- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Theses and Dissertations /
- Soot measurements using Laser Induced Incandescence...
Open Collections
UBC Theses and Dissertations
UBC Theses and Dissertations
Soot measurements using Laser Induced Incandescence for ethene combustion under engine-relevant conditions Yeung, Michael Kam Ho
Abstract
With growing concerns over the detrimental effects of soot emission, it has become important to study possible emission reduction strategies and explore new measurement techniques to advance soot diagnostic capabilities. In this study, the potential of using nitrogen as a fuel diluent to reduce soot is measured in a series of combustion experiments under engine-relevant conditions using Laser Induced Incandescence (LU). In the first part of this research, a calibration was conducted to allow conversion of LIT signals into soot mass concentration values. This calibration was performed by measuring samples of different, but known, soot concentration with LII under different configurations. Secondly, a test plan was designed for this study using a statistical design-of-experiment technique, response surface methodology (RSM). The concept of R SM is to conduct a small number of experiments strategically and use the results to create an empirical model. Using this approach, a test matrix of 135 experiments was developed. Finally, combustion experiments were carried out in a shock tube. In these experiments, soot concentration within a combusting ethene jet was measured with LII. The LII results were then processed and used as inputs for building the empirical models, from which the following trends were observed: • . Addition of nitrogen was observed to lower the levels of soot within the fuel jet. • Increases in pre-combustion temperature reduced the level of soot detected. • Changes in fuel injection pressure and pre-combustion pressure were observed to cause competing effects on the level of soot detected. This might be caused by underlying changes in air fuel ratio associated with changes in the two pressures. The results of this work indicate fuel dilution with nitrogen can be a potential soot reduction strategy for non-premixed gaseous-fuelled combustion systems. This study also shows that the ability to instantaneously generate a map of soot distribution within a combusting fuel jet makes LII more powerful than traditional soot diagnostic techniques.
Item Metadata
Title |
Soot measurements using Laser Induced Incandescence for ethene combustion under engine-relevant conditions
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
2007
|
Description |
With growing concerns over the detrimental effects of soot emission, it has become
important to study possible emission reduction strategies and explore new measurement
techniques to advance soot diagnostic capabilities. In this study, the potential of using
nitrogen as a fuel diluent to reduce soot is measured in a series of combustion
experiments under engine-relevant conditions using Laser Induced Incandescence (LU).
In the first part of this research, a calibration was conducted to allow conversion of LIT
signals into soot mass concentration values. This calibration was performed by
measuring samples of different, but known, soot concentration with LII under different
configurations.
Secondly, a test plan was designed for this study using a statistical design-of-experiment
technique, response surface methodology (RSM). The concept of R SM is to conduct a
small number of experiments strategically and use the results to create an empirical
model. Using this approach, a test matrix of 135 experiments was developed.
Finally, combustion experiments were carried out in a shock tube. In these experiments,
soot concentration within a combusting ethene jet was measured with LII. The LII
results were then processed and used as inputs for building the empirical models, from
which the following trends were observed:
• . Addition of nitrogen was observed to lower the levels of soot within the fuel jet.
• Increases in pre-combustion temperature reduced the level of soot detected.
• Changes in fuel injection pressure and pre-combustion pressure were observed to
cause competing effects on the level of soot detected. This might be caused by
underlying changes in air fuel ratio associated with changes in the two pressures.
The results of this work indicate fuel dilution with nitrogen can be a potential soot
reduction strategy for non-premixed gaseous-fuelled combustion systems. This study
also shows that the ability to instantaneously generate a map of soot distribution within a
combusting fuel jet makes LII more powerful than traditional soot diagnostic techniques.
|
Genre | |
Type | |
Language |
eng
|
Date Available |
2011-02-16
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
DOI |
10.14288/1.0080688
|
URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
|
Campus | |
Scholarly Level |
Graduate
|
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.