Journal ArticleDOI
Combustion in swirling flows: A review
Nicholas Syred,János M. Beér +1 more
TLDR
The main effects of swirl are to improve flame stability as a result of the formation of toroidal recirculation zones and to reduce combustion lengths by producing high rates of entrainment of the ambient fluid and fast mixing as discussed by the authors.About:
This article is published in Combustion and Flame.The article was published on 1974-10-01. It has received 837 citations till now. The article focuses on the topics: Combustion chamber & Combustor.read more
Citations
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Journal ArticleDOI
Downstream boundary effects on the spectral characteristics of a swirling flowfield
TL;DR: In this paper, the spectral properties and structural response of a swirling flowfield are investigated subject to a non-axisymmetric disturbance and a contraction imposed downstream, and the dominant downstream instability frequency depends linearly on the inlet Reynolds number and on the mode of the breakdown.
Journal ArticleDOI
Suppression and excitation of the precessing vortex core by acoustic velocity fluctuations: An experimental and analytical study
TL;DR: In this article, it is shown how the precessing vortex core (PVC) instability is affected by axisymmetric acoustic velocity fluctuations as encountered at thermoacoustically unstable conditions.
Journal ArticleDOI
Experimental analysis of oxygen-methane combustion inside a gas turbine reactor under various operating conditions
Mohamed A. Habib,Medhat A. Nemitallah,Pervez Ahmed,Mostafa H. Sharqawy,Hassan M. Badr,Inam Muhammad,Mohamed Yaqub +6 more
TL;DR: In this article, the oxygen-methane diffusion flame taking place in a gas turbine reactor was investigated experimentally with emphasis on flame stability, where the oxidizer is a mixture of O2 and CO2 and the oxy-combustion process was studied at different equivalence ratios ranging from 0.5 to 1.0.
Journal ArticleDOI
A swirling jet under the influence of a coaxial flow
TL;DR: In this article, a 2D-DPIV model was used to study the mean and turbulent flow field generated by a swirling jet and a coaxial annular stream entering a pipe.
Journal ArticleDOI
Flow and mixing in swirling flow in a sudden expansion
W. L. H. Hallett,R. Günther +1 more
TL;DR: In this article, the effect of swirl intensity on flow and mixing was studied by measuring both time-mean values and turbulent fluctuations of the concentration of tracer gas with the main flow.
References
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Journal ArticleDOI
Theory of the vortex breakdown phenomenon
TL;DR: In this paper, it is shown that vortex breakdown is not a manifestation of instability or of any other effect indicated by study of infinitesimal disturbances alone, but instead a finite transition between two dynamically conjugate states of axisymmetric flow, analogous to the hydraulic jump in open-channel flow.
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On stationary and travelling vortex breakdowns
TL;DR: In this article, the authors describe some experiments in swirling flows in a diverging cylindrical tube in which various types of vortex breakdowns were observed, viz. mild (double helix) breakdown, spiral breakdown, and axisymmetric breakdown.
The bursting of leading-edge vortices - some observations and discussion of the phenomenon.
N. C. Lambourne,D. W. Bryer +1 more
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Experimental Investigation of Swirling Vortex Motion in Jets
N. A. Chigier,A. Chervinsky +1 more
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Some observations of the vortex breakdown phenomenon
TL;DR: In this article, a cylindrical vortex, formed in a long tube, was used to study the "vortex breakdown" that has been previously reported in investigations of the flow over slender delta wings.