摘要
以一台增压中冷压燃式发动机为试验样机,在其第1缸进行甲醇混合气自燃试验,分析甲醇自燃的压力振荡特性,研究超级爆震中破坏性压力波形成的规律。研究结果表明:随着过量空气系数的减小,甲醇自燃的概率有上升的趋势;而在同一过量空气系数下,上止点前着火的循环最高燃烧压力和压力振荡幅度远大于上止点后着火的循环,振荡频率也较高,并且随着着火时刻靠近上止点,最高燃烧压力和压力振荡的幅度与频率均增大;自燃时刻位于上止点前附近时,压力振荡的破坏性最大;甲醇自燃与超级爆震类似,具有间歇性。
A methanol mixture auto-ignition test is conducted on the first cylinder of a turbocharged intercooled diesel engine to analyze the pressure oscillation characteristics of methanol auto-ignition and study the forming law of destructive pressure wave in super knock. The results show that the probability of methanol auto-ignition tends to increase with the decrease of excessive air coefficient. At a same excessive air coefficient, when auto-ignition happens before TDC, both the peak pressure and the amplitude of pressure oscillation are far greater than those when it happens after TDC, with its oscillation frequency also higher. The closer to TDC the auto-ignition moment, the greater the peak pressure and the amplitude and frequency of pressure oscillation, with the greatest destruction of pressure oscillation occurs when auto-ignition happens at near but before TDC. Finally it is also found that methanol auto-ignition happens intermittently, similar to super knock.
出处
《汽车工程》
EI
CSCD
北大核心
2015年第4期396-401,共6页
Automotive Engineering
基金
国家自然科学基金(51176135)
教育部博士点基金(20120032130009)资助
关键词
甲醇
自燃
压力振荡
超级爆震
methanol
auto-ignition
pressure oscillation
super knock
