Effects of stretch and radiation on the laminar burning velocity of R-32/air flames. (27th May 2020)

• Record Type: Journal Article
• Authors: Hegetschweiler, Michael; Pagliaro, John; Berger, Lukas; Hesse, Raik; Beeckmann, Joachim; Pitsch, Heinz; Linteris, Gregory
• Is Part Of: Science and technology for the built environment. Volume 26:Number 5(2020)
• Page Start: 599
• Page End: 609
• Publication Date: 2020-05-27
• Subjects: Heating -- Periodicals; Ventilation -- Periodicals; Air conditioning -- Periodicals; Refrigeration and refrigerating machinery -- Periodicals; Indoor air quality -- Periodicals; Indoor air quality; Air conditioning; Heating; Refrigeration and refrigerating machinery; Ventilation; Periodicals; 697
• DOI: 10.1080/23744731.2020.1717244
• Languages: English
• ISSNs: 2374-474X

Abstract

Abstract : Experiments are performed for outwardly propagating spherical flames of R-32/air mixtures at constant pressure. A high-speed video camera captures shadowgraph images from which the flame radius as a function of time is extracted. Direct numerical simulations with an optically thin radiation model and detailed kinetics are performed to predict the flame radius and study the effects of stretch and radiation on the inferred laminar burning velocity. The simulations accurately predict the observed flame radius as a function of time. Analyses of the simulation results show that both stretch and radiation effects are important, occur concurrently, and make extraction of the unstretched adiabatic laminar burning velocity from the experimental data difficult.