Accession Number:

ADA495159

Title:

Integrated Computational/Experimental Study of Turbulence Modification and Mixing Enhancement in Swirling Jets

Descriptive Note:

Final rept. 15 Aug 2005-14 Aug 2008

Corporate Author:

WYOMING UNIV LARAMIE

Report Date:

2009-01-07

Pagination or Media Count:

30.0

Abstract:

Swirling jet flows have been studied experimentally and computationally and the results have been compared with theory. Three-component Laser Doppler Anemometry LDA measurements have been carried out for swirling jets of various strengths and swirl distributions. Radial profiles of velocity have been obtained from the jet exit to 50 diameters downstream. The experimental results are consistent with previous results and with similarity theory for weakly swirling turbulent jets. However, the parametric range and spatial domain of the current data set makes it suitable for validation. Computational simulations have also been performed using a combination of Reynolds Averaged Navier-Stokes RANS and Large Eddy Simulation LES approaches. The results have been validated with experimental data and used to explore the mechanisms behind the increased mixing enhancement observed. The combined experimentalcomputational effort is still ongoing, but the experiences to date have demonstrated the effectiveness of such an approach.

Subject Categories:

  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE