Effects of multi-circular jet plates on the spray and flame characteristics of internal mixing air-assisted atomizer
The mixing of fuel and air plays a major role in the spray and flame behaviour, hence, affects the combustion performance and emissions of the internal mixing air�assisted atomizers. This research aims to determine the effects of multi-circular jet (MCJ) plates on the spray behavior and flame ch...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/944/1/24p%20SHAHRIN%20HISHAM%20AMIRNORDIN.pdf http://eprints.uthm.edu.my/944/2/SHAHRIN%20HISHAM%20AMIRNORDIN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/944/3/SHAHRIN%20HISHAM%20AMIRNORDIN%20WATERMARK.pdf |
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| Summary: | The mixing of fuel and air plays a major role in the spray and flame behaviour,
hence, affects the combustion performance and emissions of the internal mixing air�assisted atomizers. This research aims to determine the effects of multi-circular jet
(MCJ) plates on the spray behavior and flame characteristics of air assisted
atomizers. The MCJ plates provide the primary air entrance into the mixing chamber.
The plates are represented by P1, P2, and P3 characterized by the difference in the
open area ratio at 17.8, 18.4 and 18.9 respectively. Additionally, P1, P4, and P5 are
represented by the jet-hole angles at 0o
, 30o
and 45o
. In the experiments, the spray
and flame images of all plates are captured at equivalence ratios of 0.8 to 1.2 using a
Digital Single Lens Reflect camera. The flame temperatures are measured using the
infra-red imaging technique while the emissions, burning chamber and stack
temperature are also recorded using an emission gas analyzer and K-type
thermocouples respectively. Then the computational work is conducted by using
ANSYS Fluent to visualize the impact of plate geometry on the internal fluid flow
and spray structure. Further analysis using both experiments and simulations have
been carried out in order to compare between the P5 configuration and swirl. Results
show that a decrease in open area ratio and jet-hole angle increases the flame
temperature up to 11.4% and 13.8% respectively. The inclined jet-hole also increases
the velocity up to 47.7% and turbulence kinetic energy up to 62.4% in the mixing
chamber. In comparison between MCJ plate (P5) and swirl, P5 produces 33.8%
lower backpressure but produces higher flame temperature at 4.3%. The result
indicates that the MCJ plates are more effective in controlling the spray and flame
characteristics of the atomizer. The outcome of this work provides a deeper
understanding on the relations of geometry and fuel-air mixing to the characteristics
of the internal mixing air-assisted atomizer which will lead to the improvement of
burner systems in the future. |
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