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Direct numerical simulation of a non-premixed impinging jet flame

Jiang, Xi and Zhao, Hua and Luo, Kai H. (2007) Direct numerical simulation of a non-premixed impinging jet flame. Journal of heat transfer-Transactions of the asme, 129 (8). pp. 951-957. ISSN 0022-1481

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Abstract

A non-premixed impinging jet flame at a Reynolds number 2000 and a nozzle-to-plate distance of two jet diameters was investigated using direct numerical simulation (DNS). Fully three-dimensional simulations were performed employing high-order numerical methods and high-fidelity boundary conditions to solve governing equations for variable-density flow and finite-rate Arrhenius chemistry. Both the instantaneous and time-averaged flow and heat transfer characteristics of the impinging flame were examined. Detailed analysis of the near-wall layer was conducted. Because of the relaminarization effect of the wall, the wall boundary layer of the impinging jet is very thin, that is, in the regime of viscous sublayer It was found that the law-of-the-wall relations for nonisothermal flows in the literature need to be revisited. A reduced wall distance incorporating the fluid dynamic viscosity was proposed to be used in the law-of-the-wall relations for nonisothermal flows, which showed improved prediction over the law of the wall with the reduced wall distance defined in terms of fluid kinematic viscosity in the literature. Effects of external perturbation on the dynamic behavior of the impinging flame were found to insignificant.

Item Type: Article
Journal or Publication Title: Journal of heat transfer-Transactions of the asme
Uncontrolled Keywords: direct numerical simulation ; heat transfer ; impinging flame ; law-of-the-wall ; viscous sublayer ; wall ; HEAT-TRANSFER CHARACTERISTICS ; TURBULENT CHANNEL FLOW ; WALL INTERACTION ; BOUNDARY-CONDITIONS ; COMBUSTION ; DYNAMICS ; SCHEMES ; SURFACE ; FLUXES
Subjects:
Departments: Faculty of Science and Technology > Engineering
ID Code: 51188
Deposited By: ep_importer_pure
Deposited On: 21 Nov 2011 11:11
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:22
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51188

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