Concentric multi-annular swirl burner: Stability limits and emission characteristics

1977 ◽  
Vol 16 (1) ◽  
pp. 79-91 ◽  
Author(s):  
A.K. Gupta ◽  
J.M. Beér ◽  
J. Swithenbank
Keyword(s):  
Emission Characteristics ◽  
Swirl Burner ◽  
Stability Limits

scholarly journals Flame stability limits of premixed low-swirl combustion

2018 ◽  
Vol 10 (9) ◽  
pp. 168781401879087 ◽  
Author(s):  
Yinli Xiao ◽  
Zhibo Cao ◽  
Changwu Wang
Keyword(s):  
Flow Field ◽  
Vortex Breakdown ◽  
Flame Structure ◽  
Field Measurements ◽  
Operating Conditions ◽  
Oh Radicals ◽  
Flame Stability ◽  
Atmospheric Conditions ◽  
Swirl Burner ◽  
Stability Limits

The objective of this study is to gain a fundamental understanding of the flow-field and flame behaviors associated with a low-swirl burner. A vane-type low-swirl burner with different swirl numbers has been developed. The velocity field measurements are carried out with particle image velocimetry. The basic flame structures are characterized using OH radicals measured by planar laser-induced fluorescence. Three combustion regimes of low-swirl flames are identified depending on the operating conditions. For the same low-swirl injector under atmospheric conditions, attached flame is first observed when the incoming velocity is too low to generate vortex breakdown. Then, W-shaped flame is formed above the burner at moderate incoming velocity. Bowl-shaped flame structure is formed as the mixture velocity increases until it extinct. Local extinction and relight zones are observed in the low-swirl flame. Flow-field features and flame stability limits are obtained for the present burner.

Flame Stability Limits and Emission Characteristics of an Ammonia Micro Gas Turbine Burner

2016 ◽  
Vol 2016 (0) ◽  
pp. E214
Author(s):  
Ekenechukwu C. Okafor ◽  
Kazuma Sakai ◽  
Akihiro Hayakawa ◽  
Taku Kudo ◽  
Hideaki Kobayashi ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Emission Characteristics ◽  
Flame Stability ◽  
Micro Gas Turbine ◽  
Stability Limits ◽  
Gas Turbine Burner

Characterization of ALM Swirl Burner Surface Roughness and its Effects on Flame Stability Using High-Speed Diagnostics

2019 ◽  
Author(s):  
Jon Runyon ◽  
Anthony Giles ◽  
Richard Marsh ◽  
Daniel Pugh ◽  
Burak Goktepe ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Gas Turbine ◽  
Gas Turbines ◽  
High Speed ◽  
Flame Stabilization ◽  
Flame Stability ◽  
Post Processing ◽  
Swirl Burner ◽  
Stability Limits ◽  
Near Wall

Abstract The use of metallic Additive Layer Manufacturing (ALM) is an active area of development for gas turbine components, particularly concerning novel combustor prototypes for micro gas turbines. However, further study is required to understand the influence of this manufacturing technique and subsequent post-processing on the resulting burner component surface roughness and its effect on flame stability. In this study, two Inconel 625 swirl nozzle inserts with identical bulk geometry (swirl number, Sg = 0.8) were constructed via ALM for use in a generic gas turbine swirl burner. Further post-processing by grit blasting of one swirl nozzle insert results in a quantifiable change to the surface roughness characteristics in the burner exit nozzle when compared with the unprocessed ALM swirl nozzle insert or a third nozzle insert which has been manufactured using traditional machining methods. An evaluation of the influence of variable surface roughness effects from these swirl nozzle inserts is therefore performed under preheated isothermal and combustion conditions for premixed methane-air flames at thermal power of 25 kW. High-speed velocimetry at the swirler exit under isothermal air flow conditions gives evidence of the change in near-wall boundary layer thickness and turbulent fluctuations resulting from the change in nozzle surface roughness. Under atmospheric combustion conditions, this influence is further quantified using a combination of dynamic pressure, high-speed OH* chemiluminescence, and exhaust gas emissions measurements to evaluate the flame stabilization mechanisms at the lean blowoff and rich stability limits. Notable differences in flame stabilization are evident as the surface roughness is varied, and changes in rich stability limit were investigated in relation to changes in the near-wall turbulence intensity. Results show the viability of using ALM swirl nozzles in lean premixed gas turbine combustion. Furthermore, precise control of in-process or post-process surface roughness of wetted surfaces can positively influence burner stability limits and must therefore be carefully considered in the ALM burner design process as well as CFD models.

