重型车用柴油机燃烧与排放特性分析

发布时间：2018-04-27 01:19

本文选题：重型柴油机 + 台架试验　；参考：《科学技术与工程》2016年11期

【摘要】：针对某重型车用柴油机的燃烧特性与污染物排放特点,通过台架试验方法测试了不同转速和不同负荷下重型车用柴油机的燃烧特性、主要污染物PM与NO_x排放。结果表明:对该重型车用柴油机,在外特性高转速工况下,滞燃期增长,缸内燃烧过程中扩散燃烧所占比重增加;在柴油机常用转速1 400 r/min情况下,随着柴油机负荷增加,滞燃期逐渐缩短,燃烧持续期呈先缩短后增加的趋势,扩散燃烧所占比重增加。在外特性低转速工况,柴油机缸内的滞燃期较长,燃烧温度高,碳烟和NO_x排放均较高;在高负荷工况,由于供油量加大,燃烧持续期变长、燃烧温度高,碳烟和NO_x排放也比较高。
[Abstract]:According to the combustion characteristics and pollutant emission characteristics of a heavy duty vehicle diesel engine, the combustion characteristics of heavy duty vehicle diesel engine under different rotational speeds and different loads were tested by bench test method. The main pollutants PM and NO_x emissions were measured. The results show that for the heavy duty vehicle diesel engine, the delayed combustion period increases and the proportion of diffusion combustion increases in the combustion process of the heavy duty diesel engine under the condition of high external characteristic and high speed, and under the condition of 1 400 r/min of diesel engine's commonly used speed, with the increase of diesel engine load, The delayed combustion period was gradually shortened, the combustion duration was shortened first and then increased, and the proportion of diffusion combustion increased. Under the condition of low external speed, the combustion delay period is longer, the combustion temperature is high, the soot and NO_x emissions are higher in the diesel engine cylinder, and the combustion duration is longer and the combustion temperature is higher under the high load condition due to the increase of fuel supply. Soot and NO_x emissions are also relatively high.
【作者单位】：装甲兵工程学院;总装备部车船军代局驻西安军代室;
【基金】：军队科研基金项目(2014WX08)资助
【分类号】：U464.172

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