LPG浓度对DME/LPG混合燃料HCCI燃烧的影响  

Effect of LPG concentration on the combustion of DME/LPG blended fuel by using HCCI

作　　者：罗马吉[1] 黄震[2] 

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]上海交通大学内燃机研究所,上海200030

出　　处：《华中科技大学学报（自然科学版）》2006年第9期88-90,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家杰出青年科学基金资助项目(50025619);国家重点基础研究发展计划资助项目(2001CB209208)

摘　　要：通过分析二甲醚(DME)与液化石油气(LPG)的化学反应机理,构建了反映DME/LPG混合燃料均质压燃(HCCI)燃烧的化学反应机理.采用该机理应用单区燃烧模型对DME/LPG混合燃料HCCI燃烧的化学反应动力学过程进行了数值计算,模拟研究了混合燃料中LPG浓度对HCCI燃烧的影响.计算结果与试验结果对比表明,所构建的DME/LPG混合燃料氧化的化学反应机理能够准确预测DME/LPG混合燃料的两阶段放热特性,对低温和高温着火始点的预测很好.模拟结果显示,改变DME/LPG混合燃料中LPG的浓度可以控制HCCI着火和燃烧;在DME中添加LPG可以拓宽发动机的负荷运行范围.The chemical kinetic mechanisms of dimethyl ether （DME） and LPG was analyzed. A chemical kinetic mechanism was put forward to explain the combustion of DME/LPG blended fuel by using HCCI. On the basis of the proposed mechanism, the chemical kinetic process of the combustion of DME/LPG blended fuel with HCCI was simulated by single zone model. The effect of LPG concentration on HCCI combustion was numerically studied. Comparison between simulation and experiment indicates that the proposed detailed mechanism of DME/LPG oxidation can precisely predict the twostage heat release characteristics of DME/LPG HCCI combustion and the predicted ignition timings of low temperature reaction and high temperature reaction are agreed well with the experimental ones. The simulated results suggest that altering the LPG concentration in DME/LPG blended fuel can control HCCI ignition and combustion process and the load operating range of HCCI engines can be extended by adding LPG into DME.

关 键 词：柴油机 均质压燃燃烧 反应机理 二甲醚 液化石油气 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]