泵气平均有效压力变化规律的试验研究  

Experimental Study on Variation Rule of Pumping Mean Effective Pressure

作　　者：王绍明[1] 邓康耀[1] 崔毅[1] 邢卫东[2] 

机构地区：[1]上海交通大学动力机械及工程教育部重点试验室,上海200030 [2]中国北方发动机研究所,大同037036

出　　处：《内燃机工程》2010年第6期71-75,共5页Chinese Internal Combustion Engine Engineering

基　　金：柴油机高增压技术国防科技重点实验室基金项目(9140C3307080802)

摘　　要：为减小某增压6缸柴油机在改进设计时的泵气损失,对此柴油机在不同负荷特性下泵气平均有效压力的变化规律进行了试验研究。利用缸内压力和进排气压力波研究了泵气平均有效压力的变化规律。试验结果表明:在不同的负荷特性下,泵气平均有效压力分布情况有三种:全部为正值;随负荷增加由负值过渡至正值;全部为负值。在不同转速下,相同扭矩测试点的泵气平均有效压力进行横向对比时,变化规律是相同的,从低速到高速,泵气平均有效压力都是由正值逐渐变为负值。In order to reduce pumping loss of a turbocharged six-cylinder diesel engine under improvement design,the variations of its pumping mean effective pressure（PMEP） in various load characteristics were studied.Its cylinder pressure wave,intake and exhaust pressure waves were measured to analyze their variations.The results indicate that variation trends of the PMEP are different for each load characteristics.Some keep constantly positive or negative value and some change gradually from positive to negative.But when comparing PMEPs under the conditions of same torque and different speed,its variation trends are the same,with engine speed increasing from low to high,the PMEPs change always from positive to negative.

关 键 词：内燃机 柴油机 泵气平均有效压力 涡轮增压 排气压力波 

分 类 号：TK421.3[动力工程及工程热物理—动力机械及工程]