Time-Dependent Thrust Generated by a Propeller Operating in a Turbulent Inflow PDF Download
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Author: D. E. Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
The broadband radiated sound of a propulsor can be related to the time-dependent thrust generated by the propulsor due to operation in a randomly varying turbulent velocity field. In order to understand better the radiated sound phenomenon, an experimental and theoretical investigation of the time-dependent thrust response of a propeller due to operation in turbulent inflows having various characteristic parameters was conducted. The experimental investigations employ an unsteady thrust balance mounted in the drive shaft of a 5-bladed free-stream propeller. Measurements of the time-dependent thrust generated by the propeller were made for turbulent inflows having a range of characteristics length scales and a range of turbulent intensity.
Author: D. E. Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
The broadband radiated sound of a propulsor can be related to the time-dependent thrust generated by the propulsor due to operation in a randomly varying turbulent velocity field. In order to understand better the radiated sound phenomenon, an experimental and theoretical investigation of the time-dependent thrust response of a propeller due to operation in turbulent inflows having various characteristic parameters was conducted. The experimental investigations employ an unsteady thrust balance mounted in the drive shaft of a 5-bladed free-stream propeller. Measurements of the time-dependent thrust generated by the propeller were made for turbulent inflows having a range of characteristics length scales and a range of turbulent intensity.
Author: David E. Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 227
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Book Description
The aability to accurately predict the magnitude and phase of the time-pendent forces and moments generated by the blades of a propulsor is important due to the possible resulting vibrations and/or radiated sound. The present thesis considers the time-dependent thrust response of an open propeller due to operating in both spatially and temporally varying flows. The experimental investigation consisted of measuring, in a water tunnel, the time-dependent thrust generated by a series of propellers operating first in various spatially nonuniform inflows and then in various turbulent inflows. The spatial variations were generated by an upstream strut, and the turbulence was generated by square mesh grids placed upstream of the propeller. Three propellers were considered. Measurements were made with each propeller operating over a range of advance ratios for each nonuniform inflow condition considered.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 384
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Book Description
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 838
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Book Description
Author: Pauline H. Gurewitz
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 364
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 384
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Book Description
Author:
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 478
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Book Description
Author: Pauline H. Gurewitz
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 384
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Book Description
Author: Pennsylvania State University
Publisher:
ISBN:
Category :
Languages : en
Pages : 702
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Book Description
Author: Donald E. Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
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Book Description
An experimental and theoretical investigation of the effects of chordwise velocity variations on the time-dependent thrust generated by a propeller operating in a spatially varying velocity field is described. It is shown that the effects of chordwise velocity variations can become substantial as the steady thrust on the propeller is increased.
