Macroscopic and Microscopic Spray Characteristics of Diesel and Gasoline in a Constant Volume Chamber

The aim of this study is to investigate the spray characteristics of diesel and gasoline under various ambient conditions. Ambient conditions were simulated, ranging from atmospheric conditions to high pressure and temperature conditions such as those inside a combustion chamber of an internal combustion engine. Spray tip penetration and spray cross-sectional area were calculated in liquid and vapor spray development. In addition, initial spray development and end of injection near nozzle were visualized microscopically, to study spray atomization characteristics. Three injection pressures of 50 MPa, 100 MPa, and 150 MPa were tested. The ambient temperature was varied from 300 K to 950 K, and the ambient density was maintained between 1 kg/m3 and 20 kg/m3. Gasoline and diesel exhibited similar liquid penetration and spray cross-sectional area at every ambient density condition under non-evaporation. As the ambient temperature increased, liquid penetration length and spray area of both fuels’ spray were shortened and decreased by fuel evaporation near the spray boundary. However, the two fuels were characterized by different slopes in the decrement trend of spray area as the ambient temperature increased. The decrement slope trend coincided considerably with the distillation curve characteristics of the two fuels. Vapor spray boundary of gasoline and diesel was particularly similar, despite the different amount of fuel evaporation. It was assumed that the outer spray boundary of gasoline and diesel is always similar when using the same injector and injection conditions. In microscopic spray visualization, gasoline spray displayed a more unstable and asymmetric spray shape, with more dispersed and distributed fuel ligaments during initial spray development. Large amounts of fuel vapor cloud were observed near the nozzle at the end of the injection process with gasoline. Some amounts of this vapor cloud were attributed to the evaporation of residual fuel in the nozzle sac.

[1]  Bengt Johansson,et al.  Effects of Different Type of Gasoline Fuels on Heavy Duty Partially Premixed Combustion , 2009 .

[2]  Zhi Wang,et al.  Visualization of Partially Premixed Combustion of Gasoline-like Fuel Using High Speed Imaging in a Constant Volume Vessel , 2012 .

[3]  H. Andoh,et al.  Influence on Injection and Combustion Phenomena by Elimination of Hole Nozzle Sac Volume , 1986 .

[4]  Ming Chia Lai,et al.  Parametric Characterization of High-Pressure Diesel Fuel Injection Systems , 2003 .

[5]  Hans-Erik Ångström,et al.  Partially pre-mixed auto-ignition of gasoline to attain low smoke and low NOx at high load in a compression ignition engine and comparison with a diesel fuel , 2007 .

[6]  Choongsik Bae,et al.  The structure of a break-up zone in the transient diesel spray of a valve-covered orifice nozzle , 2006 .

[7]  Jun Yu,et al.  Effect of Nozzle Geometry on the Common-Rail Diesel Spray , 2002 .

[8]  John E. Dec,et al.  Advanced compression-ignition engines—understanding the in-cylinder processes , 2009 .

[9]  Dennis L. Siebers,et al.  Scaling Liquid-Phase Fuel Penetration in Diesel Sprays Based on Mixing-Limited Vaporization , 1999 .

[10]  D. Assanis,et al.  Homogeneous Charge Compression Ignition (HCCI) Engines , 2003 .

[11]  Andreas Cronhjort,et al.  Long‐working‐distance microscope used for diesel injection spray imaging , 1996 .

[12]  S. M. Shahed,et al.  The Effect of Mixing Rate, End of Injection, and Sac Volume on Hydrocarbon Emissions from a D.I. Diesel Engine , 1983 .

[13]  Bengt Johansson,et al.  Spray and Combustion Visualization of Gasoline and Diesel under Different Ambient Conditions in a Constant Volume Chamber , 2013 .

[14]  Raul Payri,et al.  Flow regime effects on non-cavitating injection nozzles over spray behavior , 2011 .

[15]  Tsukasa Hori,et al.  Visualization of Micro Structure in a Diesel Spray by Use of Photography with High Spatial Resolution , 2008 .

[16]  Cyril Crua,et al.  Optical Characterisation of Diesel, RME and Kerosene Sprays by Microscopic Imaging , 2011 .

[17]  Yuyin Zhang,et al.  Spray and mixture properties of evaporating fuel spray injected by hole-type direct injection diesel injector , 2008 .

[18]  Raul Payri,et al.  An experimental study of gasoline effects on injection rate, momentum flux and spray characteristics using a common rail diesel injection system , 2012 .

[19]  Bengt Johansson,et al.  An Advanced Internal Combustion Engine Concept for Low Emissions and High Efficiency from Idle to Max Load Using Gasoline Partially Premixed Combustion , 2010 .

[20]  Camille Hespel,et al.  Influence of the fuel properties on the spray development characteristics in a Diesel optical access engine , 2012 .

[21]  Kenji Kawai,et al.  Trial of New Concept Diesel Combustion System - Premixed Compression-Ignited Combustion - , 1999 .

[22]  Cyril Crua,et al.  High-Speed Microscopic Imaging of the Initial Stage of Diesel Spray Formation and Primary Breakup , 2010 .

[23]  Choongsik Bae,et al.  Spray and combustion characteristics of gasoline and diesel in a direct injection compression ignition engine , 2013 .

[24]  Raul Payri,et al.  Macroscopic Behavior of Diesel Sprays in the Near-Nozzle Field , 2008 .

[25]  Hans-Erik Ångström,et al.  Advantages of Fuels with High Resistance to Auto-ignition in Late-injection, Low-temperature, Compression Ignition Combustion , 2006 .

[26]  Gautam Kalghatgi,et al.  Auto-Ignition Quality of Practical Fuels and Implications for Fuel Requirements of Future SI and HCCI Engines , 2005 .

[27]  Christian Krüger,et al.  Analysis of Flow and Cavitation Phenomena in Diesel Injection Nozzles and Its Effects on Spray and Mixture Formation , 2003 .

[28]  Choongsik Bae,et al.  Effect of Injector Configuration on Combustion and Exhaust Emission in Direct Injection Compression Ignition Engine Fueled with Gasoline and Diesel at Idle and Low Load Operation , 2012 .

[29]  Nick Collings,et al.  Gasoline Fuelled Partially Premixed Compression Ignition in a Light Duty Multi Cylinder Engine: A Study of Low Load and Low Speed Operation , 2009 .

[30]  G. Greeves,et al.  Fuel Property Effects on Fuel/Air Mixing in an Experimental Diesel Engine , 1986 .

[31]  José V. Pastor,et al.  Fuel effect on the liquid-phase penetration of an evaporating spray under transient diesel-like conditions , 2011 .

[32]  Sylvain Savy,et al.  A Study of Methods to Lower HC and CO Emissions in Diesel HCCI , 2008 .