The development of a novel, hybrid catalytic combustor compatible with current and future gas turbine requirements is the goal of the EU project CATHLEAN. One main prerequisite for the operability of this catalytic combustor is the provision of a homogenous mixture of fuel and air at the entrance of the catalyst. A novel mixer unit consisting of a fuel injection, a large scale turbulence generator and a fine scale mixer should fulfil this requirement. Furthermore, a specific flow-correcting geometry promotes a near-uniform velocity distribution at the catalyst inlet. The present paper describes the computational development process of the fuel injection and the large scale turbulence generator. Detailed 3-D CFD studies using RANS models were carried out. The following optimisation steps have been performed: • fuel injection optimisation; • basic large scale turbulence generator development and optimisation; • detailed analysis of the final mixing section design (combination of fuel injection and large scale turbulence generator in a common mixing section). The results will be presented in light of the main design parameters: optimum mixing quality, minimized pressure loss and avoiding ignition of the fuel within the mixing device.

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