Repository: Freie Universit├Ąt Berlin, Math Department

Numerical Study of the Effective Impedance of a Thermoacoustic Stack

Worlikar, A.S. and Aniruddha, S. and Knio, O.M. and Klein, R. (1999) Numerical Study of the Effective Impedance of a Thermoacoustic Stack. Acta Acustica united with Acustica, 85 (4,). pp. 480-494. ISSN 1610-1928

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The force balance in the neighborhood of an idealized thermoacoustic stack is analyzed using two-dimensional unsteady flow simulations. The numerical model is based on a small-Mach-number approximation to the compressible Navier-Stokes equations; it ignores acoustic wave propagation within the stack but retains bulk compressibility and the convective nonlinearity of the original conservation equations. The effects of long wave acoustic pulses which drive the stack flow are taken into account through suitable velocity boundary conditions. The computations are used to characterize the effective impedance of the stack and to analyze its dependence on operating conditions and stack configuration parameters. Results are compared to semi-heuristic explicit formulas based on the linear theory.

Item Type:Article
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:518
Deposited By: Ulrike Eickers
Deposited On:08 Jul 2009 08:39
Last Modified:08 Jul 2009 08:39

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