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Characterization of the Inlet Combustion Air in NIST's Reference Spray Combustion Facility: Effect of Vane Angle and Reynolds Number.


pdf icon Characterization of the Inlet Combustion Air in NIST's Reference Spray Combustion Facility: Effect of Vane Angle and Reynolds Number. (1533 K)
Widmann, J. F.; Charagundla, S. R.; Presser, C.

NISTIR 6458; 24 p. January 2000.

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB2000-102877

Keywords:

combustion; Reynolds number; turbulence; fluid mechanics; numerical analysis; validation; computational fluid dynamics

Abstract:

The airflow through a 12-vane cascade swirl generator is examined numerically to characterize the inlet combustion air in the reference spray combustion facility at NIST. A three-dimensional model is used to simulate the aerodynamics in the swirl generator that imparts the desired degree of angular momentum to the air in the annulus leading into the reactor. A parametric study is presented in which the effects of the vane angle and Reynolds number are examined. Reynolds numbers ranging from 5,000 to 30,000 and vane angles ranging from 30 deg to 60 deg are investigated. For a vane angle of 50 deg, which is the current operating condition of the swirl generator, a recirculation zone develops at the exit of the annulus for Reynolds number, Re = 9500. The Renormalization Group method (RNG) k-e turbulence model is used to model the transport, production, and dissipation of turbulence due to its superior performance (relative to the standard k-e turbulence model) for this type of flow.