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Volume 36, Issue 6
June 2024
Research Article| June 11 2024
Qingyu Meng (孟庆钰)
;
Qingyu Meng (孟庆钰) a)
(Software, Validation, Writing – original draft, Writing – review & editing)
College of Power and Energy Engineering, Harbin Engineering University
, Harbin 150001,
People's Republic of China
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Zhenlin Ji (季振林)
Zhenlin Ji (季振林) b)
(Writing – review & editing)
College of Power and Energy Engineering, Harbin Engineering University
, Harbin 150001,
People's Republic of China
b)Author to whom correspondence should be addressed: ji*zhenlinhrb@163.com
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Author & Article Information
b)Author to whom correspondence should be addressed: ji*zhenlinhrb@163.com
a)
Electronic mail: mengqingyu1997@163.com
Physics of Fluids 36, 065123 (2024)
Article history
Received:
March 13 2024
Accepted:
May 21 2024
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Citation
Qingyu Meng, Zhenlin Ji; Prediction and analysis for airflow generated noise inside mufflers based on large eddy simulation and Morhing acoustic analogy. Physics of Fluids 1 June 2024; 36 (6): 065123. https://doi.org/10.1063/5.0208096
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The airflow generated noise inside a simple expansion chamber muffler is predicted by combining large eddy simulation and Morhing acoustic analogy in the present work, and a good agreement is observed between the prediction and measurement. Research indicates that wall pressure fluctuations are dominated by hydrodynamic pressure fluctuations at the distance of first three pipe diameters in the outlet pipe, and wall pressure fluctuations at the distance of six pipe diameters downstream are dominated by sound pressure fluctuations. The airflow generated noise is mainly attributed to the vortex generated by structural change in the muffler, and one observes strong influences at the longitudinal resonance frequency and antiresonance frequency of the expansion chamber. In addition, the effects of expansion chamber lengths, extensions of inlet/outlet, filleted structure, conical tube, and perforated tube on airflow generated noise are studied. Predicted results show that the filleted structure, conical tube, and perforated tube structure may reduce the airflow generated noise effectively.
Topics
Acoustical properties, Acoustic analogies, Microphones, Acoustic noise control, Acoustic signal processing, Computational models, Computer simulation, Computational fluid dynamics, Turbulence simulations
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© 2024 Author(s). Published under an exclusive license by AIP Publishing.
2024
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