Indiana University-Purdue University Indianapolis (IUPUI) / In order to conform to pollutant-control regulations and minimize NOx emissions,
modern household boilers and central heating systems are moving toward premixed
combustors. These combustors have been successful with regards to emissions along with
efficiency. However, their implementation has been associated with acoustical instability
problems that could be solved through precise optimization in design rather than trial and
error experimentation.
This thesis introduces an experimental apparatus, which is designed to investigate
the acoustic instability problem at the flame level. The goal is an experimental
determination of the flame transfer function and comparison of the experimental data
with a theoretical model of the flame. An experimental procedure is designed to diagnose
the origins of the combustion instabilities by measurement of the flame transfer function.
This research is carried out in three steps. The first step is to understand the
acoustic instability problem through study of the theoretical models of the flame transfer
function and selection of a model, which is most functional in industrial applications. A
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measurement technique for the flame transfer function is developed according to the
required accuracy in measurements, repeatability, and configurability for a wide range of
operating conditions. Subsequently, an experimental apparatus is designed to
accommodate the flame transfer function measurement technique. The components of the
acoustic system are carefully sized to achieve precise measurement of the system
parameters such as flows, pressures, and acoustic responses, and the apparatus is built.
The apparatus is operated to measure the flame transfer function at several operating
conditions.
The experimentally measured flame transfer function is compared with a
theoretical model for further verification. The experimental apparatus provides an
improved assessment of the acoustic instability problem for industrial applications.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/3366 |
| Date | 08 1900 |
| Creators | Hojatpanah, Roozbeh |
| Contributors | Nalim, M. Razi, Anwar, Sohel, Zhu, Likun |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
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