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Research Papers: Multiphase Flows

Studies of Swirl Burner Characteristics, Flame Lengths and Relative Pressure Amplitudes

[+] Author and Article Information
A. Valera-Medina, N. Syred

 Turbomachinery Dept. CIATEQ A.C., Querétaro, Mexico e-mail: agustin.valera@ciateq.mx Energy Institute, Cardiff University, Cardiff, UK e-mail: syredn@cf.ac.uk Gas Turbine Research, Cardiff University, Cardiff, UK

P. Bowen

 Turbomachinery Dept. CIATEQ A.C., Querétaro, Mexico e-mail: agustin.valera@ciateq.mxbowenpj@cf.ac.uk Energy Institute, Cardiff University, Cardiff, UK e-mail: syredn@cf.ac.ukbowenpj@cf.ac.uk Gas Turbine Research, Cardiff University, Cardiff, UKbowenpj@cf.ac.uk

A. Crayford

 Turbomachinery Dept. CIATEQ A.C., Querétaro, Mexico e-mail: agustin.valera@ciateq.mxcrayfordAP1@cardiff.ac.uk Energy Institute, Cardiff University, Cardiff, UK e-mail: syredn@cf.ac.ukcrayfordAP1@cardiff.ac.uk Gas Turbine Research, Cardiff University, Cardiff, UKcrayfordAP1@cardiff.ac.uk

J. Fluids Eng 133(10), 101302 (Sep 26, 2011) (11 pages) doi:10.1115/1.4004908 History: Received February 08, 2011; Revised August 15, 2011; Published September 26, 2011; Online September 26, 2011

Swirl stabilized combustion is a technology which, for stationary combustion, consumes more than 70 to 80% of the world’s fossil fuels. There have been many reviews of this technology, but there are still many gaps in understanding. This paper focuses on the general characteristics of a 100kW swirl burner, originally designed for poor quality fuels, in terms of flame characteristic, length and pressure fluctuations, to give a relative measure of the propensity of the system to respond to outside perturbations. Studied effects include swirl number, symmetry of the swirl flow system, type of fuel injector and mode of fuel injection. A range of techniques, including High Speed Photography (HSP), Particle Image Velocimetry (PIV) and fluctuating pressure measurements were used to create flame maps, flame length detail, and relative pressure amplitudes graphs. The results are discussed in the context of potential oscillations and coupling mechanisms including the effect of the precessing vortex core (PVC), recirculation and shear flow instabilities.

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Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Detail of swirl burner used. Removable inserts in inlets used to vary swirl number.

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Figure 4

(a) Flame map using configuration {50-50}, S = 2.02. (b) Flame map using configuration {25-25}, S = 1.06. Typical flames attached to the map [1]. refers to only one air inlet open; [2] refers to both inlets open.

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Figure 5

PIV phase locked axial radial velocities, configuration {25–25}, S = 1.08 with wide fuel injector. (a) Re ∼ 11,100, φ = 0.55; (b) Re ∼ 18,200, φ = 0.33; (c) Re ∼ 28,800, φ = 0.21; (d) Re ∼ 39,300, φ = 0.15; (e) Re ∼ 19,000, φ = 0.77; (f) Re ∼ 19,400, φ = 0.99; (g) Re ∼ 30,000, φ = 0.62; (h) Re ∼ 40,500, φ = 0.45.

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Figure 6

PIV phase locked axial radial velocities, configuration {25–25}, S = 1.08 with narrow fuel injector. (a) Re ∼ 11,100, φ = 0.55; (b) Re ∼ 18,200, φ = 0.33; (c) Re ∼ 28,800, φ = 0.21; (d) Re ∼ 39,300, φ = 0.15; (e) Re ∼ 19,000, φ = 0.77; (f) Re ∼ 19,400, φ = 0.99; (g) Re ∼ 30,000, φ = 0.62; (h) Re ∼ 40,500, φ = 0.45.

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Figure 7

S = 1.06 with {25–25}, flame length as a function of equivalence ratio for the narrow and wide injectors

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Figure 8

S = 1.16 with {0–50}, flame length as a function of equivalence ratio for the narrow and wide injectors

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Figure 9

S = 2.02 with {50–50}, flame length as a function of equivalence ratio for the narrow and wide injectors

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Figure 10

S = 2.02 with {50–50}, flame length as a function of equivalence ratio for the perforated injector

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Figure 11

Relative pressure amplitude with equivalence ratio for S = 1.06, {25–25}, narrow and wide injectors

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Figure 12

Relative pressure amplitude with equivalence ratio for S = 1.16 {0–25}, narrow and wide injectors

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Figure 13

Relative pressure amplitude with equivalence ratio for S = 2.02 {50–50}, narrow and wide injectors

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Figure 14

Relative pressure amplitude with equivalence ratio and perforated injector for S = 2.02, {50–50}

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