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Article Dans Une Revue Energy Procedia Année : 2017

Global stability analysis of lifted diffusion flames

Résumé

This work describes the development of a method for the global hydrodynamic stability analysis of diffusion flames. The low-Machnumber (LMN) Navier–Stokes (NS) equations for reacting flows are solved together with a transport equation for the mixture fraction describing the local composition of the fluid. The equations are solved by the spectral-element code NEK5000 with Legendre polynomial reconstruction of degree twelve and second-order accurate Runge-Kutta time integration scheme. In order to compute the base flow for the stability analysis, a selective frequency damping approach has been employed. The global stability analysis has been performed by a matrix-free time-stepper algorithm applied to the LMN-NS equations, using an Arnoldi method to compute the most unstable modes. Moreover, a numerical linearization of the governing equation is employed, which allows one to study the stability of diffusion flames without the direct evaluation and storage of the linearized operator. Therefore, a remarkable reduction of the storage capacity is achieved and a more flexible numerical approach is obtained. The numerical model has been validated by comparison with the results for the axisymmetric diffusion flame available in the literature.
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Dates et versions

hal-02454163 , version 1 (24-01-2020)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

Citer

C. Mancini, Mirko Farano, P. de Palma, Jean-Christophe Robinet, S. Cherubini. Global stability analysis of lifted diffusion flames. Energy Procedia, 2017, ATI 2017 - 72nd Conference of the Italian Thermal Machines Engineering Association, 126, pp.867-874. ⟨10.1016/j.egypro.2017.08.292⟩. ⟨hal-02454163⟩
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