1930 不燃性気体先立ち噴射による非定常噴流火炎の NOx 低減効果

概要

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Similarities in the structure of spray flames suggest that higher fuel injection speeds would reduce NOx emission as the fuel residence time in the reaction zone would shorter. However, in diesel combustion it is commonly known that NOx emissions increase when the fuel injection velocity is increased. The authors have suggested from experimental and numerical analysis that the mixing time scale is significantly large at the spray tip region and existence of this unsteady structure is the major difference of the two flames. The purpose of this paper is to examine the effect of pre-injection of inert gas and air for the reduction of NOx : the aim was to eliminate the weak mixing zone at the tip and to create a fuel flow similar to a well developed jet structure. Experimental results showed NOx emissions decreased with his method, and the results provide clues to ways of reducing NOx in diesel spray flames.
一般社団法人日本機械学会の論文
2003-08-05