Measurement of Multiple Blade Rate Unsteady Propeller Forces PDF Download
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Author: Stuart D. Jessup
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
An experimental investigation of unsteady propeller forces was conducted using model propellers operating in idealized axial wakes. Three-bladed propellers were operated behind 3-, 6-, 9- and 12-cycle wake screens generating blade rate and multiple axial wake inflow harmonics. The axial wake distributions were measured using a Pitot tube. Unsteady propeller bearing thrust and torque were measured with an unsteady force dynamometer. Measurements were compared to calculations using unsteady propeller lifting surface theory. Also, Laser Doppler Velocimetry (LDV) was used to measure the unsteady flow field about the propeller. LDV measurements were used to evaluate the effect of the propeller on the incoming wake. Keywords: Marine propellers; Unsteady loads; Bearing forces; Model tests; Propeller blades. (edc).
Author: Stuart D. Jessup
Publisher:
ISBN:
Category :
Languages : en
Pages : 60
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Book Description
An experimental investigation of unsteady propeller forces was conducted using model propellers operating in idealized axial wakes. Three-bladed propellers were operated behind 3-, 6-, 9- and 12-cycle wake screens generating blade rate and multiple axial wake inflow harmonics. The axial wake distributions were measured using a Pitot tube. Unsteady propeller bearing thrust and torque were measured with an unsteady force dynamometer. Measurements were compared to calculations using unsteady propeller lifting surface theory. Also, Laser Doppler Velocimetry (LDV) was used to measure the unsteady flow field about the propeller. LDV measurements were used to evaluate the effect of the propeller on the incoming wake. Keywords: Marine propellers; Unsteady loads; Bearing forces; Model tests; Propeller blades. (edc).
Author: Robert J. Boswell
Publisher:
ISBN:
Category :
Languages : en
Pages : 92
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Book Description
Objectives of the present study are to measure the unsteady forces and moments on a series of marine propellers due to circumferentially nonuniform inflow; to correlate the measured unsteady thrust and torque with calculated values, based on various proposed theories; and to investigate variation of unsteady thrust and torque over a range of pertinent parameters, using the method determined from those described to be the best available for calculating unsteady loading. Experimental blade-frequency thrust and torque were compared with values calculated by the following techniques: quasi-steady, two-dimensional unsteady, combination quasi-steady two-dimensional unsteady, and three-dimensional unsteady. The three-dimensional unsteady theory yields the best correlation with experiment; however, the numerical techniques employed breakdown for narrow-bladed propellers and for propellers with blade overlap.
Author: Lawrence Monti Casellini
Publisher:
ISBN:
Category :
Languages : en
Pages : 73
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Book Description
The problem of unsteady forces on a propeller operating in a non-uniform inflow and subjected to homogeneous, isotropic turbulence has been analyzed. Methods are presented for calculating the magnitude of the unsteady forces from these two causes. The theory is applied to a free-stream propeller operating in the wake of a single strut and in a turbulent flow. The calculations include variations of strut-to-propeller spacing, number of blades and blade sweep and show how unsteady forces are affected. In the case of a turbulent inflow, force spectra and the unsteady thrust coefficient are calculated. These quantities are seen to depend on two ratios: the characteristic eddy size divided by the propeller diameter, and the characteristic eddy size divided by the propeller blade chord length. It is shown that the unsteady forces due to turbulence are of the same order of magnitude as those due to a non-uniform inflow. (Author).
Author: Charles Oliver Horton
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Book Description
Author: Thomas J. Mueller
Publisher: Springer Science & Business Media
ISBN: 3662050587
Category : Technology & Engineering
Languages : en
Pages : 327
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Book Description
The book describes recent developments in aeroacoustic measurements in wind tunnels and the interpretation of the resulting data. The reader will find the latest measurement techniques described along with examples of the results.
Author: A. Silverleaf
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Book Description
Author: William Campbell Pfister
Publisher:
ISBN:
Category : Naval architecture
Languages : en
Pages : 124
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Book Description
![Unsteady Propeller Forces, Fundamental Hydrodynamics [and] Unconventional Propulsion PDF](https://books.google.com/books/content/images/frontcover/w15E1lnpCLIC?fife=w80-h100)
Author: Ralph D. Cooper
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 1700
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Book Description
Author: Robert J. Boswell
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Book Description
Author: Robert B. Zubaly
Publisher:
ISBN:
Category : Hulls (Naval architecture)
Languages : en
Pages : 160
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Book Description
