不同大气压力和生物柴油/柴油掺混比对柴油机噪声的影响  

Effect on noise of diesel engine under different atmospheric preessure and biodiesel blends

作　　者：周明[1] 沈颖刚[2] 梁友才[2] 林玉珍 李耀平[2] 

机构地区：[1]云南机电职业技术学院,云南昆明650203 [2]昆明理工大学交通工程学院,云南昆明650224 [3]云南省技术监督局,云南昆明650041

出　　处：《内燃机车》2011年第9期5-10,49,共6页Diesel Locomotives

基　　金：云南省中青年学术技术带头人后备人才专项基金(2007py01-07)

摘　　要：使用大气模拟试验台进行了直喷式柴油机在高原环境不同大气压下燃用不同体积掺混比生物柴油/柴油混合燃料的噪声测量对比试验研究。结果表明:噪声声功率随着大气压力和生物柴油掺混比的增加而减小;怠速工况时,在101kPa和81kPa大气压下分别燃用掺混比为70%和80%的混合燃料噪声值最小;在630～2000Hz噪声主要贡献频带上,各个测试点燃用B100油时声压级较B0油小;在高原环境下使用生物柴油可有效地降低柴油机整机噪声。This paper studies the comparative noise level of 4100QB-2 diesel engine under different altitudes using atmosphere simulation test bench when fueled with the different biodiesel blends.The results have indicated that the noise acoustical power level decreases as the increase of atmospheric pressure and biodiesel concentration.Under idle condition,noise level can be minimized by using mixed fuel of 70% blend ratio under 101 kPa and mixed fuel of 80% blend ratio under 80 kPa.In the main contribution band of 630~2000 Hz,sound pressure level at each test point using B100 is lower than that using B0.It Is effective to control diesel engine noise in the plateau region by using biodiesel.

关 键 词：生物柴油 噪声 柴油机 大气压力 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]