进气喷射不同辛烷值燃料的HCCI燃烧爆震试验分析  

An Experimental Analysis of Knock in Single-Cylinder HCCI Engine Fuelled Premixed PRFs

作　　者：侯玉春[1] 吕兴才[1] 俎琳琳[1] 方俊华[1] 黄震[1] 

机构地区：[1]上海交通大学内燃机研究所,上海200030

出　　处：《内燃机学报》2006年第5期414-420,共7页Transactions of Csice

基　　金：国家自然科学基金重点项目(50136040);国家重点基础研究发展规划项目(2001CB209208)

摘　　要：HCCI燃烧是化学动力学控制的均匀稀混合气的压缩自燃,大量的浓混合气同时着火燃烧导致燃烧速度过快而爆震。致力于能够描述或量化HCCI爆震程度方法的研究,进而建立HCCI爆震强度评价标准。不同辛烷值掺比燃料在不同工况的HCCI。燃烧压力信号的频谱对比分析结果表明:不同辛烷值燃料的HCCI燃烧爆震具有相近的爆震特征频带,其能量集中的主要爆震特征频带位于4-12 kHz;确定HCCI燃烧缸压信号在4-12 kHz频带处带通滤波的峰值压力Pbps为HCCI爆震强度评价标准,当Pbps大于0．15 MPa,断定HCCI燃烧出现爆震。据此找出不同辛烷值的混合掺比燃料HCCI燃烧的安全运行范围。HCCI combustion is auto-ignition of dilute and homogenous fuel-air mixture, which is controlled by the chemical kinetics. When rich fuel-air mixture is compressed and ignited simultaneously, the combustion rate is much rapidly and knock is occurred. This work is to develop the method for quantifying knock intensity and evaluating criterion for determining the knock. The spectral of the cylinder pressure on the PRFs （primary reference fuels） with different octane numbe, r at the distinctive operating points is investigated. The result shows that, different PRFs give similar major frequency band for HCCI knock combustion and the major frequency bank of knock of HCCI is between 4 kHz and 12 kHz. Pbps which is the amplitude of pressure by band pass filter between 4 kHz and 12 kHz is used to quantify knock intensity. When Pbps is over 0. 15 MPa, knock is presented in HCCI combustion. Hence, the safe operation region of the PRFs with the different octane number should be controlled under this value.

关 键 词：HCCI 掺比燃料 爆震 爆震特征频带 爆震强度评价标准 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]