極超小型燃焼器の課題と開発(<特集>超小型ガスタービンの開発)

概要

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Several technological issues are discussed with the aim of developing an ultra-micro combustor for ultra-micro gas turbines (UMGT). Under micro-scale combustion influenced by Quenching distance, high surface-to-volume ratio, shortened diffusion characteristic time and flow laminarization, we clarified the most important issues for the combustor of UMGT, such as high space heating rate, low pressure loss, low heat loss, and premixed combustion. This clarification led to a flat-flame burning method. For hydrogen, a prototype of a flat-flame ultramicro combustor with a volume of 0.067cm^3, a height of 1mm and a pressure loss of below 5% was made and tested. The flame stability region of the flat-flame satisfied the optimum operation region of the UMGT with a 16W output. Although heat loss to the outside of the combustor was notable, the temperatures in the combustion chamber were sufficiently high and the combustion efficiency achieved was more than 99.2%. The maximum space heating rate was 7.7×10^3MW/ (m^3・MPa). The excellence of the flat-flame burning method in the ultra-micro combustor for the UMGT using hydrogen was confirmed.
一般社団法人日本エネルギー学会の論文
2005-03-20