Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller
Partially submerged propellers function in two-phase condition, i.e. each propeller blade enters water once in each revolution so the thrust and torque of each blade hit maximum level and then become around zero. Surface-piercing propeller investigated in this work is a new geometry that the main pu...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Iranian Association of Naval Architecture and Marine Engineering
2020-01-01
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| Series: | International Journal of Maritime Technology |
| Subjects: | |
| Online Access: | http://ijmt.ir/article-1-680-en.html |
| _version_ | 1818413193073000448 |
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| author | Ehsan Yari Ali Barati Moghaddam |
| author_facet | Ehsan Yari Ali Barati Moghaddam |
| author_sort | Ehsan Yari |
| collection | DOAJ |
| description | Partially submerged propellers function in two-phase condition, i.e. each propeller blade enters water once in each revolution so the thrust and torque of each blade hit maximum level and then become around zero. Surface-piercing propeller investigated in this work is a new geometry that the main purpose of its design has been to achieve higher hydrodynamic performance; minimizing energy loss by reducing of the volume fraction of the water adhered to the exiting blade from the water surface. In this article, Reynolds-Averaged Navier–Stokes computations based on finite volume method (FVM) was applied to investigate force excitation, ventilation pattern and wake formation of the partially submerged propeller under inclination angle. Two-phase flow field equations were solved using homogenous Eulerian multiphase model by sliding method. To solve two-phase flow field at the free surface accurately and deal with free surface effects in calculations, CFX free surface model based on volume of fluid (VOF) approach was used. The accuracy of the numerical method was verified using series of simulations on SPP-841B propeller with existing experimental measurements. Comparison between simulated and measured SPP-841B open characteristics as well as ventilation pattern of the key blade indicated a reasonable agreement with experimental data and observations. Based on obtained data, with an increase in shaft inclination angle, propeller thrust and torque coefficients increased, whereas the propeller efficiency was decreased. |
| first_indexed | 2024-12-14T10:59:18Z |
| format | Article |
| id | doaj.art-26751389312e40b19a606ab90c0814bf |
| institution | Directory Open Access Journal |
| issn | 2345-6000 2476-5333 |
| language | English |
| last_indexed | 2024-12-14T10:59:18Z |
| publishDate | 2020-01-01 |
| publisher | Iranian Association of Naval Architecture and Marine Engineering |
| record_format | Article |
| series | International Journal of Maritime Technology |
| spelling | doaj.art-26751389312e40b19a606ab90c0814bf2022-12-21T23:04:47ZengIranian Association of Naval Architecture and Marine EngineeringInternational Journal of Maritime Technology2345-60002476-53332020-01-0113Winter and Spring 20201119Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propellerEhsan Yari0Ali Barati Moghaddam1 Maleke Ashtar University of Technology Maleke Ashtar University of Technology Partially submerged propellers function in two-phase condition, i.e. each propeller blade enters water once in each revolution so the thrust and torque of each blade hit maximum level and then become around zero. Surface-piercing propeller investigated in this work is a new geometry that the main purpose of its design has been to achieve higher hydrodynamic performance; minimizing energy loss by reducing of the volume fraction of the water adhered to the exiting blade from the water surface. In this article, Reynolds-Averaged Navier–Stokes computations based on finite volume method (FVM) was applied to investigate force excitation, ventilation pattern and wake formation of the partially submerged propeller under inclination angle. Two-phase flow field equations were solved using homogenous Eulerian multiphase model by sliding method. To solve two-phase flow field at the free surface accurately and deal with free surface effects in calculations, CFX free surface model based on volume of fluid (VOF) approach was used. The accuracy of the numerical method was verified using series of simulations on SPP-841B propeller with existing experimental measurements. Comparison between simulated and measured SPP-841B open characteristics as well as ventilation pattern of the key blade indicated a reasonable agreement with experimental data and observations. Based on obtained data, with an increase in shaft inclination angle, propeller thrust and torque coefficients increased, whereas the propeller efficiency was decreased.http://ijmt.ir/article-1-680-en.htmlpartially submerged propellerventilation patternwake formationinclination angle |
| spellingShingle | Ehsan Yari Ali Barati Moghaddam Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller International Journal of Maritime Technology partially submerged propeller ventilation pattern wake formation inclination angle |
| title | Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller |
| title_full | Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller |
| title_fullStr | Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller |
| title_full_unstemmed | Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller |
| title_short | Inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller |
| title_sort | inclination angle effect on ventilation pattern and trailing wake formation of the partially submerged propeller |
| topic | partially submerged propeller ventilation pattern wake formation inclination angle |
| url | http://ijmt.ir/article-1-680-en.html |
| work_keys_str_mv | AT ehsanyari inclinationangleeffectonventilationpatternandtrailingwakeformationofthepartiallysubmergedpropeller AT alibaratimoghaddam inclinationangleeffectonventilationpatternandtrailingwakeformationofthepartiallysubmergedpropeller |