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Simultaneous measurement of evaporating fuel spray using laser induced exciplex fluorescence

Martine--Martínez S., Sánchez-Cruz F. A, Rodríguez-Morales G., Riesco-Ávila J. M., Gallegos-Munoz A.

Journal of KONES

2007

Vol. 14, No. 2

315-326

A macroscopic analysis of experimental measurements offuel sprays penetration on evaporating conditions using the Laser Induced Fluorescence Planar technique is presented. A pure fuel and tracers have been used to determine the two-phase process of the spray by characterizing the wavelengths they display when excited by a laser beam. An experimental set-up based on a single cylinder engine [1, 2], an Nd:YAG laser, an image acquisition system and a system of injection common rail have been used to carry out the experimental processes. Experimental results show the behaviour of the vapour phase and liquid phase in the spray under different thermodynamic conditions and injection parameters in the combustion chamber, particularly the work-fluid density and the injection pressure were observed. The measurement of these parameters is of interest to design the combustion chamber geometry and the piston bowl features of modern direct injection Diesel engines. In particularly, the sschematic diagram and main components of the equipment, cross-sectional view of the cylinder head, experimental layout of PLIEF imaging tests and images, examples of the liquid phase and vapour phase penetration, maximum penetration of the liquid and vapour phase as function of the work fluid density, Maximum penetration of the phase as function of the work fluid density, maximum penetration of the liquid and vapour phase as function of the injection pressure are presented in the paper.

Phenomenological study of the liquid phase penetration on diesel sprays

Martínez-Martínez S., Riesco-Ávila J. M., Gallegos-Munoz A.

Journal of KONES

2006

Vol. 13, No. 2

291-304

The phenomenological characterization of the liquid phase penetration on the diesel spray through the combustion chamber is very important to prevent and to reduce the pollution emission on the heavy duty Diesel engines as well as new combustion chambers design, for this reason, this work has concentrated on the characterization of the macroscopic behavior of the liquid phase penetration of diesel spray. The main purpose of this research is to define the influence of the nozzle hole diameter, injection pressure, gas density and temperature in diesel spray penetration on evaporating conditions. The results show that the nozzle hole diameter and thermodynamics properties as the gas density and temperature have a significant effect on the liquid phase penetration, while the injection pressure has no significant effect on the maximum liquid phase penetration. Schematic diagrams and main components of the equipment, experimental layout for imaging tests, instantaneous spray images, example of the liquid phase penetration for different nozzle holes, injection pressures, different gas density and temperature are presented in the paper.