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

Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3., 1111 Budapest, Hungary
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Acoustics 2020, 2(1), 131-146; https://doi.org/10.3390/acoustics2010010
Received: 3 October 2019 / Revised: 14 February 2020 / Accepted: 17 February 2020 / Published: 1 March 2020
(This article belongs to the Special Issue Aeroacoustics of Turbomachines)
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. View Full-Text
Keywords: swirl combustion; sound pressure level; combustion noise; liquid fuel combustion; quarl; lean combustion; turbulent combustion swirl combustion; sound pressure level; combustion noise; liquid fuel combustion; quarl; lean combustion; turbulent combustion
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MDPI and ACS Style

Novotni, G.I.; Józsa, V. Sound Pressure Level Analysis of a Liquid-Fueled Lean Premixed Swirl Burner with Various Quarls. Acoustics 2020, 2, 131-146.

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