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Featured researches published by Yu-Ho Rho.


Journal of Ocean Engineering and Technology | 2012

Design and Performance Test of Savonius Tidal Current Turbine with CWC

Chul-Hee Jo; Jun-Ho Lee; Yu-Ho Rho; Kang-Hee Lee

*Inha University, Incheon, Korea**Hyundai Engineering and Construction, Yongin, KoreaKEY WORDS: TCP (Tidal current power) 조류발전, Renewable energy 신재생 에너지, VAT (Vertical axis turbine) 수직축 터빈, CWC (Circulating water channel) 회류수조, Savonius turbine 사보니우스 터빈, CFD (Computational fluid dynamics) 전산유체역학ABSTRACT: Due to global warming, the need to secure alternative resources has become more important nationally. Because of the very stro ng current on the west coast, with a tidal range of up to 10 m, th ere are many suitable sites for the application of TCP (tidal c urrent power) in Korea. In the southwest region, a strong current is created in the narrow channels between the numerous islands. A rotor is an essential com-ponent that can convert tidal cu rrent energy into rotational energy to generate electricity. The design optimization of a roto r is very important to maximize the power production. The performance of a rotor can b e determined using various parameters, including the number of blades, shape, sectional size, diameter, etc. There are many offshore jetties and piers with high current velocities. Thus, a VAT (vertical a xis turbine) system, which can generate power regardless of flow direction changes, could be effectively applied to cylindrical structures. A VAT system could give an advan-tage to a caisson-type breakwater because it allows water to ci rculate well. This paper introduces a multi-layer vertical axis tidal current power system. A Savonius turbine was designed, and a performance anal ysis was carried out using CFD. A physical model was also demon strated in CWC, and the results are compared with CFD.교신저자 이강희: 인천광역시 남구 용현4동, 032-860-8849, [email protected]


ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering | 2015

Performance and Mooring Analysis of 10 KW Floating Duct-Type Tidal Current Power System

Chul-Hee Jo; Yu-Ho Rho; Chan-Hoe Goo; Do-Youb Kim

Recently, focus has been placed on ocean energy resources because environmental concerns regarding the exploitation of hydrocarbons are increasing. Among the various ocean energy sources, tidal current power (TCP) is recognized as the most promising energy source in terms of predictability and reliability. The enormous energy potential in TCP fields has been exploited by installing TCP systems. The flow speed is the most important factor for power estimation of a tidal current power system. The kinetic energy of the flow is proportional to the cube of the flow’s velocity, and velocity is a critical variable in the performance of the system. Since the duct can accelerate the flow speed, its use could expand the applicable areas of tidal devices to relatively low velocity sites. The inclined angle of the duct and the shapes of inlet and outlet affect the acceleration rates of the flow inside the duct. To investigate the effects of parameters that increase the flow speed, a series of simulations are performed using the commercial computational fluid dynamics (CFD) code ANSYS-CFX. Experimental investigations were conducted using a circulation water channel (CWC). Also, mooring system concepts are investigated using the commercial mooring analysis software WADAM and OrcaFlex. Due to other floating structures operating within a limited area, station-keeping is needed in order to keep the motions of the floating duct structures within permissible limits. In this study, methods for optimizing the mooring system of a floating duct-type tidal current power system in shallow water are investigated. Based on the performance and mooring analysis results of the 10 kW floating duct-type TCP system, a new design for a small capacity floating TCP system is introduced.Copyright


Journal of the Korean Society of Marine Engineering | 2014

A comparison of coupled and uncoupled dynamic analysis for the flexible riser in shallow water

Chul-Hee Jo; Do-Youb Kim; Su-Jin Hwang; Yu-Ho Rho

Flexible risers have been used extensively in recent years for floating and early production systems. Such risers offer the advantage of having inherent heave compliance in their catenary thereby greatly reducing the complexity of the riser-to-rig and riser-to subsea interfaces. Another advantage with flexible risers is their greater reliability. Concerns about fatigue life, gas permeation and pigging of lines have been overcome by extensive experience with these risers in production applications. In this paper, flexible riser analysis results were compared through coupled and uncoupled dynamic analyses methods. A time domain coupled analysis capability has been developed to model the dynamic responses of an integrated floating system incorporating the interactions between vessel, moorings and risers in a marine environment. For this study, SPM (Single Point Mooring) system for an FSU in shallow water was considered. This optimization model was integrated with a time-domain global motion analysis to assess both stability and design constraints of the flexible riser system


ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering | 2014

OPTIMIZATION OF MOORING SYSTEM FOR MULTI-ARRAYED TIDAL TURBINES IN A STRONG CURRENT AREA

Yu-Ho Rho; Chul-Hee Jo; Do-Youb Kim

Recently, focus has been placed on ocean energy resources as environmental concerns regarding the exploitation of hydrocarbons are increasing. The enormous energy potential in tidal current power fields has been exploited by installing floating tidal current power turbines. Due to other floating structures operating within a limited area, stationkeeping is needed in order to keep the motions of the floating structures within permissible limits. In this study, methods for selecting and optimizing the mooring system for floating tidal current power systems in shallow water are investigated. The mooring system provides restoring forces and moments on a floating structure, pulling the structure back toward its equilibrium position. Typically, the mooring lines are segmented in order to optimize the force and displacement characteristics known as the mooring line characteristics. The mooring system concepts investigated in this study include the distributed mass, clump weight, and buoyancy element mooring systems.© 2014 ASME


ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering | 2013

Numerical Analysis of Offshore Pile Structure for Tidal Current Devise Using FSI Method

Chul-Hee Jo; Kang-Hee Lee; Yu-Ho Rho; Do-Youb Kim

Recently, large scale tidal devices have been deployed with a maximum rotor diameter of 20m. These devices impose significant loading on supporting structures. The supporting structure for tidal current power device is under dynamic loadings caused by environmental loadings. Not only the environmental loadings but also the rotating turbine creates dynamic loading as well. The rotating turbine is obviously and continuously deformed for various incoming flow velocities. In many cases, a pile fixed foundation is used to secure the structure. In this study, the commonly used pile fixed type is applied with three blade turbine. A numerical analysis of the hydro-forces from a rotating tidal current turbine to a tower was conducted to determine the deformation distribution along the pile tower. The FSI analysis technique is used in the study.Copyright


Journal of Fluid Machinery | 2010

Interference Effects on the Performance of Multi-arrayed HAT TCP Devices

Chul-Hee Jo; Kang-Hee Lee; Jin-Young Yim; Yu-Ho Rho

Tidal current power system is the energy converter which converts the kinetic energy of tidal stream into electric energy. The performance of the rotor which initially converts the energy is determined by various design factors and it should be optimized by the ocean environment of the field. Flow direction changes due to rise and fall of the tides, but horizontal axis turbine is very sensitive to direction of flow. To investigate the rotor performance considering the interaction problems with incidence angle of flow, series of experiments have been conducted. The results and findings are summarized in the paper.


ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering | 2010

Active Vanning Device and Maintenance System for Horizontal Axis Tidal Current Turbine

Chul-Hee Jo; Kang-Hee Lee; Yu-Ho Rho

The application of TCP (Tidal Current Power) on the west and south coastal regions in Korea seems to be very suitable. There are many potential sites with high current speed up to 6.5m/s. Not like other renewable energy sources, TCP is very reliable and predictable and continuous energy as the tidal current pattern can be predicted throughout the year. One of the essential components in TCP device is the rotor that can convert the inflow current into the rotational energy. The design and optimization of rotor are very important to maximize the power production. The performance of rotor can be determined by various parameters including number of blades, shape, sectional size, hub, diameters and etc. The attack angle also affect significantly on the efficiency of the system. It is very important to maintain the 90 degree of attack angle to the rotor. In Korea, there are distinguishable flow direction changes from high and low tides. To cope with this environmental, a new device so called “Active vanning HAT (horizontal axis turbine) system” is introduced to accommodate the change of incoming flow direction. The experiment results and the performances of the device are introduced in the paper.Copyright


Renewable Energy | 2014

Performance analysis of a HAT tidal current turbine and wake flow characteristics

Chul-Hee Jo; Jun-Ho Lee; Yu-Ho Rho; Kang-Hee Lee


Renewable Energy | 2013

FSI analysis of deformation along offshore pile structure for tidal current power

Chul-Hee Jo; Do-Youb Kim; Yu-Ho Rho; Kang-Hee Lee; Cameron Johnstone


Journal of the Korean society for New and Renewable Energy | 2011

Design of Horizontal Axis Tidal Current Power Turbine with Wake Analysis

Chul-Hee Jo; Do-Youb Kim; Kang-Hee Lee; Yu-Ho Rho; Kook-Hyun Kim

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Kookhyun Kim

Pusan National University

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