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Effect of CO2 Opposing Multiple Jets on Thermoacoustic Instability and NOx Emissions in a Lean-Premixed Model Combustor

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Abstract

This paper experimentally studied the effect of CO2 opposing multiple jets on the thermoacoustic instability and NOx emissions in a lean-premixed model combustor. The feasibility was verified from three variables: the CO2 jet flow rate, hole numbers, and hole diameters of the nozzles. Results indicate that the control effect of thermoacoustic instability and NOx emissions show a reverse trend with the increase of open area ratio on the whole, and the optimal jet flow rate range is 1ȃ1 L/min with CO2 opposing multiple jets. In this flow rate range, the amplitude and frequency of the dynamic pressure and heat release signals CH* basically decrease as the CO2 flow rate increases, which avoids high-frequency and high-amplitude thermoacoustic instability. The amplitude-damped ratio of dynamic pressure and CH* can reach as high as 98.75% and 93.64% with an optimal open area ratio of 3.72%. NOx emissions also decrease as the jet flow rate increases, and the maximum suppression ratio can reach 68.14%. Besides, the flame shape changes from a steep inverted “V” to a more flat “M”, and the flame length will become shorter with CO2 opposing multiple jets. This research achieved the synchronous control of thermoacoustic instability and NOx emissions, which could be a design reference for constructing a safer and cleaner combustor.

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Abbreviations

CCD High-speed:

camera

CH* :

Chemiluminescence/arb.units

CH4 :

Methane

F c :

Suppression ratio of flame length/mm

\(\overline {{N_{\rm{c}}}}\) :

Average suppression ratio/%

OMJ:

Opposing multiple jets

P :

Thermal power/kW

S :

Swirl number

\(\overline {{v_{{\rm{i1}}}}}\) :

Average initial control rate of pressure amplitude/Pa·(L/min)−1

\(\overline {{v_{{\rm{i2}}}}}\) :

Average initial control rate of CH* intensity/arb.units(L/min)−1

η :

Open area ratio

Φ :

Equivalence ratio

φ :

Swirl vane angle/(°)

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Acknowledgments

This work was supported by the National Science Fund for Distinguished Young Scholars (Grant No. 51825605).

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  1. Institute for Thermal Power Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China

    Hao Zhou & Liubin Hu

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  1. Hao Zhou
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Correspondence to Hao Zhou.

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Zhou, H., Hu, L. Effect of CO2 Opposing Multiple Jets on Thermoacoustic Instability and NOx Emissions in a Lean-Premixed Model Combustor. J. Therm. Sci. 33, 207–221 (2024). https://doi.org/10.1007/s11630-023-1882-z

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  • DOI: https://doi.org/10.1007/s11630-023-1882-z

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