Suppression of thermo-acoustic instability using air injection in horizontal Rijke tube

Deshmukh, Nilaj N.; Sharma, S. D.

doi:10.1016/j.joei.2016.03.001

Cited by 39 publications

(15 citation statements)

References 33 publications

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“…The leaner the flame, the lower is the emission of nitrogen oxides (NO X ); thus, the operation of the combustion chamber lies close to the flame blowout by design [3,4]. Consequently, a high understanding of combustion dynamics, especially thermo-acoustic oscillations [5], is required to prevent operational failures [6]. There are numerous papers available on the investigation of blowout using various time series analyses [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls

Novotni

Józsa

2020

Acoustics

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Swirl burners are widely used in numerous practical applications since they are characterized by low pollutant emission and a wide operating range. Besides reliable operation, a burner must fulfill noise emission regulations, which is often a sound pressure level in dB(A) when people are affected. Therefore, the present paper evaluates the overall sound pressure level (OASPL) variation of a 15-kW liquid-fueled turbulent atmospheric swirl burner at various setups. Firstly, the combustion air flow rate was adjusted, which induced a swirl number modification due to the fixed swirl vanes. Secondly, the atomizing pressure of the plain-jet airblast atomizer was modified, which also affected the swirl number. High atomizing air jets notably increased combustion noise by intensifying the shear layer. Thirdly, a geometrical modification was performed; 0°–60° half cone angle quarls in 15° steps were installed on the lip of the baseline burner for extended flame stability. By filtering the OASPL to the V-shaped flames, a linearly decreasing trend was observed as a function of swirl number. Their derivative also has a linearly decreasing characteristic as a function of the atomizing pressure.

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Section: Introductionmentioning

confidence: 99%

Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls

Novotni

Józsa

2020

Acoustics

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“…Several methods for damping combustion instability in Rijke tubes have been tested. Some recent works include the use of injected air [6], use of an adaptive system with an external loudspeaker to uncouple acoustic pressure oscillations and unsteady heat release [7], Helmholtz resonators [8,9], and the addition of a secondary heater [10]. A recent overview of passive acoustic dampers and potential challenges associated with implementation of the dampers to real-world engines is given by Zhao and Li [11].…”

Section: Nomenclaturementioning

confidence: 99%

“…Lp 20log 10 P rms P ref (6) where P rms is the rms of unsteady pressure as measured by the pressure transducer during the time period of interest, and…”

Section: Electrode Placementmentioning

confidence: 99%

Electric Field Damping of Rijke Tube Combustion Instabilities

Henderson

2018

Journal of Propulsion and Power

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A direct-current electric field was investigated as a damping method for thermoacoustic instabilities generated in a horizontal Rijke tube driven by a premixed propane torch. Electrode lengths of 2.54, 5.08, and 15.24 cm were used with electrode locations relative to the burner tip of −4.60, −2.06, and 0.458 cm and voltages up to 4.68 kV being tested. Electrodes downstream of the burner tip, rather than surrounding the burner, and longer electrodes were most effective at damping instabilities. Damping also increased with applied voltage. These findings held true for both laminar and turbulent flames and were in agreement with theoretical predictions made based on two-dimensional static electric field models. Sound pressure level reductions up to 21 dB for the laminar flame, which completely damped the instability, and 4.4 dB for the turbulent flame were seen using the 15.24 cm electrode at 4.68 kV. When the entire Rijke tube acted as the electrode, a reduction of 19 dB was seen for the turbulent flame at 9 kV, which suppressed the instability. The damping effect was attributed to stabilization of the oscillating flame and its unsteady heat release, driven by the combustion instability pressure fluctuations, via the ionic wind.

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“…Eliminating combustion instability with JICF around the burner nozzle has been demonstrated in the past. Previous studies 13–21 showed the application of JICF on combustion instability, which summarized various JICF methods and their control characteristics. They summarized the variation characteristics of flame–vortex interaction under different JICF.…”

Section: Introductionmentioning

confidence: 99%

“…They proved that thermoacoustic instability and NO x emissions could be suppressed simultaneously. Deshmukh and Sharma 21 examined the combustion instability control with injectors installed in the wall of the Rijke tube; the phase difference between sound pressure and flame chemiluminescence under JICF increased significantly. The flame was shrunk in size as the injection flow rate increases, and the Rayleigh index of the flame was declined.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon dioxide, argon, and helium jets on the synchronous control of combustion instability and NO_x emission

Tao

Zhou

2020

Asia-Pacific J Chem Eng

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This article experimentally studies the synchronous control of combustion instability and NOx emission in a model gas turbine combustor. The application of tabular jet in cross flow was adopted to test the effectiveness of synchronous control. The flow rate, height, direction, and relative molecular masses were studied in this research. Results suggest that the ideal damping ratio of the sound pressure amplitude can be as high as 73.7% under the carbon dioxide jet in cross flow case. The carbon dioxide jet in cross flow case can lead to a better thermoacoustic instability suppression result than the instances of argon or helium. Besides, amplitude and frequency switching of the unsteady flame emerged during the experiment. Adding minimal inert gaseous can change the local oscillation of equivalence ratio. The suppression ratio of NOx emission can reach as high as 44% under the carbon dioxide cases, which performs better than the argon or helium cases. Moreover, the flame length declines as the tabular jet in cross flow rate increases. When the flow rate increases (or the height decreases), the size of the flame front or root will decrease. The average flame length dropped from 122 to 41 mm. The macrostructure of the flame changes significantly under different injecting heights or directions. This article can serve as a specific guideline for the passive control of thermoacoustic instability in gas turbine, rocket, and industrial burners.

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Suppression of thermo-acoustic instability using air injection in horizontal Rijke tube

Cited by 39 publications

References 33 publications

Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls

Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls

Electric Field Damping of Rijke Tube Combustion Instabilities

Effect of carbon dioxide, argon, and helium jets on the synchronous control of combustion instability and NO_x emission

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Suppression of thermo-acoustic instability using air injection in horizontal Rijke tube

Cited by 39 publications

References 33 publications

Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls

Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls

Electric Field Damping of Rijke Tube Combustion Instabilities

Effect of carbon dioxide, argon, and helium jets on the synchronous control of combustion instability and NOx emission

Contact Info

Product

Resources

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Effect of carbon dioxide, argon, and helium jets on the synchronous control of combustion instability and NO_x emission