摘要
进排气压力的瞬态特性对泵气损失、充气效率以及涡轮增压器废气能量利用有重要影响。为研究进排气压力波动的变化规律,以增压中冷4缸柴油机为对象,利用进排气以及缸内瞬态压力传感器和燃烧分析仪,对不同工况下进排气管处的瞬态压力进行了测试与分析。研究结果表明:当发动机转速一定时,随着负荷的增加,排气压力曲线随曲轴转角的变化规律基本一致,波峰峰值增加,但波峰峰值所对应的曲轴转角不变,在进气门开启前270~°附近的位置,排气压力的波动强度随负荷的增加而增加。在外特性下,随着转速的增加,排气压力波峰所对应的曲轴转角位置后移,同时波峰峰值明显升高,从2 200 r/min到4 000 r/min,4个波峰峰值平均增加15.7%。在相同转速不同负荷下,进气压力波动的规律相近,进气压力的平均值和波动均方根随着负荷的增加而增加,但是波动强度变化不大。
The transient characteristics of intake and exhaust pressure play an important role in pumping gas loss, gas charging efficiency and energy utilization of turbocharger exhaust gas. In order to study the changing regularity of intake and exhaust pressure fluctuation, the turbocharged intercooled 4-cylinder diesel engine as the research object, using the exhaust and transient cylinder pressure sensor and combustion analyzer, the transient pressure on the different conditions of the intake and exhaust pipe is tested and analyzed. The results show that, when the engine speed is constant, peak value goes up while its corresponding CA remains the same with the increase of engine load advanced intake valve opening about 270°. Exhaust pressure fluctuation intensity rises with the increase of load. With the increase of engine speed, CA corresponding to pressure peak moves back and peak values increase, and the peak value increases by 15.7% from 2 200 r/min to 4 000 r/min in the external characteristic. Under the same engine speed and different load, the law of inlet pressure fluctuation is similar, the average value of the intake pressure and the root mean square of the fluctuating pressure rise with the increase of the load, but the fluctuation intensity does not change much.
作者
尹升
毕玉华
张生斌
宋国富
代国雄
申立中
雷基林
Yin Sheng;Bi Yuhua;Zhang Shengbin;Song Guofu;Dai Guoxiong;Shen Lizhong;Lei Jilin(Department of Power Machinery and Engineering, Kunming University of Science and Technology, Kunming City, Yunnan Province 650500, China;Yunnan Yunnei Power Group Co., Ltd., Kunming City, Yunnan Province 650500, China)
出处
《农业装备与车辆工程》
2018年第5期1-6,共6页
Agricultural Equipment & Vehicle Engineering
基金
国家自然科学基金:VNT与EGR耦合对不同海拔燃用含氧燃料柴油机工作过程的影响(51466003)
国家自然科学基金:不同海拔下柴油机瞬变工况与可变喷嘴涡轮增压器响应特性的协调控制研究(51666005)
关键词
增压柴油机
排气压力波动
瞬态测量
变化规律
turbocharged diesel engine
exhaust pressure fluctuation
transient measurement
change law
