非定常噴流拡散火炎先端部における高濃度NO_x生成特性と低減手法(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
In diesel combustion it is commonly known that NO_x emission increases when the fuel injection pressure is increased. In steady state jet flame, however, NO_x emission index (NO_x mass for unit mass of fuel) decreases with increased injection speed due to shorter residence time for reaction. Based on a simple simulation on the jet axis, the authors reported that a large part of the NO_x is formed at the tip of the jet flame shortly after injection and that the increased NO_x by higher fuel injection speed in engines is due to the development of this region, where the residence time is longer than the other part of the jet. The purpose of this paper is to confirm this prediction experimentally and numerically. Experiments were made to measure NO_x from a jet flame injected in a closed vessel with different injection speeds and periods. The results of the experiment and simulation both showed agreement with the predictions above. Discussion is made on the concept of reducing NO_x from diesel engines.
一般社団法人日本機械学会の論文
2003-01-25