A two-equation turbulence model and its application to a buoyant diffusion flame

• Published in: International journal of heat and mass transfer Vol. 42; no. 7; pp. 1305 - 1315
• Main Authors: Yan, Zhenghua, Holmstedt, Göran
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.04.1999; Elsevier
• Subjects: Applied sciences; Building Technologies; Civil Engineering; Combustion. Flame; Energiteknik; Energy; Energy Engineering; Energy. Thermal use of fuels; Engineering and Technology; Exact sciences and technology; Husbyggnad; Maskinteknik; Mechanical Engineering; Samhällsbyggnadsteknik; Teknik; Theoretical studies; Theoretical studies. Data and constants. Metering; Diffusion flame; Soot; Buoyancy; Numerical simulation; Combustion; Modeling; Propane
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(98)00206-3

A modified k– ε two-equation turbulence model was developed to improve the consideration of the important buoyancy effect on turbulence and turbulent transport, which is a serious deficiency of the standard buoyancy-modified k– ε model. The present model was tested against both plane and axisymmetric thermal plumes and a buoyant diffusion flame. The model was found to be stable, computationally economic, promising and applicable to complex situations. The predicted plume spreading rates and velocity and temperature profiles agreed well with experimental measurements. When compared with the standard buoyancy-modified k– ε turbulence model, this model gives significantly improved numerical results.