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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v38.i1.50
pages 45-56

Stabilization of Combustion of a Lean Mixture by a Coaxial Twisting Flow

V. I. Kaufman
P. I. Baranov Central Scientific Research Institute of Aircraft Engines, Moscow, Russian Federation
A. I. Mayorova
P. I. Baranov Central Scientific Research Institute of Aircraft Engines, Moscow, Russian Federation
Victor I. Yagodkin
P. I. Baranov Central Scientific Research Institute of Aircraft Engines, Moscow, Russian Federation

ABSTRAKT

Mixing in a tube of one-way twisted turbulent flows coming from two coaxial tubes is analyzed. The process of stabilization of combustion of a lean mixture by a small amount of rich-mixture combustion products was calculated numerically by a simple phenomenological combustion model. It is shown that flow twisting is an effective method for increasing the combustion efficiency; however, this can result in appearance of the region of flow instability with generation of a hysteresis loop. Optimal values of the governing parameters at which the flow mode is unique and the fuel is completely burnt at a distance of two gauges from the beginning of mixing have been found.


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