涡轮增压柴油机高原性能提升试验研究

为解决柴油机高海拔地区扭矩下降问题,在高原进排气模拟试验台架上,开展0~4500m不同海拔高度下某型柴油机的性能试验,对比分析了不同海拔下柴油机的动力性、经济性等指标。研究表明:随着海拔的增加,柴油机扭矩逐渐下降;在同一海拔下,随着转速的下降,扭矩也随之下降,并且在高海拔时该现象更为明显。研究发现,通过采用二级可调增压技术、提高过量空气系数、优化燃油系统结构及参数等手段,柴油机在高原环境下的动力性、经济性得到了明显改善,从而为后续提升柴油机高原性能开发工作提供了可行的技术方向。

Investigation on the Optimizing Range of CombustionChamber Configuration Parameters of DSCS

Aim To obtain an optimizing range of the main configuration parameters of double swirls combustion system (DSCS) Methods To analyze the influence of DS combustion cham-ber configuration parameters on fuel spray and mixing by means of the fuel jet developmentperiphery charts obtained by the high speed photography with a modeling test device deve-loped by authors,and to examine it by the tests on a single cylinder diesel engine.Resultsand Conclusion The mixing process can be divided into four phases.The optimizing range of the ration of the inner chamber diameter to the cylinder bore,d2/D,is 0.4-0.7; and the outerchamber diameter,d1 the height of the circular ridge to the piston top face,h1,the radius of outer/inner chamber circle,R1,R2 ,the max depth of outer/inner chamber bowl,H1,H2,etc. are also important

柴油机频繁自动熄火故障的分析与应急处理

对沃尔沃TAD1241GE型发动机燃油供给系统结构进行分析,通过一起发动机频繁自动熄火故障,介绍该类故障排查方法。