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Development and implementation of optical diagnostics for spray characterizations
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Xiao, Pan (2012) Development and implementation of optical diagnostics for spray characterizations. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2683264~S1
Abstract
Research in the field of engine technology has been motivated by the desire to meet
increasingly stringent exhaust emissions while consistently improving the performance
and efficiency. An important way to achieve this goal is to enhance the performance of
the fuel injection system. A better and detailed understanding of spray evolution and
atomization is therefore both fundamentally and practically essential. The following
work describes the development and implementation of a series of optical spray
diagnostic techniques for a spray characteristics investigation for Wankel engine
application. The work focused on visually accessing the spray evolution and
atomization process and analyzing the spray characteristics on both macroscopic (100
mm×100 mm) and microscopic scales (2mm×2mm).
This work presents an experimental investigation into the spray characteristics of
aviation fuel (Jet-A) from a customized single-hole injector using Direct photography
with the laser sheet illumination technique. The spray imaging system developed
visualizes the spray development process with respect to the time elapsed. The spray
characteristics such as spray penetration, spray angle and projected area at various
conditions are quantitatively measured and analyzed using the image analysis program
developed using the Matlab image processing interface in order to obtain a better
understanding of the effect on aviation fuel of using specifically designed fuel injector.
An image analysis sizing method has been successfully developed. It based on
quantitatively analyzing the degree of image focus on the intensity gradient and image
contrast value across a droplet shadow image. A specialised optical diagnostics system
has been designed specifically for measuring droplet size under investigation ranging
from 4 μm to 100 μm. This method has been assessed by performing a series of preliminary experiments and comparing the results obtained at the various testing
conditions. A specialised droplet sizing and analysis software which makes use of the
Matlab language has been developed and proved to be an effective and affordable
droplet sizing tool to explore the spray microscopic characteristics.
Furthermore, this study conducts a successful application of a combination of
Droplet image analysis sizing method and Direct photography with laser sheet
illumination technique for a two-hole nozzle with a pre-heating module. It is applied to
acquire both spray macroscopic characteristics and also the droplet images in the
microscopic region (2 mm by 2 mm) of interest. Further analyses are implemented to
measure the droplet size and then explore the effect of ambient conditions on droplet
size, volume and ellipticity distribution using aviation fuel.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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Library of Congress Subject Headings (LCSH): | Particle size determination, Drops, Fluid dynamic measurements, Laser Doppler velocimeter, Particle image velocimetry | ||||
Official Date: | March 2012 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Bryanston-Cross, P. | ||||
Extent: | xix, 245 leaves : illustrations, charts. | ||||
Language: | eng |
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