Experimental study of impact of swirl number as well as oxygen and carbon dioxide content in natural gas combustion air on flame flashback and blow-off

Jerzak, Wojciech; Kuźnia, Monika

doi:10.1016/j.jngse.2015.12.054

Cited by 49 publications

(22 citation statements)

References 23 publications

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“…Overall, the minimum swirl number was above 1.4 at the top of the combustor, which is higher than the critical value of 0.6 that distinguishes between the weak and strong swirl flow characteristics. 31 Therefore, it can be concluded that the configuration of this combustor was able to achieve a strong swirl flow throughout the chamber which is essential for the attainment of flameless combustion operating conditions.…”

Section: Swirl Flow Distributionmentioning

confidence: 98%

“…31 For a better understanding of the strength of the swirl and turbulent flow characteristics, turbulent intensity (TI) is an important indicating parameter on flow instability inside the chamber. Swirl number can be considered as a major indication of the strength of the swirl flow that promotes the internal circulation of gas inside the chamber and makes flameless combustion achievable.…”

Section: Swirl and Turbulent Flow Distributionmentioning

confidence: 99%

“…A swirl number value of 0.6 is considered as the cross-line between weak and strong swirl flow characteristics. 31 For a better understanding of the strength of the swirl and turbulent flow characteristics, turbulent intensity (TI) is an important indicating parameter on flow instability inside the chamber. Turbulent intensity can be defined as a ratio of the root mean square of velocity fluctuations (V rms ) over the average velocity magnitude (V in ) 32 ; V rms is a function of turbulent kinetic energy (k) by V rms = ffiffiffiffiffiffiffiffiffiffiffiffiffi ffi 2=3 ð Þk p ).…”

Section: Swirl and Turbulent Flow Distributionmentioning

confidence: 99%

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Swirl flow field analysis of producer gas premixed charge in a flameless cyclone combustor

2018

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Summary The flow dynamics of producer gas premixed charge in a cyclone combustor was investigated using the computational fluid dynamic modeling. Two main variables to achieve high swirl flow and reactant dilution were the flow rate of the reactants and nozzle diameter. The first variable showed a considerable effect on the in‐combustor residence time reducing from 0.64 to 0.44 seconds when the reactant flow rate increases from 0.037 to 0.057 kg/second. While its effect on the swirl flow distribution and flameless conditions was not significant, as indicated by the steady swirl number and reactant dilution degree averaging 2.5% and 58%, respectively. On the other hand, decreasing the nozzle diameter from 50 to 20 mm was more beneficial for the enhancement of reactant dilution and swirl flow distribution as they increased from 58% to 78% and 2.5 to 3.4, respectively. The result also showed that reducing the nozzle diameter below 40 mm is suitable for the present configuration of the combustor to be effectively operated in flameless combustion mode. However, the smallest diameter (20 mm) resulted in more fluctuations of the axial velocity profile, which may lead to highly turbulent fluid dynamic features.

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Section: Swirl Flow Distributionmentioning

confidence: 98%

Section: Swirl and Turbulent Flow Distributionmentioning

confidence: 99%

Section: Swirl and Turbulent Flow Distributionmentioning

confidence: 99%

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Swirl flow field analysis of producer gas premixed charge in a flameless cyclone combustor

2018

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“…Emissions of CO and NOx Jerzak W. [10] Experimental study Premixed combustion of natural gas in quartz tube chamber Effect of the vortex number and, oxygen content in the fuel in reverse flows and flame instability Wu Y et al [11] Numerical study…”

Section: Premixed Combustion Of Methane In a Annular Combustion Chamber And Channelmentioning

confidence: 99%

Micro-modular air driven combustion nozzle: Experimental and numerical modelling studies towards optimal geometric design

Dostiyarov

Садыкова

2022

THERM SCI

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Experimental and numerical modelling studies on optimized design of micro-modular air driven combustion nozzle have been developed. Moreover, optimal angle of outlet swirler (vortex generator) connected in series with the nozzle has been analyzed in the context of minimization of NOx in the flue gases. Numerical modelling by ANSYS verifying the experimental data has been carried out. It has been established that an angle of about 20 degree of the outlet vortex generator has been able to assure optimal flame length and combustion efficiency.

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“…Beer and Syred [31] indicated that flows with high-intensity turbulence have a range of swirl numbers between 0.6 and 2.5. Several studies have analyzed the variation of swirl to improve combustion in flames [9,10,15,16,29,[32][33][34][35].…”

Section: Effect Of Swirling Flows In Flamesmentioning

confidence: 99%

Numerical and Experimental Analysis of the Effect of a Swirler with a High Swirl Number in a Biogas Combustor

et al. 2021

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Climate change as a worldwide phenomenon is the cause of multinational agreements such as the Kyoto Protocol and the Paris Agreement with the goal of reducing greenhouse gas emissions. Biogas is one of the most promising biofuels for the integration of clean energy sources; however, biogas has the disadvantage of a low calorific value. To overcome this problem, mechanical devices such as swirlers are implemented in combustion chambers (CCs) to increase their combustion efficiencies. A swirler induces rotation in the airstream that keeps a constant re-ignition of the air–fuel mixture in the combustion. We present the numerical modeling using computational fluid dynamics (CFD) and experimental testing of combustion with biogas in a CC, including an optimized swirler in the airstream with a swirl number (Sn) of 2.48. A turbulence model of the renormalization group (RNG) was used to analyze the turbulence. Chemistry was parameterized using the laminar flamelet model. The numerical model allows visualizing the recirculation zone generated at the primary zone, and partially at the intermediate zone of the CC caused by the strong swirl. Temperature distribution profiles show the highest temperatures located at the intermediate and dilution zones, with the last one being a characteristic feature of biogas combustion. A strong swirl in the airstream generates low-velocity zones at the center of the CC. This effect centers flame, avoiding hot spots near the flame tube and flashback at the structural components. Regarding pollutant emissions, the goal of a biogas that generates less pollutants than nonrenewable gases is accomplished. It is observed that the mole fraction of NO in the CC is close to zero, while the mole fraction of CO2 after combustion is lowered compared to the original mole fraction contained in the biogas (0.25). The mole fraction of CO2 obtained in experimental tests was 0.0127. Results obtained in the numerical model for temperatures and mole fractions of CO2 and NO show a behavior similar to that of the experimental model. Experimental results for mole fraction of CO emissions are also presented and have a mean value of 0.0009. This value lies within allowed pollutant emissions for CO according to national environmental regulations.

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Experimental study of impact of swirl number as well as oxygen and carbon dioxide content in natural gas combustion air on flame flashback and blow-off

Cited by 49 publications

References 23 publications

Swirl flow field analysis of producer gas premixed charge in a flameless cyclone combustor

Swirl flow field analysis of producer gas premixed charge in a flameless cyclone combustor

Micro-modular air driven combustion nozzle: Experimental and numerical modelling studies towards optimal geometric design

Numerical and Experimental Analysis of the Effect of a Swirler with a High Swirl Number in a Biogas Combustor

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