Combustion process investigation in a high speed diesel engine fuelled with n-butanol diesel blend by conventional methods and optical diagnostics
Combustion process investigation in a high speed diesel engine fuelled with n-butanol diesel blend by conventional methods and optical diagnostics
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DOI：
10.1016/j.renene.2013.11.017
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发表时间：
2014-04-01
期刊：
影响因子：
8.7
通讯作者：
Valentino, G.
中科院分区：
文献类型：
--
作者：
Merola, S. S.;Tornatore, C.;Valentino, G.
使用替代燃料，如生物柴油和乙醇，用于轻型CI发动机，以接近超低NOx和PM排放而没有燃料经济性损失的目标已经被广泛研究。近年来，丁醇作为一种可行的替代燃料，无论是单独使用还是与常规燃料混合使用，都可以减少对化石燃料的需求，同时减少颗粒物的排放，而不会显着增加NOx。本文通过常规方法和光学诊断研究了丁醇对燃烧过程的影响。首先，80%的柴油和20%的正丁醇（BU20）的共混物用于四缸，涡轮增压，水冷，直喷柴油发动机，配备了共轨喷射系统。进行正时和喷射压力的管理，以实现在自动点火之前输送几乎全部燃料量的条件。BU20允许在比柴油燃料（120 MPa）低的喷射压力（100 MPa）下获得几乎无烟的排放。在采用相同共轨多喷嘴喷射系统的单缸压燃式发动机燃烧室中，研究了掺混燃料对燃烧过程的影响。采用紫外可见数字成像和自然发射光谱技术研究了喷雾燃烧和污染物的形成。采用紫外可见发射光谱法对燃烧过程的化学标志物进行了检测。化学发光信号，由于OH，HCO和CO2发射带被检测到。OH排放与在排气处测量的NOx相关。可见光区碳烟的光谱特征与发动机排气碳烟排放有关。(C)2013爱思唯尔有限公司保留所有权利。
The use of alternative fuels, as biodiesel and ethanol, for light duty CI engines to approach the target of ultra low NOx and PM emissions without fuel economy penalty has been widely investigated. Recently, it is growing the interest in the butanol as a viable alternative either single or blended with conventional based fuels both to cut the demand for fossil fuel and to reduce emissions of particulate matter without significantly increasing in NOx.In this paper, butanol effects on combustion process were investigated through conventional methods and optical diagnostics. First, blends of 80% diesel and 20% n-butanol (BU20) were used in a four cylinder, turbocharged, water cooled, DI diesel engine, equipped with a common rail injection system. Management of timing and injection pressure was carried out to achieve conditions in which the almost total amount of fuel was delivered before auto-ignition. BU20 allowed to attain almost smokeless emissions at lower injection pressure (100 MPa) than diesel fuel (120 MPa). Smokeless conditions were achieved with a slight increase in NOx emissions (around 20%) and a minor penalty for the specific fuel consumption.Afterward, the blends effects on the combustion process were studied in the combustion chamber of a single cylinder compression ignition engine equipped with the same common rail multi-jets injection system. Spray combustion and pollutant formation were investigated by UV visible digital imaging and natural emission spectroscopy. UV visible emission spectroscopy was used for the detection of the chemical markers of combustion process. Chemiluminescence signals, due to OH, HCO and CO2 emission bands were detected. OH emission was correlated to NOx measured at the exhaust. The soot spectral feature in the visible wavelength range was related to the engine out soot emissions. (C) 2013 Elsevier Ltd. All rights reserved.