IMAGING OF VAPOR/LIQUID DISTRIBUTIONS OF SPLIT-INJECTED DIESEL SPRAYS IN A TWO-DIMENSIONAL MODEL COMBUSTION CHAMBER

The ultraviolet-visible laser absorption-scattering (LAS) technique was extended to simultaneous imaging of two-dimensional vapor/liquid mass distributions in a nonaxisymmetric evaporating diesel spray such as that injected into a two-dimensional model combustion chamber of direct-injection diesel engines. The main error for vapor measurement is incurred by the temperature dependence of molar absorption coefficients (TDMAC) of the test fuel. Thus, selecting a test fuel of negligible TDMAC can greatly increase the measurement accuracy. By means of this extended LAS technique, the overall mass, as well as the mass distribution of vapor and liquid phase per projection area perpendicular to the laser beam, was obtained, and then the behavior of split-injection diesel spray in a two-dimensional model combustion chamber in a high-temperature high-pressure constant-volume vessel was observed. Finally, the effects of injection mass ratios on the distributions of vapor and droplets and characteristics of fuel/air mixing were examined.

[1]  K. Nishida,et al.  Quantitative Measurement of Droplets and Vapor Concentration Distributions in Diesel Sprays by Processing UV and Visible Images , 2001 .

[2]  L. Melton,et al.  Direct Calibration Procedures for Exciplex-Based Vapor/ Liquid Visualization of Fuel Sprays , 1990 .

[3]  Rolf D. Reitz,et al.  Reducing Particulate and NOx Emissions by Using Multiple Injections in a Heavy Duty D.I. Diesel Engine , 1994 .

[4]  K. Nishida,et al.  PLANAR MEASUREMENTS OF THE LIQUID PHASE TEMPERATURE IN DIESEL SPRAYS INJECTED INTO HIGH-PRESSURE AND HIGH-TEMPERATURE ENVIRONMENTS , 1996 .

[5]  P. Miles.  Raman line imaging for spatially and temporally resolved mole fraction measurements in internal combustion engines. , 1999, Applied optics.

[6]  K. Nishida,et al.  Characterization of Droplets and Vapor Concentration Distributions in Split-Injection Diesel Sprays by Processing UV and Visible Images , 2003 .

[7]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[8]  H. Kosaka,et al.  Quantitative Measurement of 2-D Fuel Vapor Concentration in a Transient Spray via Laser-Induced Fluorescence Technique , 1994 .

[9]  Rolf D. Reitz,et al.  Reducing Particulate and NOx Using Multiple Injections and EGR in a D.I. Diesel , 1995 .

[10]  Yuyin Zhang,et al.  Characterization of Mixture Formation in Split-Injection Diesel Sprays via Laser Absorption-Scattering (LAS) Technique , 2001 .

[11]  張 玉銀.  A study on mixture formation in diesel sprays with split-injection strategy , 2001 .

[12]  Federico Millo,et al.  Influence of Multiple Injection Strategies on Emissions, Combustion Noise and BSFC of a DI Common Rail Diesel Engine , 2002 .

[13]  D. Foster,et al.  The Effect of Split Injection on Fuel Distribution in an Engine-Fed Combustion Chamber , 1993 .

[14]  K. Nishida,et al.  Imaging of droplets and vapor distributions in a diesel fuel spray by means of a laser absorption-scattering technique. , 2000, Applied optics.

[15]  Rolf D. Reitz,et al.  An Experimental and Numerical Study of Sprays from a Common Rail Injection System for Use in an HSDI Diesel Engine , 1998 .

[16]  Gian Marco Bianchi,et al.  Numerical Analysis of Passenger Car HSDI Diesel Engines with the 2nd Generation of Common Rail Injection Systems: The Effect of Multiple Injections on Emissions , 2001 .

[17]  Thomas A. Litzinger,et al.  Planar laser rayleigh scattering for quantitative vapor-fuel imaging in a diesel jet☆ , 1997 .

[18]  恵哉 西田,et al.  直噴ディーゼル噴霧のスプリット噴射時のモデル燃焼室内における挙動 : 第2報, 噴射量割合の影響 , 2000 .

[19]  C. M. Sliepcevich,et al.  Scattering of Light by Large Spherical Particles , 1953 .

[20]  Rolf D. Reitz,et al.  Experimental and Numerical Studies of High Pressure Multiple Injection Sprays , 1996 .

[21]  Rolf D. Reitz,et al.  Measurement of the Effect of Injection Rate and Split Injections on Diesel Engine Soot and NOx Emissions , 1994 .

[22]  R. Reitz,et al.  Modeling the Effects of Fuel Injection Characteristics on Diesel Engine Soot and NOx Emissions , 1994 .

[23]  N Ladommatos,et al.  Optical diagnostics for in-cylinder mixture formation measurements in IC engines , 1998 .

[24]  T. Kamimoto,et al.  A New Technique for the Measurement of Sauter Mean Diameter of Droplets in Unsteady Dense Sprays , 1989 .

[25]  Dean C. Hammond,et al.  Deconvolution technique for line-of-sight optical scattering measurements in axisymmetric sprays. , 1981, Applied optics.

[26]  Rolf D. Reitz,et al.  Mechanism of Soot and NOx Emission Reduction Using Multiple-injection in a Diesel Engine , 1996 .

[27]  Patrick V. Farrell,et al.  High Pressure Multiple Injection Spray Characteristics , 1996 .