Effect of flame thickness variation on the mass burning rate of premixed counterflow flames with an oscillating strain rate

• Published in: Combustion theory and modelling Vol. 20; no. 1; pp. 173 - 188
• Main Authors: Iyer, Akshay Ganesh, van Oijen, Jeroen Adrianus, Boonkkamp, Johannes Hendrikas Maria ten Thije, de Goey, Laurentius Phlippus Hendrika
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 02.01.2016
• Subjects: area-based stretch; Burning rate; Combustion; Counterflow; flamelet model; flat counterflow flame; Integrals; Karlovitz integral; mass burning rate; mass-based stretch; Nonlinearity; Oscillating; Strain rate; thickness stretch; Unsteady
• ISSN: 1364-7830; 1741-3559
• DOI: 10.1080/13647830.2015.1122231

The mass-based stretch rate is used to study the response of premixed axisymmetric counterflow flames subject to an oscillating strain rate. Integral analysis is used to estimate the mass burning rate of the oscillating counterflow flames. From this study it can be concluded that the flame responds in a nonlinear manner. With an increase of the applied strain frequencies, it is found that unsteady stretch effects arising due to flame thickness variations become significant and the mass-based stretch rate is able to capture these nonlinear effects. The inclusion of these unsteady stretch effects in the mass-based stretch helps the integral analysis to predict the mass-burning rate of oscillating flames more accurately.