Amiet theory extension to predict leading-edge generated noise in compact airfoils

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

This paper extends the Amiet theory to frequencies where the airfoil can be considered a compact noise source. The original Amiet theory proposes to apply the Schwarzschild theorem in an iterative procedure, which generally leads to noise over-prediction at low-frequencies. To overcome this problem, this paper proposes two extra iterations to the theory aiming to improve convergence. Since the second iteration of the classical Amiet theory presents approximate analytical solutions, this paper proposes correction formulas for maintaining the solution accuracy of further iterations written in terms of analytical expressions. Results show that adding two extra iterations contribute to improved convergence, and consequently improved noise prediction, in the frequency range of interest for applications such as contra-rotating-open-rotors, wind-turbines and turbomachines. Comparison with experiments shows significant improvement at frequencies where the airfoil is considered a compact noise source.
Original languageEnglish
Title of host publicationCFM 2015
Place of PublicationLyon, Frnce
Pages-
Publication statusPublished - 2015
Event22ème Congrès Français de Mécanique, CFM 2015 - Lyon, France
Duration: 24 Aug 201528 Aug 2015
Conference number: 22
http://documents.irevues.inist.fr/handle/2042/56915

Conference

Conference22ème Congrès Français de Mécanique, CFM 2015
Abbreviated titleCFM
CountryFrance
CityLyon
Period24/08/1528/08/15
Internet address

Fingerprint

Airfoils
Wind turbines
Rotors
Experiments

Keywords

  • IR-99149
  • METIS-315351

Cite this

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title = "Amiet theory extension to predict leading-edge generated noise in compact airfoils",
abstract = "This paper extends the Amiet theory to frequencies where the airfoil can be considered a compact noise source. The original Amiet theory proposes to apply the Schwarzschild theorem in an iterative procedure, which generally leads to noise over-prediction at low-frequencies. To overcome this problem, this paper proposes two extra iterations to the theory aiming to improve convergence. Since the second iteration of the classical Amiet theory presents approximate analytical solutions, this paper proposes correction formulas for maintaining the solution accuracy of further iterations written in terms of analytical expressions. Results show that adding two extra iterations contribute to improved convergence, and consequently improved noise prediction, in the frequency range of interest for applications such as contra-rotating-open-rotors, wind-turbines and turbomachines. Comparison with experiments shows significant improvement at frequencies where the airfoil is considered a compact noise source.",
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author = "{De Santana}, {Leandro Dantas} and C. Schram",
year = "2015",
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}

De Santana, LD & Schram, C 2015, Amiet theory extension to predict leading-edge generated noise in compact airfoils. in CFM 2015. Lyon, Frnce, pp. -, 22ème Congrès Français de Mécanique, CFM 2015, Lyon, France, 24/08/15.

Amiet theory extension to predict leading-edge generated noise in compact airfoils. / De Santana, Leandro Dantas; Schram, C.

CFM 2015. Lyon, Frnce, 2015. p. -.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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N2 - This paper extends the Amiet theory to frequencies where the airfoil can be considered a compact noise source. The original Amiet theory proposes to apply the Schwarzschild theorem in an iterative procedure, which generally leads to noise over-prediction at low-frequencies. To overcome this problem, this paper proposes two extra iterations to the theory aiming to improve convergence. Since the second iteration of the classical Amiet theory presents approximate analytical solutions, this paper proposes correction formulas for maintaining the solution accuracy of further iterations written in terms of analytical expressions. Results show that adding two extra iterations contribute to improved convergence, and consequently improved noise prediction, in the frequency range of interest for applications such as contra-rotating-open-rotors, wind-turbines and turbomachines. Comparison with experiments shows significant improvement at frequencies where the airfoil is considered a compact noise source.

AB - This paper extends the Amiet theory to frequencies where the airfoil can be considered a compact noise source. The original Amiet theory proposes to apply the Schwarzschild theorem in an iterative procedure, which generally leads to noise over-prediction at low-frequencies. To overcome this problem, this paper proposes two extra iterations to the theory aiming to improve convergence. Since the second iteration of the classical Amiet theory presents approximate analytical solutions, this paper proposes correction formulas for maintaining the solution accuracy of further iterations written in terms of analytical expressions. Results show that adding two extra iterations contribute to improved convergence, and consequently improved noise prediction, in the frequency range of interest for applications such as contra-rotating-open-rotors, wind-turbines and turbomachines. Comparison with experiments shows significant improvement at frequencies where the airfoil is considered a compact noise source.

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