) and 4(a).…”

Large eddy simulation of a model gas turbine combustor

“…The configuration selected in the present work is a model can-type combustor closely representative of that found in the Rolls-Royce Tay engine. The combustor, described in [23][24][25], comprises rows of primary and dilution ports, a circular to rectangular nozzle, as well as of porous walls, and the resulting flow pattern is extremely complex and is well suited to an investigation of the capabilities of LES. In the present work, the conserved scalar approach has been adopted to model the combustion process, both in view of the advantages offered by the method over more expensive, although more rigorous alternatives, and because of its success in previous works [16,17,26].…”

Jet Shear Layer Turbulent Diffusion Flames for Ultra-Low NOx Emissions

“…This results in a good flame stability and ignition characteristic, due to poor nixing with combustion occurring mainly in the recirculation zones between shear layers. This results in very large temperature gradients, as shown in the internal gas composition traverses of Heitor and Whitelaw (1986) and Bicen et al (1988), which generate large NOx concentrations and high smoke emissions. The authors have previously shown that if fuel injection is arranged such that the fuel is injected into the base of jet shear layers then simultaneous mixing and flame stabilization can be achieved within the jet shear layer (Al Dabagh and Andrews, 1983;Al Dabagh et al, 1985.…”