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Simulation of Colorless Distributed Combustion

Olsson, Hampus LU (2019) MVKM01 20191
Department of Energy Sciences
Abstract
Colorless distributed combustion (CDC) is a promising novel technology to reduce emissions of carbon monoxide and nitrogen oxides in gas turbine combustors. CDC features a different flame regime than conventional gas turbine combustors, associated with a distributed reaction zone and low and uniform temperatures due to dilution of combustion air with exhaust gases. In this thesis, an attempt has been made at proposing a suitable simulation strategy in order to accurately predict reaction zone, temperature and pollutant emissions for methane-air combustion at an affordable computational cost. The simulations were performed in tandem with experiments on a specific combustor at the Combustion Laboratory of University of Maryland.
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Colorless distributed combustion (CDC) is a promising novel technology to reduce emissions of carbon monoxide and nitrogen oxides in gas turbine combustors. CDC features a different flame regime than conventional gas turbine combustors, associated with a distributed reaction zone and low and uniform temperatures due to dilution of combustion air with exhaust gases. In this thesis, an attempt has been made at proposing a suitable simulation strategy in order to accurately predict reaction zone, temperature and pollutant emissions for methane-air combustion at an affordable computational cost. The simulations were performed in tandem with experiments on a specific combustor at the Combustion Laboratory of University of Maryland.
The most popular approach in literature was found to be solution of the Reynolds-averaged Navier Stokes equations (RANS) with finite-rate chemistry as modeled by Eddy Dissipation Concept (EDC). Fluid dynamics and chemistry were simulated using the commercial computational fluid dynamics software Ansys Fluent. The non-reacting flow field was predicted using several two-equation and Reynolds stress (RSM) models. The results were compared to particle image velocitmetry (PIV) measurements of the flow field. The reacting flow was then simulated using different global reaction mechanisms and EDC model parameters. Numerical results were compared to experimentally obtained exhaust gas pollutant levels and flame front visualization by OH chemiluminescence.
Results showed best convergence performance using the realizable k (Less)
Popular Abstract
The increasing public concern for global warming and
air pollution is resulting in a call for increasingly "green"
power generation. The gas turbine is an increasingly popular device to generate
both electricity and heat for district heating, and many, if not
most, of them operate by burning natural gas. Colorless distributed
combustion, or CDC for short, is a new technology to reduce emissions produced in the gas turbine. This thesis serves as an introduction in how to use computer simulation to reduce cost and development time for new gas turbines using CDC technology. Despite difficulties in achieving accurate results, the simulations were still found to be an important tool, alongside experimental methods.
Please use this url to cite or link to this publication:
author
Olsson, Hampus LU
supervisor
organization
alternative title
A study of reaction zone, thermal field and pollutant emissions in a model laboratory combustor
course
MVKM01 20191
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Computational Fluid Dynamics, Combustion, Gas Turbine, Emission reduction, Flameless Combustion, Colorless Distributed Combustion
report number
LUTMDN/TMHP-19/5444-SE
ISSN
0282-1990
language
English
id
8992457
date added to LUP
2019-08-23 13:50:29
date last changed
2019-08-23 13:50:29
@misc{8992457,
  abstract     = {{Colorless distributed combustion (CDC) is a promising novel technology to reduce emissions of carbon monoxide and nitrogen oxides in gas turbine combustors. CDC features a different flame regime than conventional gas turbine combustors, associated with a distributed reaction zone and low and uniform temperatures due to dilution of combustion air with exhaust gases. In this thesis, an attempt has been made at proposing a suitable simulation strategy in order to accurately predict reaction zone, temperature and pollutant emissions for methane-air combustion at an affordable computational cost. The simulations were performed in tandem with experiments on a specific combustor at the Combustion Laboratory of University of Maryland.
The most popular approach in literature was found to be solution of the Reynolds-averaged Navier Stokes equations (RANS) with finite-rate chemistry as modeled by Eddy Dissipation Concept (EDC). Fluid dynamics and chemistry were simulated using the commercial computational fluid dynamics software Ansys Fluent. The non-reacting flow field was predicted using several two-equation and Reynolds stress (RSM) models. The results were compared to particle image velocitmetry (PIV) measurements of the flow field. The reacting flow was then simulated using different global reaction mechanisms and EDC model parameters. Numerical results were compared to experimentally obtained exhaust gas pollutant levels and flame front visualization by OH chemiluminescence.
Results showed best convergence performance using the realizable k}},
  author       = {{Olsson, Hampus}},
  issn         = {{0282-1990}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Simulation of Colorless Distributed Combustion}},
  year         = {{2019}},
}