甲烷-空气燃烧中NO_x生成的简化模型研究

SIMPLIFIED MODEL OF NO X FORMATION IN A CH 4/AIR COMBUSTION SYSTEM

用特征值特征向量法对甲烷空气燃烧时ＮＯｘ生成的化学反应机理进行了简化，得到了仅由１５个基元反应组成的简化反应模型。对比计算结果表明，该模型能在较宽燃空比范围内与全面模型很好吻合，因而可望用于燃烧过程数值模拟时对ＮＯｘ生成的预测。该简化模型能较好模拟Ｂａｒｔｏｋ等的实验结果，尤其是贫燃情况，计算结果与实验值相当一致。

The mechanism of NO x formation in combustion process is extramely complex,simplifingthe NO x formation mechanism in aCH 4 /Air reaction system through sensitivitycalculationand eigenvalue eigenvector analysis Compared with convertional method,suchasquasi steady state approximation(QSSA),the eigenvalue eigenvector analysis can in dicateimportant reactions efficiently without providing any balance hypothesis In this pa per,areduced CH 4 /Air reaction model consists of15element reactions is obtained The de viationsin concentration for NO x and other major species between the simplified and afullmodelare minimal over awide fuel air ratio range,so the simplified model may be used topredictNO x product in numerical simulation of combustion processes Furthermore,the cal culatedNO x concetrations by the simplified model agree well with Bartok et al s experimentdata,especially in fuel lean region