B-7 UMGT用実機型水素燃料超小型燃焼器の試作と燃焼実験(燃焼II,一般講演)

概要

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The key issue to actualize practical ultra-micro combustors for Ultra Micro Gas Turbine (UMGT) is to reduce the heat losses from the combustor. Use of heat-insulation material reduces the heat losses to the surroundings. The heat loss ratio decreases substantially in reverse proportion to the space heating rate, leading the idea that it could be reduced by burning at high space heating rates. By settling the combustor insolated from the compressor and turbine, the heat transfer from the combustor to the compressor and turbine becomes negligible. Base on these considerations, an engineering-model of hydrogen-fueled flat-flame ultra-micro combustor with a combustion chamber volume of 69.4 mm3 was developed. To obtain high overall heat-insulation, heat-resistant and strength, the engineering-model combustor had a triple layer structure with an advanced ceramic, a heat insulation material and a stainless steel. To solve the heat transfer issue in the combustor, it was isolated from the other components. Furthermore it was designed by considering structure, size, material, velocity, pressure loss and prevention of flashback. The burning test of the combustor showed that it was easy to ignite and burn with a stable flame. The stable flame region was enough wide to satisfy the design operation point of the combustor.
2008-10-01