Flame stability limits of low swirl burner − Effect of fuel composition and burner geometry

Fuel ◽  
2017 ◽  
Vol 208 ◽  
pp. 410-422 ◽  
Author(s):  
M. Saediamiri ◽  
M. Birouk ◽  
J.A. Kozinski
Keyword(s):  
Fuel Composition ◽  
Flame Stability ◽  
Swirl Burner ◽  
Stability Limits

The Effect of Swirl Burner Design Configuration on Combustion and Emission Characteristics of Lean Pre-vaporized Premixed Flames

Energy ◽  
2021 ◽  
pp. 120622
Author(s):  
Belal Y. Belal ◽  
Gesheng Li ◽  
Zunhua Zhang ◽  
H.M. El-Batsh ◽  
Hany A. Moneib ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Emission Characteristics ◽  
Swirl Burner ◽  
Burner Design

Methane-Oxygen Flame Stability in a Generic Premixed Gas Turbine Swirl Combustor at Varying Thermal Power and Pressure

2015 ◽  
Author(s):  
Jon Runyon ◽  
Richard Marsh ◽  
Agustin Valera-Medina ◽  
Anthony Giles ◽  
Steve Morris ◽  
...  
Keyword(s):  
Burning Velocity ◽  
Thermal Power ◽  
Stability Limit ◽  
Gas Analysis ◽  
Pure Oxygen ◽  
Swirl Burner ◽  
Stability Range ◽  
Burner Exit ◽  
Exit Nozzle ◽  
Stability Limits

At low thermal power (<5 kW) conditions, nitrogen and carbon dioxide were added as diluents to a premix of methane-oxygen in an atmospheric generic swirl burner. Results indicate that CO2-diluted oxy-methane flames have a wider stability range than N2-diluted flames in terms of overall oxygen concentration in the premix. Bulk flow Reynolds number, augmented by varying the size of the burner exit nozzle, was also found to increase the stability limits of flames diluted with both CO2 and N2, as the increased flow velocity offsets the higher burning velocity of the oxyfuel mixture. A combination of differing transport properties between diluents and the resulting flame chemistry produces a change in the structure of the premixed oxyfuel swirl flame, shown by combustion PIV to affect the observed lean and rich stability limits. Utilising the results at low thermal power conditions, enhanced-oxygen combustion of a methane-air flame was investigated in a pressurized generic swirl burner operating at higher thermal power (<50 kW) conditions and pressures up to 3 bar absolute. Over a range of increasing thermal powers, it is seen that a relatively small amount of pure oxygen addition can shift the equivalence ratio at which the lean stability limit or rich stability limit are reached compared with the same phenomenon observed for a methane-air flame. Pressurised operation with CO2 dilution up to 15.5 mol% was validated through stability limit and emissions gas analysis, giving further support to the use of exhaust gas recirculation in premixed swirl-stabilized burners for oxyfuel combustion.

scholarly journals Characterization of Additive Layer Manufacturing Swirl Burner Surface Roughness and Its Effects on Flame Stability Using High-Speed Diagnostics

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Jon Runyon ◽  
Anthony Giles ◽  
Richard Marsh ◽  
Daniel Pugh ◽  
Burak Goktepe ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Thermal Power ◽  
Flame Stabilization ◽  
Swirl Burner ◽  
Additive Layer Manufacturing ◽  
Layer Manufacturing ◽  
Variable Surface ◽  
Stability Limits ◽  
Near Wall

Abstract In this study, two Inconel 625 swirl nozzle inserts with identical bulk geometry were constructed via additive layer manufacturing (ALM) for use in a generic gas turbine swirl burner. Further postprocessing by grit blasting of one swirl nozzle insert results in a quantifiable change to the surface roughness characteristics when compared with the unprocessed ALM swirl nozzle insert or a third nozzle insert which has been manufactured using traditional machining methods. An evaluation of the influence of variable surface roughness effects from these swirl nozzle inserts is therefore performed under preheated isothermal and combustion conditions for premixed methane-air flames at thermal power of 25 kW. High-speed velocimetry at the swirler exit under isothermal conditions gives evidence of the change in near-wall boundary layer thickness and turbulent fluctuations resulting from the change in nozzle surface roughness. Under atmospheric combustion conditions, this influence is further quantified using a combination of dynamic pressure, high-speed OH* chemiluminescence, and exhaust gas emissions measurements to evaluate the flame stabilization mechanisms at the lean blowoff and rich stability limits. Notable differences in flame stabilization are evident as the surface roughness is varied, and changes in rich stability limit were investigated in relation to changes in the near-wall turbulence intensity. Results show that precise control of in-process or postprocess surface roughness of wetted surfaces can positively influence burner stability limits and NOx emissions and must, therefore, be carefully considered in the ALM burner design process as well as computational fluid dynamics (CFD) models.

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