A numerical investigation of the airfoil-gust interaction noise in transonic flows: Acoustic processes

The sound produced by airfoil-gust interaction is a significant source of broadband noise in turbofan engines or contra-rotating open rotors (CRORs). There are competing mechanisms in this regime because of the presence of shocks that were seldom considered in the previous subsonic studies. A numeri...

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Published inJournal of sound and vibration Vol. 425; pp. 239 - 256
Main Authors Zhong, Siyang, Zhang, Xin, Gill, James, Fattah, Ryu, Sun, Yuhao
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 07.07.2018
Elsevier Science Ltd
Subjects
Acoustic noise
Acoustics
Aerodynamics
Airfoil-gust interaction
Broadband
Computational fluid dynamics
Engine noise
Flow velocity
Linearity
Noise control
Numerical analysis
Rotors
Scattering
Shocks
Sound propagation
Subsonic aircraft
Transonic flow
Turbofan engines
Turbulence
Airfoil-gust interaction
Transonic flow
Scattering
Shocks
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Abstract The sound produced by airfoil-gust interaction is a significant source of broadband noise in turbofan engines or contra-rotating open rotors (CRORs). There are competing mechanisms in this regime because of the presence of shocks that were seldom considered in the previous subsonic studies. A numerical investigation of airfoil-gust interaction noise at transonic speeds is undertaken in this work. By introducing vortical gust/synthetic turbulence to specified regions in the computational domain to interact with different elements in the flow field, it is shown that the dominant sound source is caused by leading edge-gust interaction. It is demonstrated that both streamwise and transverse disturbances interact with the near-field non-uniform mean flow and shocks can produce sound using a local gust injection method. The propagation of sound is significantly influenced by the presence of the shocks, and the far field radiation pattern is changed. We also study the effect of gust strength on the near and far field properties. The linearity is maintained for gust strength smaller than 1.0% of the mean flow velocity. Otherwise, the shocks may experience oscillations that will alter the near-field aerodynamics and far-field radiation.
AbstractList The sound produced by airfoil-gust interaction is a significant source of broadband noise in turbofan engines or contra-rotating open rotors (CRORs). There are competing mechanisms in this regime because of the presence of shocks that were seldom considered in the previous subsonic studies. A numerical investigation of airfoil-gust interaction noise at transonic speeds is undertaken in this work. By introducing vortical gust/synthetic turbulence to specified regions in the computational domain to interact with different elements in the flow field, it is shown that the dominant sound source is caused by leading edge-gust interaction. It is demonstrated that both streamwise and transverse disturbances interact with the near-field non-uniform mean flow and shocks can produce sound using a local gust injection method. The propagation of sound is significantly influenced by the presence of the shocks, and the far field radiation pattern is changed. We also study the effect of gust strength on the near and far field properties. The linearity is maintained for gust strength smaller than 1.0% of the mean flow velocity. Otherwise, the shocks may experience oscillations that will alter the near-field aerodynamics and far-field radiation.
Author Zhang, Xin
Sun, Yuhao
Zhong, Siyang
Gill, James
Fattah, Ryu
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  surname: Sun
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  organization: Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
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Transonic flow
Scattering
Shocks
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Snippet The sound produced by airfoil-gust interaction is a significant source of broadband noise in turbofan engines or contra-rotating open rotors (CRORs). There are...
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SubjectTerms Acoustic noise
Acoustics
Aerodynamics
Airfoil-gust interaction
Broadband
Computational fluid dynamics
Engine noise
Flow velocity
Linearity
Noise control
Numerical analysis
Rotors
Scattering
Shocks
Sound propagation
Subsonic aircraft
Transonic flow
Turbofan engines
Turbulence
Title A numerical investigation of the airfoil-gust interaction noise in transonic flows: Acoustic processes
URI https://dx.doi.org/10.1016/j.jsv.2018.04.010
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