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

Effect of Swirl on Combustion Characteristics in Premixed Flames

1998 ◽  
Vol 120 (3) ◽  
pp. 488-494 ◽  
Author(s):  
A. K. Gupta ◽  
M. J. Lewis ◽  
S. Qi
Keyword(s):  
High Frequency ◽  
Flame Structure ◽  
Premixed Flames ◽  
Temperature Data ◽  
Local Temperature ◽  
Local Distribution ◽  
Swirl Burner ◽  
Swirl Number ◽  
High Frequency Response ◽  
Global And Local

A double concentric premixed swirl burner is used to examine the structure of two different methane-air premixed flames. Direct flame photography together with local temperature data provides an opportunity to investigate the effects of swirl number distribution in each annulus on the global and local flame structure, flame stability and local distribution of thermal signatures. An R-type thermocouple compensated for high-frequency response is used to measure the local distribution of thermal signatures in two different flames, each of which represents a different of thermal signatures in two different flames, each of which represents a different of thermal signatures in two combination of swirl number in the swirl burner. In order to improve the accuracy of the temperature data at high-frequency conditions, information on the thermocouple time constant are also obtained under prevailing conditions of local temperature and velocity by compensating the heat loss from the thermocouple sensor bead. These results assist in quantifying the degree of thermal nonuniformities in the flame signatures as affected by the distribution of swirl and to develop strategies for achievinguniform distribution of temperatures in flames.

Measurements of the turbulent burning velocity and the structure of premixed flames on a low-swirl burner

2000 ◽  
Vol 28 (1) ◽  
pp. 359-366 ◽  
Author(s):  
T. Plessing ◽  
C. Kortschik ◽  
N. Peters ◽  
M.S. Mansour ◽  
R.K. Cheng
Keyword(s):  
Burning Velocity ◽  
Premixed Flames ◽  
Swirl Burner ◽  
Turbulent Burning Velocity

Scattering and Generation of Acoustic Energy by a Premix Swirl Burner

2007 ◽  
Author(s):  
Alexander Gentemann ◽  
Wolfgang Polifke
Keyword(s):  
Experimental Data ◽  
Acoustic Waves ◽  
Narrow Range ◽  
Scattering Matrix ◽  
Acoustic Energy ◽  
Analytical Models ◽  
Design Strategies ◽  
Swirl Burner ◽  
Burner Design ◽  
Acoustic Stability

The scattering and generation of acoustic energy by a premix swirl burner is scrutinized. The analysis is formulated in terms of the scattering matrix of the burner, determined by a combination of computational fluid dynamics and system identification as well as experiment supplemented with simple analytical models for flame frequency response and burner transfer matrix. Remarkably, it is found that in a narrow range of frequencies, incoming acoustic waves are amplified strongly by the unsteady heat release, i.e. acoustic energy is generated. Although the computational and experimental data were obtained for one specific swirl burner design, further analysis suggests that such behavior should be common for many burner designs. Consequences for thermo-acoustic stability as well as burner and combustor design strategies are discussed.

Experimental investigation of stabilization and emission characteristics of ammonia/air premixed flames in a swirl combustor

2017 ◽  
Vol 42 (19) ◽  
pp. 14010-14018 ◽  
Author(s):  
Akihiro Hayakawa ◽  
Yoshiyuki Arakawa ◽  
Rentaro Mimoto ◽  
K.D. Kunkuma A. Somarathne ◽  
Taku Kudo ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Premixed Flames ◽  
Emission Characteristics ◽  
Swirl Combustor

scholarly journals Effect of Swirl on Combustion Characteristics in Premixed Flames

1997 ◽  
Author(s):  
S. Qi ◽  
A. K. Gupta ◽  
M. J. Lewis
Keyword(s):  
High Frequency ◽  
Flame Structure ◽  
Premixed Flames ◽  
Temperature Data ◽  
Local Temperature ◽  
Local Distribution ◽  
Swirl Burner ◽  
Swirl Number ◽  
High Frequency Response ◽  
Global And Local

A double concentric premixed swirl burner is used to examine the structure of two different methane-air premixed flames. Direct flame photography together with local temperature data provides an opportunity to investigate the effects of swirl number distribution in each annulus on the global and local flame structure, flame stability and local distribution of thermal signatures. An R-type thermocouple compensated for high-frequency response is used to measure the local distribution of thermal signatures in two different flames, each of which represents a different combination of swirl number in the swirl burner. In order to improve the accuracy of the temperature data at high-frequency conditions, information on the thermocouple time constant are also obtained under prevailing conditions of local temperature and velocity by compensating the heat loss from the thermocouple sensor bead. These results assist in quantifying the degree of thermal nonuniformities in the flame signatures as affected by the distribution of swirl and to develop strategies for achieving uniform distribution of temperatures in flames.

Swirl Distribution Effects on the Thermal Characteristics of Premixed Flames

2001 ◽  
Author(s):  
Sean Archer ◽  
Ashwani K. Gupta
Keyword(s):  
Time Scales ◽  
Premixed Flames ◽  
Power Spectra ◽  
Thermal Characteristics ◽  
Recirculation Region ◽  
Emission Characteristics ◽  
Operational Conditions ◽  
Mean Temperature ◽  
Integral Time ◽  
Outer Annulus

Abstract An experimental investigation has been carried out on four premixed flames using a double concentric swirl burner. The influence of radial distribution of swirl on the global flame behavior, thermal and emission characteristics have been determined. Temperature data was compensated with time constant data to generate mean and fluctuating temperature maps, probability density distributions of temperature, power spectra and thermal integral- and micro-time scales in the flames. Direct flame photographs were taken to archive flame shape and light intensity. These data provided valuable information for practical combustors on better swirl configurations. These configurations will depend heavily on the designed power settings. Contributed results directly from this investigation are for a lean premixed flame to achieve low emission and higher efficiency. The results reveal that in a counter-swirl configuration, the swirl strength in inner annulus should be greater than the outer annulus. However, for the co-swirl configuration it is more beneficial to have smaller swirl strength in the inner annulus than the outer annulus. It is found that premixed flames can possess significant circumferential non-uniformities at all flow and operational conditions. Detailed data shows that the flame thermal field and temperature distribution is strongly related to its emissions. High NOx emission is found in flames where the integral time scales and the mean temperature are high in the presumed lower recirculation region. High CO formation is found in flames that have high integral time scales in the lower recirculation region but have a low mean temperature in this same region. Thermal time scales provide important information on the thermal and emission characteristics of premixed flames.

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