Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers
The hydrodynamic effect exerted by a nozzle placed in front of a KP505 propeller on the propulsive performances is studied by using extensive numerical simulations. The influence of a NACA 0015 nozzle with a chord length of 0.3 of the propeller diameter, D, mounted at 0.2 D in front of the propeller...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/9/2/125 |
| _version_ | 1797406813850697728 |
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| author | Adrian Lungu |
| author_facet | Adrian Lungu |
| author_sort | Adrian Lungu |
| collection | DOAJ |
| description | The hydrodynamic effect exerted by a nozzle placed in front of a KP505 propeller on the propulsive performances is studied by using extensive numerical simulations. The influence of a NACA 0015 nozzle with a chord length of 0.3 of the propeller diameter, D, mounted at 0.2 D in front of the propeller plane is studied for a various range of relevant nozzle diameters and different angles of attack. A detached eddy simulation (DES)-based hybrid technique implemented on the ISIS-CFD finite volume solver of the Numeca’s Fine<sup>TM</sup>/Marine environment is proposed to fit the purpose. Systematically conducted simulations have proven that the net thrust reflecting the overall drag, which includes the nozzle, depends on the duct size. The duct presence determines two regions of the inflow into the propeller. One is the inner region of the nozzle where the high-speed flow exists because of the contraction of the duct. The other is the outer region of the nozzle where the flow decelerates due to the duct wake. Lower- and higher-pressure coefficients on the suction and pressure sides, cover a significantly wider area than those of the case without the nozzle, leading therefore to greater thrust and torque. The existence of a critical attack angle for which the magnitude of the relative axial force becomes maximum for the smallest nozzle diameter has been noticed. |
| first_indexed | 2024-03-09T03:31:05Z |
| format | Article |
| id | doaj.art-fe62712136f142239f90eccc5e75e79b |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-09T03:31:05Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-fe62712136f142239f90eccc5e75e79b2023-12-03T14:55:32ZengMDPI AGJournal of Marine Science and Engineering2077-13122021-01-019212510.3390/jmse9020125Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of PropellersAdrian Lungu0Department of Naval Architecture, “Dunarea de Jos” University of Galati, 800008 Galati, RomaniaThe hydrodynamic effect exerted by a nozzle placed in front of a KP505 propeller on the propulsive performances is studied by using extensive numerical simulations. The influence of a NACA 0015 nozzle with a chord length of 0.3 of the propeller diameter, D, mounted at 0.2 D in front of the propeller plane is studied for a various range of relevant nozzle diameters and different angles of attack. A detached eddy simulation (DES)-based hybrid technique implemented on the ISIS-CFD finite volume solver of the Numeca’s Fine<sup>TM</sup>/Marine environment is proposed to fit the purpose. Systematically conducted simulations have proven that the net thrust reflecting the overall drag, which includes the nozzle, depends on the duct size. The duct presence determines two regions of the inflow into the propeller. One is the inner region of the nozzle where the high-speed flow exists because of the contraction of the duct. The other is the outer region of the nozzle where the flow decelerates due to the duct wake. Lower- and higher-pressure coefficients on the suction and pressure sides, cover a significantly wider area than those of the case without the nozzle, leading therefore to greater thrust and torque. The existence of a critical attack angle for which the magnitude of the relative axial force becomes maximum for the smallest nozzle diameter has been noticed.https://www.mdpi.com/2077-1312/9/2/125propeller open waternozzlesperformance coefficientsnumerical simulationrotating framesliding grids |
| spellingShingle | Adrian Lungu Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers Journal of Marine Science and Engineering propeller open water nozzles performance coefficients numerical simulation rotating frame sliding grids |
| title | Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers |
| title_full | Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers |
| title_fullStr | Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers |
| title_full_unstemmed | Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers |
| title_short | Energy-Saving Devices in Ship Propulsion: Effects of Nozzles Placed in Front of Propellers |
| title_sort | energy saving devices in ship propulsion effects of nozzles placed in front of propellers |
| topic | propeller open water nozzles performance coefficients numerical simulation rotating frame sliding grids |
| url | https://www.mdpi.com/2077-1312/9/2/125 |
| work_keys_str_mv | AT adrianlungu energysavingdevicesinshippropulsioneffectsofnozzlesplacedinfrontofpropellers |