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Flame front propagation velocity measurement and in-cylinder combustion reconstruction using POET
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Hua, Cheng, (Researcher in engineering) (2012) Flame front propagation velocity measurement and in-cylinder combustion reconstruction using POET. PhD thesis, University of Warwick.
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WRAP_THESIS_Hua_2012.pdf - Submitted Version Download (16Mb) | Preview |
Official URL: http://webcat.warwick.ac.uk/record=b2678047~S1
Abstract
The objective of this thesis is to develop an intelligent diagnostic technique
POET (Passive Optical Emission Tomography) for the investigation of in cylinder
combustion chemiluminescence. As a non-intrusive optical system, the POET system
employs 40 fibre optic cables connected to 40 PMTs (Photo Multiplier Tube) to
monitor the combustion process and flame front propagation in a modified commercial
OHV (Over Head Valve) Pro 206 IC engine.
The POET approach overcomes several limitations of present combustion
research methods using a combination of fibre optic detection probes, photomultipliers
and a tomographic diagnostics. The fibre optic probes are placed on a specially
designed cylinder head gasket for non-invasively inserting cylinder. Each independent
probe can measure the turbulent chemiluminescence of combustion flame front at up to
20 kHz. The resultant intensities can then be gathered tomographically using MART
(Multiplicative Algebraic Reconstruction Technique) software to reconstruct an image
of the complete flame-front. The approach is essentially a lensless imaging technique,
which has the advantage of not requiring a specialized engine construction with
conventional viewing ports to visualize the combustion image. The fibre optic system,
through the use of 40, 2m long thermally isolated fibre optic cables can withstand
combustion temperatures and is immune from electronic noise, typically generated by
the spark plug.
The POET system uses a MART tomographic methodology to reconstruct the turbulent combustion process. The data collected has been reconstructed to produce a
temporal and spatial image of the combustion flame front. The variations of lame
turbulence are monitored by sequences of reconstructed images. Therefore, the POET
diagnostic technique reduces the complications of classic flame front propagation
measurement systems and successfully demonstrates the in-cylinder combustion
process.
In this thesis, a series of calibration exercises have been performed to ensure
that the photomultipliers of the POET system have sufficient temporal and spatial
resolution to quantitatively map the flow velocity turbulence and chemiluminescence
of the flame front. In the results, the flame has been analyzed using UV filters and blue
filters to monitor the modified natural gas fuel engine. The flame front propagation
speed has been evaluated and it is, on average, 12 m/s at 2280 rpm. Sequences of
images have been used to illustrate the combustion explosion process at different rpm.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Library of Congress Subject Headings (LCSH): | Flame, Tomography, Emission, Combustion -- Research, Photoelectric multipliers | ||||
Official Date: | May 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: | xxiii, 338 leaves : illustrations. | ||||
Language: | eng |
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