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Modelling of a bluff-body stabilised premixed flames close to blow-off

Amzin, Shokri and Mohd. Yasin, Mohd. Fairus (2021) Modelling of a bluff-body stabilised premixed flames close to blow-off. Computation, 9 (4). pp. 1-15. ISSN 2079-3197

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Official URL: http://dx.doi.org/10.3390/computation9040043

Abstract

As emission legislation becomes more stringent, the modelling of turbulent lean premixed combustion is becoming an essential tool for designing efficient and environmentally friendly combustion systems. However, to predict emissions, reliable predictive models are required. Among the promising methods capable of predicting pollutant emissions with a long chemical time scale, such as nitrogen oxides (NOx), is conditional moment closure (CMC). However, the practical application of this method to turbulent premixed flames depends on the precision of the conditional scalar dissipation rate, <Nc |?>, model. In this study, an alternative closure for this term is implemented in the RANS-CMC method. The method is validated against the velocity, temperature, and gas composition measurements of lean premixed flames close to blow-off, within the limit of computational fluid dynamic (CFD) capability. Acceptable agreement is achieved between the predicted and measured values near the burner, with an average error of 15%. The model reproduces the flame characteristics, some discrepancies are found within the recirculation region due to significant turbulence intensity.

Item Type:Article
Uncontrolled Keywords:CMC, Conditional scalar dissipation rate, Lean, Pollutants, Premixed
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:97952
Deposited By: Widya Wahid
Deposited On:10 Nov 2022 01:22
Last Modified:10 Nov 2022 01:22

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