(2-01) Effect of Compression Pressure on the Spray Morphology of GDI Pressure-Swirl Injectors((SI-1)S. I. Engine Combustion 1-Direct Injection Engines)

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概要

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• This paper describes the effects of compression pressure on the spray morphology produced by a GDI injector, in terms of the cone angle and the penetration of the developing spray. Data have been collected in the form of back lit CCD images and are supported by Phase Doppler Anemometry (PDA) measurements of time averaged droplet velocity and size. The measurements were made in a high pressure bomb and two single cylinder Diesel engines with cylinder heads designed to provide good optical access to the spray. The effects of a varying compression pressure were studied by injecting into the combustion chambers at different times during the compression stroke. It was found that the cone edge could be defined from a single shot image due to the inherent stability and repeatability of this part of the spray. A family of curves have been determined, an example is shown in the bottom left figure, and a quadratic function fitted to identify the geometric boundary of the spray as a function of charge pressure. For the penetration data , however, a mean image derived from several shots was required due to the transient effects at the front of the spray giving large differences between sprays from shot to shot. The PDA data complements the images by being able to define the cone in terms of peak velocities, sample count and minimum data validation. The time of arrival for the first droplets gives an indication of the penetration of the spray. Superimposition of the velocity field onto the images provides quantitative velocity information for the different parts of the spray. A similar analysis with the drop size field provides information on the mean drop sizes present in the different parts of the spray. A combined plot of a spray image and droplet velocity vectors are shown in the figure on the right.

• 一般社団法人日本機械学会の論文
• 2001-07-01

著者

• Pitcher G.

  Lotus Engineering

• Wigley G.

  Department of Aero and Auto Engineering, Loughborough University

• Law D.

  Lotus Engineering

• Schneider B.

  Swiss Federal Institute of Technology

• Rogers S.

  Department of Aero and Auto Engineering, Loughborough University

• Wigley G.

  Department Of Aero And Auto Engineering Loughborough University

• Rogers S.

  Department Of Aero And Auto Engineering Loughborough University

関連論文

• (2-01) Effect of Compression Pressure on the Spray Morphology of GDI Pressure-Swirl Injectors((SI-1)S. I. Engine Combustion 1-Direct Injection Engines)

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