., 2011.Annular diffusers with large downstream blockage effects for gas turbine combustion applications. Journal of Propulsion and Power, 27(6), pp. 1218-1230. Additional Information:• This paper was published in the Journal of Propulsion and In engineering applications, diffuser performance is significantly affected by its boundary conditions. In a gas turbine combustion system, the space envelope is limited, the inlet conditions are generated by upstream turbomachinery, and the downstream geometry is complex and in close proximity. Published work discusses the impact of compressor-generated inlet conditions, but little work has been undertaken on designing diffusers to accommodate a complex downstream geometry. This paper considers the design of an annular diffuser in the presence of a large downstream blockage. This is most applicable in the combustion system of a low-emission landbased aero-derivative gas turbine, where immediately downstream of the diffuser approximately 85% of the flow moves outboard and 15% moves inboard to supply the various flame-tube and turbine-cooling features. Several diffuser concepts are numerically developed and demonstrate 1) the interaction between the diffuser and downstream geometry and 2) how this varies with changes in diffuser geometry. A preferred concept is experimentally evaluated on a low-speed facility that simulates the combustion system and provides compressorgenerated inlet conditions. A conventionally designed aero-derivative diffuser system is also evaluated and, with reference to this datum, the system total pressure losses are reduced by between 20 and 35%.= mass flow rate N = rotor speed P, p = local total or static pressure R, r = radius T, t = local total or static temperature To 1 = total temperature in rig inlet U = velocity U blade = rotor midpassage blade speed Va = midpassage axial velocity y = dimensionless wall distance = kinetic energy coefficient = diffuser cant angle R = change in radius = total pressure loss coefficient = density = area-weighted spatially averaged mean valuẽ = mass-weighted spatially averaged mean value