CUED Publications database

Velocity and Reactive Scalar Dissipation Spectra in Turbulent Premixed Flames

Kolla, H and Zhao, XY and Chen, JH and Swaminathan, N (2016) Velocity and Reactive Scalar Dissipation Spectra in Turbulent Premixed Flames. Combustion Science and Technology, 188. pp. 1424-1439. ISSN 0010-2202

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Abstract

© 2016, Published with license by Taylor & Francis Group, LLC © Hemanth Kolla, Xin-Yu Zhao, Jacqueline H. Chen, and N. Swaminathan. Dissipation spectra of velocity and reactive scalars—temperature and fuel mass fraction—in turbulent premixed flames are studied using direct numerical simulation data of a temporally evolving lean hydrogen-air premixed planar jet (PTJ) flame and a statistically stationary planar lean methane-air (SP) flame. The equivalence ratio in both cases was 0.7, the pressure 1 atm while the unburned temperature was 700 K for the hydrogen-air PTJ case and 300 K for methane-air SP case, resulting in data sets with a density ratio of 3 and 5, respectively. The turbulent Reynolds numbers for the cases ranged from 200 to 428.4, the Damköhler number from 3.1 to 29.1, and the Karlovitz number from 0.1 to 4.5. The dissipation spectra collapse when normalized by the respective Favre-averaged dissipation rates. However, the normalized dissipation spectra in all the cases deviate noticeably from those predicted by classical scaling laws for constant-density turbulent flows and bear a clear influence of the chemical reactions on the dissipative range of the energy cascade.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:08
Last Modified: 18 Nov 2017 21:40
DOI: