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Different flame holder materials and geometric parameters (pore size, thickness etc.) were experimentally tested in terms of pressure loss and combustion characteristics for the micro combustor of the ultra micro gas turbine (UMGT). Alumina ceramic porous plates, sintered stainless steel and perforated plates were used as flame holders within a 46 mm quartz walled micro combustor. The range of the average pore size of the porous plates and the sintered stainless steel plates are between 100 μm to 580 μm with an average porosity of 43∼54% and thickness of 1 mm to 4 mm. The perforated plate had a hole diameter of 1 mm and the distance between the centres of the holes was 2 mm. It was observed that the pore size and the thickness affect the pressure loss. However, at low incoming flow velocities all the flame holders had pressure losses of less than 5%. Flat flame combustion was achieved with all the different flame holders, but it stabilized at different incoming velocities and air to fuel ratios, according to different flame holder material and geometric parameters.

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