Abstract
A hot-wire concentration probe with a spatial resolution of 0.13 mm is used to measure concentration in a model cylindrical combustor. The flow inside the combustor is simulated by injecting a helium jet into a cylindrical confinement with or without swirling air flow present. Mean concentrations are essentially zero outside of the jet region, indicating complete confinement of the scalar field by the swirling flow. Consequently, concentration fluctuations are found to be relatively weak compared to velocity fluctuations, and are maximum off-axis at a point which corresponds to the interface between helium and air flows. However, in the absence of a swirling air flow, the helium diffuses quickly to fill the combustor. The resulting helium concentrations are constant and do not resemble the jet-like behavior of the velocity field.
Similar content being viewed by others
References
Ahmed, S. A.; So, R. M. C.; Mongia, H. C. 1985: Density effects on jet characteristics in confined swirling flow. Exp. Fluids 3, 231–238
Brown, G. L.; Rebollo, M. R. 1972: A small, fast-response probe to measure composition of a binary gas mixture. AIAA J. 10, 649–652
Brown, G. L.; Roshko, A. 1974: On density effects and large structure in turbulent mixing layers. J. Fluid Mech. 64, 775–816
D'Souza, G. J. 1968: Measurement of turbulent correlations in a coaxial flow of dissimilar fluids. NASA CR-960
Konrad, J. H. 1976: An experimental investigation of mixing in two-dimensional turbulent shear flows with applications to diffusions-limited chemical reactions. Project Squid Techn. Rep. CIT-8-PU, Purdue University
So, R. M. C.; Ahmed, S. A. 1984: Characteristics of confined turbulent gas jets. Preprints for the Symposium on Turbulence, University of Missouri-Rolla, 16-1 to 16-12
So, R. M. C.; Whitelaw, J. H.; Lapp, M. (ed.) 1984: Experimental measurements and techniques in turbulent reactive and nonreactive flows. ASME Special Publ. AMD-Vol. 66
So, R. M. C.; Ahmed, S. A.; Mongia, H. C. 1985: Jet characteristics in confined swirling flow. Exp. Fluids 3, 221–230
Stanford, R. A.; Libby, P. A. 1974: Further applications of hotwire anemometry to turbulence measurements in helium-air mixtures. Phys. Fluids 17, 1353–1361
Tan, C. S. 1980: An experimental study of the effects of swirl and density difference on mixing in shear flow. MIT GT and PDL Rpt. 153
Way, J.; Libby, P. A. 1970: Hot-wire probes for measuring velocity and concentration in helium-air mixtures. AIAA J. 8, 976–978
Way, J.; Libby, P. A. 1971: Application of hot-wire anemometry and digital techniques to measurements in a turbulent helium jet. AIAA J. 9, 1567–1573
Author information
Authors and Affiliations
Additional information
A version of this paper was presented at the ASME Winter Annual Meeting of 1984 and printed in AMD, Vol. 66
Rights and permissions
About this article
Cite this article
Ahmed, S.A., So, R.M.C. Concentration distributions in a model combustor. Experiments in Fluids 4, 107–113 (1986). https://doi.org/10.1007/BF00266567
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00266567