甲基叔丁基醚对正庚烷均质压缩燃烧抑制效果的试验研究  

The Inhibition Effect of Adding MTBE Compounds to N-heptane on Homogenous Charge Compression Ignition(HCCI) Combustion

作　　者：吕兴才[1] 吉丽斌[1] 侯玉春[1] 俎琳琳[1] 黄震[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《内燃机学报》2007年第4期364-371,共8页Transactions of Csice

基　　金：上海市自然科学基金资助项目(06ZR14045)

摘　　要：研究了含甲基叔丁基醚（MTBE）的正庚烷HCCI燃烧特性和排放影响因素.在单缸HCCI发动机上,开展了正庚烷、10%～50%MTBE正庚烷燃料在1800 r/min下不同负荷时的试验研究.研究表明,在正庚烷中加入MTBE后,低温反应时刻明显推迟,低温峰值放热率降低,负温度系数区持续时间延长,引起高温反应时间的推迟,从而使得最大平均指示压力（IMEP）增加,但是最小稳定运行IMEP也增加,燃烧效率相对降低.对影响HC和CO排放的参数分析发现,影响HC排放的主要参数是最高燃烧温度和燃料成分;而影响CO的参数主要有最高燃烧温度、最大压力升高率和平均指示压力.要保持较低的CO排放,最高燃烧温度要大于1 500 K,最大压力升高率高于0.5 MPa/°CA,平均指示压力大于0.3 MPa,燃烧持续时间小于9°CA.In this paper, an experimental study on combustion and emission characteristics of homogenous charge compression ignition （HCCI） combustion engines using n-heptane combined with methyl tertiarybutyl ether （MTBE） was conducted. The experiments were conducted on a single-cylinder HCCI engine using neat n-heptane, and 10% ,20% ,30% ,40% ,and 50% （by volume） MTBE/n-heptane blend fuels at 1 800 r/min. Experimental results show that, the ignition timing of low temperature reaction （LTR） was retarded, the peak values of heat release during the LTR was decreased, and negative temperature coefficient region duration was increased with the increase of MTBE in the blends. These lead to the retarding of the ignition timing of the high temperature reaction （ HTR）, an increase in maximum IMEP and the lowest IMEP and a decreasing in combustion efficiency. The results show that, the maximum combustion temperature, the rate of pressure rising, IMEP, the ignition timing of the HTR, the combustion duration, and fuel component are the main influencing parameters on HC emission. While the maximum combustion temperature, the rate of pressure rising, IMEP, and the combustion duration showed main influence on CO. Furthermore, in order to suppress CO emission at a low level, the maximum combustion temperature should be higher than 1 500 K with the maximum pressure rising rate larger than 0.5 MPa/° CA, the IMEP larger than 0.3 MPa, and the combustion duration shorter than 9° CA.

关 键 词：均质充量压缩着火(HCCI) 甲基叔丁基醚(MTBE) 正庚烷 燃烧特性 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]