Periodic Single-blade Loads on Propellers in Tangential and Longitudinal Wakes PDF Download
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Author:
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Category :
Languages : en
Pages :
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Book Description
Author:
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Category :
Languages : en
Pages :
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Author: Robert J. Boswell
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 0
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Book Description
Periodic single-blade loads were measured on model propellers in inclined flow and in a single-cycle circumferentially non-uniform longitudinal velocity field. The experimental results were correlated with predictions by the following methods: (1) A quasi-steady procedure developed by McCarthy at David W. Taylor Naval Ship Research and Development Center (DTNSRDC), (2) An unsteady lifting surface theory developed by Tsakonas and his colleagues at Davidson Laboratory, (3) An unsteady lifting surface theory developed by Kerwin and Lee at MIT, and (4) A refinement by Kerwin to the method of Kerwin and Lee to consider the inclination of the propeller slipstream. In inclined flow, all four of the calculation methods evaluated consistently underpredicted the experimental values of the periodic single-blade loads. The method of Kerwin, which considers the inclination of the slipstream relative to the propeller axis, produced the best correlation with experimental values. These correlations show that the inclination of the propeller slipstream relative to the propeller axis significantly influence the periodic signle-blade loads. The importance of this inclination increases with increasing time-average loading.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 220
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Author:
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ISBN:
Category : Propellers
Languages : en
Pages : 532
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Author:
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ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 960
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Book Description
Author: Robert J. Boswell
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 52
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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: British Ship Research Association
Publisher:
ISBN:
Category : Shipbuilding
Languages : en
Pages : 944
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Book Description
Consists largely of abstracts of articles and papers of interest to shipbuilders, ship owners and marine engineers.
Author: R. J. Boswell
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
A variety of procedures for predicting periodic bearing (shaft) loads and single-blade loads on propellers operating in circumferentially nonuniform flow are systematically evaluated. These procedures include the following: 1. a simple quasi-steady procedure that uses the open water characteristics of the propeller; 2. a simple stripwise two-dimensional unsteady procedure; 3. an unsteady lifting line procedure; and 4. four different numerical procedures based on unsteady lifting surface theory. The ranges of applicability and limitations of the evaluated procedures are assessed. The assessments of applicability are based on comparisons with: 1. model experimental periodic bearing loads over systematic ranges of propeller parameter in idealized wake patterns; 2. model experimental single-blade loads in idealized wake patterns; and 3. model experimental single-blade loads simulating the effects of waves and ship motions. Tradeoffs between accuracy of predictions versus ease and simplicity of the computational procedures for practical applications are discussed. The results show that unsteady lifting surface procedures give the best prediction of periodic bearing loads over practical ranges of propeller parameters. However, quasi-steady and empirical methods are adequate for estimating single blade loads for most practical applications.
Author:
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Category : Research
Languages : en
Pages : 942
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Book Description
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
