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Frequency-domain prediction of broadband inflow noise radiating from a finite-thickness airfoil
https://orcid.org/0000-0001-9721-5398
https://orcid.org/0000-0002-5150-7712
Abstract The purpose of this study is to develop a semi-analytic model for the prediction of broadband inflow noise of an airfoil in the frequency-domain, which can account for the effects of real airfoil geometry on the radiated sound pressure field in both phases of propagation and generation of aerodynamic sound. First, an acoustic transfer function is analytically derived to account for airfoil geometry’s effects in the propagation phase. The algebraic attenuation model is then combined to consider the effects of incident turbulence distortion in the generation phase. Predictions using the semi-analytic model provide much closer agreements with the measurements than the analytic model in a broader range of frequency and mean flow speed. Besides, the model is shown to reproduce a more realistic directivity of broadband inflow noise by including a drag-type loading source due to the finite thickness of an airfoil as well as a lift-type one.
Highlights A semi-analytic model is developed for the prediction of broadband inflow noise of an airfoil. . The model can account for airfoil geometry effects in generation and propagation phases of airfoil inflow noise. . An acoustic transfer function is derived to consider airfoil geometry effects in the propagation phase. The algebraic attenuation model is employed to consider airfoil geometry effects in the generation phase. Predictions using the semi-analytic model provide close agreements with the measurements. The present model reproduces a more realistic directivity of broadband inflow noise. .
Frequency-domain prediction of broadband inflow noise radiating from a finite-thickness airfoil
https://orcid.org/0000-0001-9721-5398
https://orcid.org/0000-0002-5150-7712
Abstract The purpose of this study is to develop a semi-analytic model for the prediction of broadband inflow noise of an airfoil in the frequency-domain, which can account for the effects of real airfoil geometry on the radiated sound pressure field in both phases of propagation and generation of aerodynamic sound. First, an acoustic transfer function is analytically derived to account for airfoil geometry’s effects in the propagation phase. The algebraic attenuation model is then combined to consider the effects of incident turbulence distortion in the generation phase. Predictions using the semi-analytic model provide much closer agreements with the measurements than the analytic model in a broader range of frequency and mean flow speed. Besides, the model is shown to reproduce a more realistic directivity of broadband inflow noise by including a drag-type loading source due to the finite thickness of an airfoil as well as a lift-type one.
Highlights A semi-analytic model is developed for the prediction of broadband inflow noise of an airfoil. . The model can account for airfoil geometry effects in generation and propagation phases of airfoil inflow noise. . An acoustic transfer function is derived to consider airfoil geometry effects in the propagation phase. The algebraic attenuation model is employed to consider airfoil geometry effects in the generation phase. Predictions using the semi-analytic model provide close agreements with the measurements. The present model reproduces a more realistic directivity of broadband inflow noise. .
Frequency-domain prediction of broadband inflow noise radiating from a finite-thickness airfoil
https://orcid.org/0000-0001-9721-5398
https://orcid.org/0000-0002-5150-7712
Abstract The purpose of this study is to develop a semi-analytic model for the prediction of broadband inflow noise of an airfoil in the frequency-domain, which can account for the effects of real airfoil geometry on the radiated sound pressure field in both phases of propagation and generation of aerodynamic sound. First, an acoustic transfer function is analytically derived to account for airfoil geometry’s effects in the propagation phase. The algebraic attenuation model is then combined to consider the effects of incident turbulence distortion in the generation phase. Predictions using the semi-analytic model provide much closer agreements with the measurements than the analytic model in a broader range of frequency and mean flow speed. Besides, the model is shown to reproduce a more realistic directivity of broadband inflow noise by including a drag-type loading source due to the finite thickness of an airfoil as well as a lift-type one.
Highlights A semi-analytic model is developed for the prediction of broadband inflow noise of an airfoil. . The model can account for airfoil geometry effects in generation and propagation phases of airfoil inflow noise. . An acoustic transfer function is derived to consider airfoil geometry effects in the propagation phase. The algebraic attenuation model is employed to consider airfoil geometry effects in the generation phase. Predictions using the semi-analytic model provide close agreements with the measurements. The present model reproduces a more realistic directivity of broadband inflow noise. .
Frequency-domain prediction of broadband inflow noise radiating from a finite-thickness airfoil
Lee, Gwang-Se (author) / Cheong, Cheolung (author)
2021-03-26
Article (Journal)
Electronic Resource
English
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