壁面温度对微型内燃机燃烧特性的影响  

Effect of wall temperature on combustion characteristics of micro ICE

作　　者：唐志刚[1] 张力[1] 陈曦[1] 王庆朋[1] 

机构地区：[1]重庆大学汽车工程学院,重庆400044

出　　处：《浙江大学学报（工学版）》2016年第11期2107-2112,2176,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51175530);高等学校博士学科点专项科研基金博导类资助项目(20130191110001)

摘　　要：为了研究微型内燃机燃烧特性,搭建燃烧测试平台,分别对壁面温度40、90、120、130、145℃条件下的燃烧特性进行测试.试验结果表明:随壁面温度的逐渐提高,燃烧始点延迟,平均指示压力和燃烧压力呈线性降低趋势;但燃烧放热率加快,燃烧持续期缩短,循环变动率降低,燃烧稳定性增强.当壁面温度增至130℃时,微型内燃机表现出最好的燃烧稳定性.继续提高壁面温度至145℃时,燃烧持续期反而增加,燃烧稳定性显著恶化.微型内燃机较大的面容比是壁面温度能够较大程度影响进气与燃烧的主要原因.利用壁面温度对微空间燃烧过程的影响,提出不同热特性材料组合式微型内燃机的构造.A test platform was constructed to analyze combustion characteristics of micro internal combustion engines （ICE）. An experimental investigation on micro combustion characteristics of a micro ICE under wall temperatures of 40, 90, 120, 130 and 145 °C was conducted. Results showed that as the wall temperature of the micro ICE increased, the start of combusion （SOC） was delayed. Indicated mean effective pressure as well as the combustion pressure was decreased unfavorably. The rate of heat-release （ROHR） was increased advantageously, the combustion duration was shortened, cyclic variation rate was lowered, and the combustion stability was obviously improved. The most stable combustion for the micro ICE can be achieved at the wall temperature of 130 ° C . When further increasing the wall temperature to 145 °C , the combustion duration was prolonged, and the combustion stability was seriously deteriorated. The rather large rate of area to volume ratio makes the wall temperature generate the important effect on the intake and combustion processes of the micro ICE. Intentionally utilizing the thermal effect of wall temperature, a construction of the micro ICE which is fabricated by using several materials with different thermal conductivity was proposed.

关 键 词：微型内燃机 壁面温度 微燃烧 面容比 组合式内燃机 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]