Mathematical Modeling of a 2. 25 MWtSwirling Natural Gas Flame. Part 1: Eddy Break-up Concept for Turbulent Combustion; Probability Density Function Approach for Nitric Oxide Formation
作者:
A. A. F. PETERS,
R. WEBER,
期刊:
Combustion Science and Technology
(Taylor Available online 1995)
卷期:
Volume 110-111,
issue 1
页码: 67-101
ISSN:0010-2202
年代: 1995
DOI:10.1080/00102209508951917
出版商: Taylor & Francis Group
关键词: Mathematical modeling;natural gas;turbulent diffusion flame;eddy break-up concept;nitric oxide formation;probability density functions
数据来源: Taylor
摘要:
Predictions and measurements of a swirling unstaged, high NOx, natural gas flame are presented. The predictions have been obtained by means of relatively simple models for turbulence, turbulent combustion, radiation and turbulent nitric oxide chemistry. Turbulence is modeled by means of the standard K-epsilon model. The turbulent combustion model incorporates a two-step reaction scheme together with an eddy break-up model. Radiation is computed by means of a four-flux method and the Exponential Wide Band Model is used to calculate local radiative properties. In the NO-chemistry model, thermal-NO and prompt-NO chemical reaction rates are statistically averaged using the Beta probability density function. The paper contains a unique comparison between measurements and predictions of a natural gas flame issued from an industrial-scale burner. Special attention is given to establishing the importance of thermal boundary conditions on both the energy balance and calculated NO emissions. The accuracy of the model predictions, including NO and CO emissions is established by carrying out appropriate sensitivity studies.
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