基于一维/三维模型耦合的富氧燃烧天然气发动机数值模拟  

Numerical Simulation of Oxygen-rich CNG Engine Based on 1D/3D Coupled Model

作　　者：姜伟[1] 张玉银[1] 李世琰 张勇[1] 张伟[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海空间电源研究所,上海200245

出　　处：《车用发动机》2015年第6期39-43,共5页Vehicle Engine

基　　金：上海航天技术研究院-上海交大航天先进技术联合研究中心资助项目(USCAST2013-32)

摘　　要：以某1.0L3缸汽油机为基础,利用GT-Power与Converge建立了天然气发动机耦合仿真模型,并利用原机试验数据对模型进行了验证,研究了进气富氧与EGR对天然气发动机性能的影响特性,对利用进气富氧与EGR改善天然气发动机的性能进行了探讨。结果表明,随进气氧气体积分数提高,天然气发动机平均有效压力显著提高,最大可提高22.8%(氧体积分数为28%时);同时缸内温度和NOx排放升高,排气与传热的能量损失增加,燃气消耗率略有升高。加入EGR可以降低富氧燃烧下天然气发动机燃气消耗率,随着EGR率增加,燃气消耗率主要呈先减小后增加趋势;且随进气氧浓度提高,各浓度下最低燃气消耗率对应的EGR率逐渐提高;NOx排放随EGR率增加而逐渐降低,在进气氧体积分数为23%,25%,27%,29%时,EGR率分别为10%,15%,20%,25%即可将NOx排放降到原机水平;利用进气富氧与EGR可以有效地改善天然气发动机动力不足与NOx排放高的状况。The coupled simulation model of CNG engine was built with GT-Power and Converge software based on a 1.0Lgasoline engine and was calibrated with test data of original engine.Then the influences of oxygen-rich intake and EGR on CNG engine performance were researched and the performance improvements thereof were discussed.The results show that BMEP for CNG engine increases obviously with the increase of oxygen volume fraction and increases by 22.8%at most in 28%oxygen content.Moreover,the in-cylinder temperature,NOxemission,the energy loss of exhaust and heat transfer all increase and BSFC slightly increases.The specific CNG consumption under the conditions of rich oxygen decreases by introducing EGR and shows the trend of first decrease and following increase with the increase of EGR rate.The corresponding EGR rate of the lowest CNG consumption increases gradually with the increase of oxygen content.NOxemission increases with the increase of EGR rate and can reach the emission level of original engine when the EGR rate is 10%,15%,20%and 25%respectively in oxygen volume fraction of 23%,25%,27%and 29%.Accordingly,the oxygen-rich intake and EGR can improve the power and NOxemission of CNG engine effectively.

关 键 词：天然气发动机 富氧燃烧 废气再循环 数值模拟 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]