Unsteady Propeller Forces, Fundamental Hydrodynamics [and] Unconventional Propulsion PDF Download
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![Unsteady Propeller Forces, Fundamental Hydrodynamics [and] Unconventional Propulsion PDF](https://books.google.com/books/content/images/frontcover/w15E1lnpCLIC?fife=w150-h200)
Author: Ralph D. Cooper
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ISBN:
Category : Hydrodynamics
Languages : en
Pages : 1700
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![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
![Unsteady Propeller Forces, Fundamental Hydrodynamics [and] Unconventional Propulsion PDF](https://books.google.com/books/content/images/frontcover/RO1hmwEACAAJ?fife=w80-h100)
Author: Stanley W. Doroff
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 1669
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Author: Lawrence Monti Casellini
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Category :
Languages : en
Pages : 73
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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).
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Category :
Languages : en
Pages :
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Category :
Languages : en
Pages : 0
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Author: A. Silverleaf
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Category :
Languages : en
Pages : 24
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Author: William Campbell Pfister
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Category : Naval architecture
Languages : en
Pages : 124
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Author: Stuart D. Jessup
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ISBN:
Category :
Languages : en
Pages : 60
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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: Charles Oliver Horton
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Category :
Languages : en
Pages : 232
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Author: Oddvar Frydenlund
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ISBN:
Category :
Languages : en
Pages : 19
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