基于同步辐射显微CT技术的船用柴油机活塞顶积炭的密度测量
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摘要
积炭密度是柴油机燃烧室积炭的蓄热系数以及热扩散系数计算中的关键物理参数。基于同步辐射X射线相衬显微CT技术,对大型船用柴油机燃烧室内的积炭结构进行了三维无损重构。同时结合积炭的质量测量和定量的数字图像处理技术,得到了燃烧室内活塞顶积炭的密度,活塞顶积炭的平均密度在2 150 kg/m~3左右。活塞顶积炭的成分中金属化合物是主要贡献物,与气缸油的添加剂密切相关。
Density of carbon deposit(CD) is an important parameter for the calculation of thermal effusivity and thermal diffusivity. The X-ray micro-CT was used to investigate the structure of the CD in the combustion chamber of a large marine diesel engine. With the mass measurement of CD and quantitative digital image processing aiming for the volume measurement, the density of CDs was obtained. The density is around 2150 kg/m~3 for CD on the piston top. The main contribution of CDs is the metallic compounds from the additives in the cylinder oil.
Density of carbon deposit(CD) is an important parameter for the calculation of thermal effusivity and thermal diffusivity. The X-ray micro-CT was used to investigate the structure of the CD in the combustion chamber of a large marine diesel engine. With the mass measurement of CD and quantitative digital image processing aiming for the volume measurement, the density of CDs was obtained. The density is around 2150 kg/m~3 for CD on the piston top. The main contribution of CDs is the metallic compounds from the additives in the cylinder oil.
引文
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[2]STUDZINSKI W M,LIIVA P M,CHOATE P J,et al.A Computational and Experimental Study of Combustion Chamber Deposit Effects on NOx Emissions[M].SAE paper 932815,1993.
[3]HEYWOOD J B.Internal Combustion Engine Fundamentals[M].New York:Mc Graw-Hill Science/Engineering/Math,1988.
[4]BACHMAN H E,PRESTRIDGE E B.THE USE OF COMBUSTION DEPOSIT ANALYSIS FOR STUDYING LUBRICANT-INDUCED ORI[J].SAE Technical Paper750938,1975,
[5]KALGHATGI G T.Combustion Chamber Deposits in Spark-Ignition Engines:A Literature Review[M].SAE paper952443,1995.
[6]XUSHENG Z,GUANYUN P,GUOHAO D,et al.Investigation on the microstructure and pore characteristics of carbon deposit on the piston top land of marine diesel engine using synchrotron X-ray microtomography[J].SCIENTIA SINICA Technologica(in Chinese),2014,44(9):953-60.
[7]ZHANG X,PENG G,DU G,et al.Investigating the microstructures of piston carbon deposits in a large-scale marine diesel engine using synchrotron X-ray microtomography[J].Fuel,2015,142(15):173-9.
[8]HONG-LAN X,BIAO D,GUO-HAO D,et al.Latest advances of X-ray imaging and biomedical applications beamline at SSRF[J].Nuclear Science and Techniques,2015,26(2):Artical ID 020102,1-16.
[9]谢红兰,邓彪,杜国浩,等.上海光源先进成像技术及应用[J].现代物理知识,2010,22(3):42-50.
[10]陈荣昌,杜国浩,谢红兰,等.上海光源X射线成像实验站相位衬度CT初步结果[J].核技术,2009,32(4):241-5.
[11]XUSHENG Z,XIANGMING Z,XIUCHENG S,et al.Thermal and elemental analysis of the combustion chamber deposits in a large-scale two-stroke marine diesel engine[J].SCIENCE CHINA Technological Sciences 2015,58(10):1717-25.
[12]SIEGL W O,ZINBO M.On the chemical composition and origin of engine deposits[M]//EBERT L B.CHEMISTRY OF ENGINE COMBUSTION DEPOSITS.Springer US.1985.