An experimental investigation of a nonreacting multiple jet mixing with a confined crossflow has been conducted. Flow and geometric conditions were varied in order to examine favorable parameters for mixing. The requirement for a rapid and intense mixing process originates from combustion applications, especially the RQL-combustion concept. Thus, the jets were perpendicularly injected out of one opposed row of circular orifices into a heated crossflow in a rectangular duct. Spacing and hole size were varied within the ranges referring to combustor applications. The results presented are restricted to an in-line orientation of opposed jet axis. Temperature distribution, mixing rate, and standard deviation were determined at discrete downstream locations. Best, i.e., uniform mixing can be observed strongly depending on momentum flux ratio. For all geometries investigated, an optimum momentum flux ratio yields to a homogeneous temperature distribution in the flow field downstream of the injection plane. Overly high ratios deteriorate the mixing process due to the mutual impact of the opposed entraining jets along with a thermal stratification of the flowfield. Correlations are introduced describing the dependency of optimum momentum flux ratio on mixing hole geometry. They allow the optimization of jet-in-crossflow mixing processes in respect to uniform mixing.
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April 1997
Research Papers
Optimization of Multiple Jets Mixing With a Confined Crossflow
Th. Doerr,
Th. Doerr
Department of Flight Propulsion, Technical University Darmstadt, Darmstadt, Federal Republic of Germany
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M. Blomeyer,
M. Blomeyer
Department of Flight Propulsion, Technical University Darmstadt, Darmstadt, Federal Republic of Germany
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D. K. Hennecke
D. K. Hennecke
Department of Flight Propulsion, Technical University Darmstadt, Darmstadt, Federal Republic of Germany
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Th. Doerr
Department of Flight Propulsion, Technical University Darmstadt, Darmstadt, Federal Republic of Germany
M. Blomeyer
Department of Flight Propulsion, Technical University Darmstadt, Darmstadt, Federal Republic of Germany
D. K. Hennecke
Department of Flight Propulsion, Technical University Darmstadt, Darmstadt, Federal Republic of Germany
J. Eng. Gas Turbines Power. Apr 1997, 119(2): 315-321 (7 pages)
Published Online: April 1, 1997
Article history
Received:
March 15, 1995
Online:
November 19, 2007
Citation
Doerr, T., Blomeyer, M., and Hennecke, D. K. (April 1, 1997). "Optimization of Multiple Jets Mixing With a Confined Crossflow." ASME. J. Eng. Gas Turbines Power. April 1997; 119(2): 315–321. https://doi.org/10.1115/1.2815577
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