Author: Okitsugu Furuya
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
Book Description
The original objective of the present work was to develop an analytical tool for predicting the off-design performance of supercavitating propellers over a wide range of operating conditions. Due to the complex nature of the flow phenomena, a lifting line theory simply combined with the two-dimensional supercavitating cascade theory was selected. Results of this simple method provided surprisingly accurate predictions for the performance at fully developed cavitating conditions. It was indicative that the fully-developed, supercavitating propellers had strong cascade effects on their performance, and also that the three-dimensional, propeller geometry corrections could properly be made by the lifting-line theory. As was expected, however, the predicted thrust and power coefficient curves with this propeller theory showed a significant deviation from experimental data in the range of advance speeds J's larger than designed advance speeds where the partially cavitating conditions are expected to occur. effort was then made to improve the prediction capability of the above propeller theory at partially cavitating conditions. A new nonlinear partially cavitating cascade theory was developed to provide a proper 2-D loading basis under such conditions. A slight improvement on the prediction capability of the propeller theory was achieved with the new set of data, but not to a satisfactory extent.
An Experimental and Theoretical Study on Cavitating Propellers
Author: Okitsugu Furuya
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
Book Description
The original objective of the present work was to develop an analytical tool for predicting the off-design performance of supercavitating propellers over a wide range of operating conditions. Due to the complex nature of the flow phenomena, a lifting line theory simply combined with the two-dimensional supercavitating cascade theory was selected. Results of this simple method provided surprisingly accurate predictions for the performance at fully developed cavitating conditions. It was indicative that the fully-developed, supercavitating propellers had strong cascade effects on their performance, and also that the three-dimensional, propeller geometry corrections could properly be made by the lifting-line theory. As was expected, however, the predicted thrust and power coefficient curves with this propeller theory showed a significant deviation from experimental data in the range of advance speeds J's larger than designed advance speeds where the partially cavitating conditions are expected to occur. effort was then made to improve the prediction capability of the above propeller theory at partially cavitating conditions. A new nonlinear partially cavitating cascade theory was developed to provide a proper 2-D loading basis under such conditions. A slight improvement on the prediction capability of the propeller theory was achieved with the new set of data, but not to a satisfactory extent.
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
Book Description
The original objective of the present work was to develop an analytical tool for predicting the off-design performance of supercavitating propellers over a wide range of operating conditions. Due to the complex nature of the flow phenomena, a lifting line theory simply combined with the two-dimensional supercavitating cascade theory was selected. Results of this simple method provided surprisingly accurate predictions for the performance at fully developed cavitating conditions. It was indicative that the fully-developed, supercavitating propellers had strong cascade effects on their performance, and also that the three-dimensional, propeller geometry corrections could properly be made by the lifting-line theory. As was expected, however, the predicted thrust and power coefficient curves with this propeller theory showed a significant deviation from experimental data in the range of advance speeds J's larger than designed advance speeds where the partially cavitating conditions are expected to occur. effort was then made to improve the prediction capability of the above propeller theory at partially cavitating conditions. A new nonlinear partially cavitating cascade theory was developed to provide a proper 2-D loading basis under such conditions. A slight improvement on the prediction capability of the propeller theory was achieved with the new set of data, but not to a satisfactory extent.
Theoretical and Experimental Propeller-induced Hull Pressures Arising from Intermittent Blade Cavitation Loading and Thickness
Author: John P. Breslin
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 83
Book Description
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 83
Book Description
Report
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 260
Book Description
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 260
Book Description
Report - Naval Ship Research and Development Center
Author: David W. Taylor Naval Ship Research and Development Center
Publisher:
ISBN:
Category : Shipbuilding
Languages : en
Pages : 86
Book Description
Publisher:
ISBN:
Category : Shipbuilding
Languages : en
Pages : 86
Book Description
Supercavitating Propellers-design Theory and Experimental Evaluation
Author: Bohyun Yim (Larimer, G, Peck, J, David W. Taylor Naval Ship Research)
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Static Stresses on Wide-bladed Propellers
Author: Justin H. McCarthy
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 52
Book Description
Static stresses were obtained in laboratory experiments for a destroyer propeller, having aerofoil blade sections, and a super-cavitating propeller, having wedge-shaped blade sections, using specially constructed pressure chambers that allowed the blade faces to be loaded under air pressure. A new method for applying beam theory is presented that closely predicts the magnitude and distribution of radial stresses on the destroyer propeller blade. For the supercavitating propeller, neither the proposed beam-theory method nor a particular computerized-shell analysis can be considered entirely satisfactory for prediction of blade stresses. (Author).
Publisher:
ISBN:
Category : Propellers
Languages : en
Pages : 52
Book Description
Static stresses were obtained in laboratory experiments for a destroyer propeller, having aerofoil blade sections, and a super-cavitating propeller, having wedge-shaped blade sections, using specially constructed pressure chambers that allowed the blade faces to be loaded under air pressure. A new method for applying beam theory is presented that closely predicts the magnitude and distribution of radial stresses on the destroyer propeller blade. For the supercavitating propeller, neither the proposed beam-theory method nor a particular computerized-shell analysis can be considered entirely satisfactory for prediction of blade stresses. (Author).
NBS Special Publication
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 248
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 248
Book Description
Transport Phenomena in Rotating Machinery
Author: J. H. Kim
Publisher: CRC Press
ISBN: 9781560320135
Category : Science
Languages : en
Pages : 572
Book Description
Completing the authoritative coverage begun in Dynamics of Rotating Machinery, this text offers 36 current chapters focusing on the areas of fluid flow, heat transfer, multiple flow, cavitation and design.
Publisher: CRC Press
ISBN: 9781560320135
Category : Science
Languages : en
Pages : 572
Book Description
Completing the authoritative coverage begun in Dynamics of Rotating Machinery, this text offers 36 current chapters focusing on the areas of fluid flow, heat transfer, multiple flow, cavitation and design.
Technical Abstract Bulletin
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 908
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 908
Book Description
Theoretical and Experimental Propeller-induced Hull Pressures Arising from Intermittent Blade Cavitation Loading and Thickness
Author: John P. Breslin
Publisher:
ISBN:
Category : Cavitation
Languages : en
Pages : 244
Book Description
Publisher:
ISBN:
Category : Cavitation
Languages : en
Pages : 244
Book Description