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Keywords: duct
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Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-098
... ABSTRACT In this study, an optimization method which couples a Reynolds-averaged Navier-Stokes (RANS) method and lifting line model interaction method is presented, and applied to design, for highest power output, horizontal axis marine current turbines in uniform inflow for different duct...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-249
... A Research of the DP Thruster Analysis with Various Duct Shapes for the Model Test Hyung Do Song*, Young-Shik Kim*, Jung-Chun Suh** *Offshore Plant and Marine Energy Research Division, KRISO, Daejeon, Korea **Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-013
... experiment, the result reveals that the design and prediction arrives at the engineering application level. At the same time, the design and prediction method is verified. efficiency correspond mass flow result reveal mixed-flow pump guide vane duct calculation numerical simulation...
Proceedings Papers

Paper presented at the The 28th International Ocean and Polar Engineering Conference, June 10–15, 2018
Paper Number: ISOPE-I-18-291
... Experimental Investigation of Surface Pressure Distribution of the Duct-Type Energy Saving Device for Ships both in Calm Water and in Wave Conditions Kenichi Kume, Ryohei Fukasawa Fluids Engineering & Hull Design Department, National Maritime Research Institute, National Institute of Maritime...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-167
... geometries. self-propulsion condition duct resistance horizontal fin appendage verification esd propeller energy conservation procedure slipstream attack angle thrust resistance force rudder cfd computation marine transportation computation tank test flow field propeller model...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-409
... shaft-driven propeller. It is of great interest that the influence of the special configuration of the rim part and the interaction between the rim and the duct on the local fluid flow field and global forces and moments, as well as the different behavior of the RDT with and without hub and central...
Proceedings Papers

Paper presented at the The 26th International Ocean and Polar Engineering Conference, June 26–July 2, 2016
Paper Number: ISOPE-I-16-322
... Velocimetry (PIV) system. The model ship used in the work is Japan Bulk Carrier (JBC) with/without round shaped small duct equipped at the upstream position of propeller as an energy saving device (ESD). In this paper, measured mean flow field upstream/downstream of rotating propeller with/without duct are...
Proceedings Papers

Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, June 15–20, 2014
Paper Number: ISOPE-I-14-510
... Abstract QCM has been applied to open-water thrust and torque predictions of the ducted propellers with different positions of the propeller and duct. The QCM results are in good agreement with the experimental data of the propellers positioned inside a duct. The results of propellers in the...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-350
... ABSTRACT This research investigates designs for duct type of the energy saving device attached on the stern of a VLCC hull form. The parent design for the duct type is SSD (Super Stream Duct), which originally developed by Hitachi Zosen. The CFD (Computational Fluid Dynamics) simulation...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-632
... materials and systems in an effort to increase the durability of post-tensioned concrete structures. The results of forensic analysis after long-term exposure in the second research project will be described in this paper. duct flowline corrosion strand plastic duct well integrity forensic...
Proceedings Papers

Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, June 30–July 5, 2013
Paper Number: ISOPE-I-13-033
...-directional jets are generated and the energy from the jets are gained by putting turbines in the ducts of the breakwater In this study, the proposed system is introduced at first. Then, the results of numerical simulations to predict the efficiency of newly designed hydropower turbine for the system are...
Proceedings Papers

Paper presented at the The Twenty-second International Offshore and Polar Engineering Conference, June 17–22, 2012
Paper Number: ISOPE-I-12-111
... ABSTRACT The present work aims to find out the applicability of the bulge concept used in the Anaconda (Chaplin et al., 2011) on a possible seabed version. The tested model is a long rectangular duct covered with an elastic membrane and placed on the seabed, parallel to wave propagation. The...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-199
... conditions, a slow acting relief valve exists which can be opened from 0% to 100%, according to the incident sea-state. The safety of the turbo-generation group is provided by redundancy in the closure mechanism of the air duct: a slow-acting guillotine-type isolation valve is shut whenever the plant is non...
Proceedings Papers

Paper presented at the The Twentieth International Offshore and Polar Engineering Conference, June 20–25, 2010
Paper Number: ISOPE-I-10-446
... proportional to the cube of velocity. The upstream duct could accelerate the flow speed causing greater power generation. To investigate the effect of upstream duct to the speed increase, series of experiments have been carried out in CWC (Circulating Water Channel) and the various cases are analyzed using CFD...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-156
... water column in the chamber and bi-directional air flow in the duct installed on the top of the chamber are calculated, and compared with experimental data to verify the validation of the present NWT. The nozzle effects of the chamber-duct system on the relative amplitudes of the inner free water...
Proceedings Papers

Paper presented at the The Eighteenth International Offshore and Polar Engineering Conference, July 6–11, 2008
Paper Number: ISOPE-I-08-448
... power. Principle of MHD power generation is shown in Fig.1. duct conversion efficiency electric current social responsibility efficiency magnetic field wave period liquid metal floater renewable energy spring force variation voltage lmmhd duct ocean energy sustainability stroke...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-397
... propulsion performance numerical simulation experiment thrust deduction resistance computation duct propeller coefficient underwater vehicle self-propulsion factor simulation auv equation thruster efficiency propeller efficiency Resistance and Propulsion Performance of an Underwater...
Proceedings Papers

Paper presented at the The Seventeenth International Offshore and Polar Engineering Conference, July 1–6, 2007
Paper Number: ISOPE-I-07-367
... The motions of floating BBDB(backward-bent duct buoy) wave energy absorbers with an orifice type air-duct located at the middle of the top lid in regular waves are calculated taking account of the oscillating surface-pressure due to the pressure drop in the air chamber above the oscillating...
Proceedings Papers

Paper presented at the The Fifteenth International Offshore and Polar Engineering Conference, June 19–24, 2005
Paper Number: ISOPE-I-05-085
... ABSTRACT The behavior of floating type OWC (Oscillating Water Column) type wave energy device in wave is influenced by the pneumatic reaction forces of the air trapped in the air chamber, and the aerodynamics in the air chamber is determined by viscous damping force occurred in the duct with...
Proceedings Papers

Paper presented at the The Fifteenth International Offshore and Polar Engineering Conference, June 19–24, 2005
Paper Number: ISOPE-I-05-084
... ABSTRACT The mean power as well as the motions and time-mean horizontal drift force of a floating BBDB (backward-bent duct buoy) wave energy absorber in regular waves are calculated within the scope of the linear wave theory. The radiation-diffraction potential problem associated with the OWC...

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