高活性低辛烷值汽油压燃着火特性与表征燃料构建  

Compression ignition characteristics and surrogate formulation of a high reactivity low research octane number(RON) gasoline

作　　者：果泽先 王步宇[2] 王博远 张启航 蔡开源 王志[1] 帅石金[1,2] GUO Zexian;WANG Buyu;WANG Boyuan;ZHANG Qihang;CAI Kaiyuan;WANG Zhi;SHUAI Shijin(State Key Laboratory of Automotive Safety and Energy,School of Vehicle and Mobility,Tsinghua University,Beijing 100084,China;Institute for Aero Engine,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学,汽车安全与节能国家重点实验室,北京100084 [2]清华大学航空发动机研究院,北京100084

出　　处：《汽车安全与节能学报》2022年第4期778-784,共7页Journal of Automotive Safety and Energy

基　　金：国家自然科学基金面上项目(NSFC 51976101)。

摘　　要：为了解析汽油压燃(GCI)模式的燃烧排放特性,针对一种高活性低辛烷值汽油(HRG)开展了表征燃料设计研究。基于快速压缩机(RCM)平台,在有效温度690~920 K内,对该汽油燃料进行着火滞燃期试验;基于Chemkin软件对正庚烷/异辛烷(PRF)、正庚烷/异辛烷/甲苯(TRF)以及异己烷/正庚烷/异辛烷/甲苯(iso-HS)等3种表征燃料的滞燃期进行模拟。结果表明:与PRF及TRF相比,iso-HS呈现出更加显著的负温度系数(NTC)现象,且随着异己烷含量的提高,其负温度系数区域滞燃期变化幅度近似线性提高;组成为(按摩尔分数计)49.63%异己烷、18.30%异辛烷、26.29%正庚烷及5.78%甲苯的表征燃料iso-HS2具有更好的表征效果。A surrogate design was conducted for a high reactivity low octane number gasoline(HRG) to investigate the combustion and emission characteristics of gasoline compression ignition(GCI) mode. The ignition delay times of the HRG were measured using a rapid compression machine(RCM) in the effective temperature range of 690~920 K. Kinetic modelling study was conducted using Chemkin software with 3surrogate fuels: n-heptane/iso-octane(PRF), n-heptane/iso-octane/toluene(TRF), and iso-hexane surrogates(iso-HS) consisting of iso-hexane, n-heptane, iso-octane and toluene. The results show that compared with PRF and TRF, the iso-hexane surrogates show more obvious negative temperature coefficient(NTC) behavior;The variation amplitude of the ignition delay times within the NTC region increases approximately linearly with iso-hexane contents increasing;The surrogate iso-HS2 consisting of 49.63% iso-hexane, 18.30% iso-octane,26.29% n-heptane and 5.78% toluene(by mole fraction) can better capture the ignition characteristics of the HRG.

关 键 词：高活性低辛烷值汽油(HRG) 表征燃料 着火滞燃期 快速压缩机(RCM) 

分 类 号：TK428.9[动力工程及工程热物理—动力机械及工程]