Consideration on Burning at High Space Heating Rates in Ultra-micro Combustors for UMGT

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  • UMGT用極超小型燃焼器内での高負荷燃焼に対する一考察
  • UMGTヨウ ゴクチョウ コガタ ネンショウキ ナイ デ ノ コウフカ ネンショウ ニ タイスル イチ コウサツ

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Abstract

<p>In order to clarify the functions of the space heating rate (SHR) for a combustor of ultra-micro gas turbines (UMGT), the relation between the SHR, the residence time in the combustor (τb) and the heat loss ratio (HRL) were derived. It is deduced that τb depends only on the SHR without any relation to the scale of the combustor, and is inversely proportional to the SHR. This relation was confirmed for many gas turbine combustors of various sizes with a volume of 0.06x10-6 - 0.146 m3 using H2, C3H8, and Jet fuel. Experimental results of flat-flame type ultra-micro combustors indicated that the maximum value of the SHR corresponds to the chemical limitations on combustion rate for each type of fuel in the combustor, and the minimum permissible value of the SHR was limited by heat losses to the surroundings. The HLR is also deduced to decrease in approximately inverse proportion to the SHR, which was confirmed by heat loss measurements of flat-flame type ultra-micro combustors. The importance of the SHR in ultra-micro combustors is discussed.</p>

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