Noise generation by turbulence interaction with a rotor

Savell, C. T.

doi:10.2514/6.1977-1322

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A Theory To Include Blade-to-blade Correlation Effects2

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1978

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“…Incorporation of blade-to-blade correlation of unsteady lift into Sevik's analysis is presented in the following. Consider the aerodynamic frequency response functions of equation (5). The subscript on this function refers to a particular spanwise element of a propeller blade and the summation is over all spanwise elements.…”

Section: A Theory To Include Blade-to-blade Correlation Effectsmentioning

confidence: 99%

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Propeller Unsteady Thrust due to Operation in Turbulent Inflows

Thompson

1978

Volume 1A: General

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In order to better understand the broadband radiated sound and vibrations due to a propulsor blade row operating in a turbulent inflow, an experimental and analytical investigation of the unsteady thrust response of a series of propellers due to operation in turbulent inflows having various characteristic parameters was conducted. The propeller variable considered was blade spacing. The turbulence variables considered were characteristic length scale and intensity. Homogeneous, isotropic turbulence was considered. The propeller unsteady thrust spectra were measured for each propeller over a range of turbulent inflow conditions. Comparisions of experimental spectra with those due to two different analytical methods are made. Conclusions are drawn regarding the accuracy of the two analytical methods.

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Section: A Theory To Include Blade-to-blade Correlation Effectsmentioning

confidence: 99%

“…The functions, Gh91l(w) and GhQ22(w), are defined in equation (5). Substituting these expressions for Ghgll() and Gh22(w) into equation (11) results in…”

Section: A Theory To Include Blade-to-blade Correlation Effectsmentioning

confidence: 99%

Propeller Unsteady Thrust due to Operation in Turbulent Inflows

Thompson

1978

Volume 1A: General

View full text Add to dashboard Cite

show abstract

Noise generation by turbulence interaction with a rotor

Cited by 1 publication

References 3 publications

Propeller Unsteady Thrust due to Operation in Turbulent Inflows

Propeller Unsteady Thrust due to Operation in Turbulent Inflows

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