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100 kW급 조류발전용 듀얼 수직축 터빈의 성능특성 연구
허만웅,김동환,박진순 한국수소및신에너지학회 2020 한국수소 및 신에너지학회논문집 Vol.31 No.1
This study aimed to investigate the performance characteristics of vertical axis turbine of tidal energy convertor. Three-dimensional Reynolds-averaged Navier-Stokes equation with shear stress transport turbulence model has been solved to analyze the fluid flow of the vertical axis turbine. The hexahedral grids have been used to construct the computational domain and the grid dependency test has been performed to find the optimum grid system. Four steps have been carried out to design the vertical axis turbine of the 100kW class tidal energy convertor.
수평축 조류발전 터빈의 노즈 형상 및 유입각도, 타워 구조물의 영향을 고려한 터빈 성능특성 분석
허만웅,김동환,이진학 한국해안,해양공학회 2020 한국해안해양공학회 논문집 Vol.32 No.1
본 연구에서는 1MW급 수평축 조류발전기의 출력 및 유동특성을 분석하기 위해 3차원 레이놀즈 평균 나비어-스톡스 해석을 수행하였다. 난류해석을 위해 SST(shear stress transport) 난류모델을 사용하였고, 유동해석을 위한 계산영역은 육면체격자로 구성하였으며, 최적의 격자 크기를 결정하기 위하여 격자 의존성 시험을 수행하였다. 터빈의 노즈 형상 및 유입각도, 그리고 타워 구조물의 영향을 분석하였다. 노즈 형상의 경우 노즈의 직경 대비 축방향 길이의 비가 증가할수록 터빈 출력이 향상되는 결과를 확인할 수 있었고, 유입각도가 약 15 o 이상에서는 터빈의성능이 약 10% 이상 감소하는 것을 확인하였다. 또한 타워 구조물에 의하여 하류식 터빈의 경우 상류식 터빈에 비하여 성능이 1% 감소함을 알 수 있었다. In this study, three-dimensional fluid flow analyses have been performed in order to investigate the performance characteristics of a horizontal axis tidal turbine (HATT) by solving three-dimensional Reynolds-averaged Navier-Stokes equations utilizing the shear-stress-transport turbulence model. The computational domain for the flow analysis has been composed of hexahedral grids, and the grid dependency test has been carried out so as to determine the optimum grid size. Performance characteristics of the HATT have been investigated in consideration of the effects of hub nose geometry, inflow angle, and the tower. It has been found that the power output can be enhanced along with an increase of the ratio of the length to the diameter of the turbine nose, and the power of HATT has been reduced by approximately 10% when the primary fluid flow had an inflow angle of 15o. The power output of downstream HATT is found to be lower than that of the upstream HATT by about 1%.
울돌목 해양환경을 고려한 1MW급 조류발전시스템 설계근거 및 통합하중해석
허만웅(Man-Woong Heo),김동환(Dong-Hwan Kim),고동휘(Dong-Hui Ko),이진학(Jin-Hak Yi) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
본 연구에서는 전라남도 진도군에 위치한 울돌목(명량수도)에 설치 예정인 1MW급 조류발전시스템에 대한 설계근거 및 통합하중해석을 수행하였다. 울돌목의 해양환경 조사자료와 IEC TS 626000 문서를 참조하여 설계근거를 작성하였으며, BEMT(Blade Element Momentum Theory)를 기반으로 최적의 터빈 블레이드 형상을 설계하고, 기초 성능을 평가하였다. 기초 설계된 블레이드 형상 및 허브-나셀 형상을 이용하여 삼차원 레이놀즈 평균 나비어-스톡스 해석을 수행하여 유동장을 분석하였고, 또한 Tidal Bladed를 사용하여 다양한 설계조건에서의 통합하중해석을 수행하여 출력성능 및 설계하중을 평가하였다. 이러한 결과를 바탕으로 울돌목 해양환경에서의 1MW급 조류발전시스템에 대한 유동 및 하중특성을 종합적으로 분석하였다. In this study, preliminary design has been carried out for a 1MW class tidal current convertor system that is being designed to be installed in Uldolmok Strait located in Jindo-gun, Jeollanam-do. Marine environmental conditions of Uldolmok Strait has been investigated and the design basis has been determined. Optimal blade shape has been designed and performance has been evaluated based on BEMT(Blade Element Momentum Theory). Also, flow characteristics has been analyzed by carrying out a three-dimensional Reynolds averaged Navier-Stokes analysis on the optimally designed blade shape, an integrated load analysis has been performed by using Tidal Bladed. Consequentially, the flow characteristics and load performances of the tidal current turbine system in the Uldolmok Strait have been comprehensively analyzed.
허만웅(M.W. Heo),이기돈(K.D. Lee),김광용(K.Y. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
In the present work, a numerical study of fluid flow and heat transfer on the concave surface with impinging jet has been performed by solving three-dimensional Reynods-averaged Naver-Stokes(RANS) equations. The constant temperature condition was applied to the concave impingement surface. The inclination angle of jet nozzle and the distance between jet nozzles are chosen as design variables under equivalent mass flow rate of working fluid into cooling channel, and area averaged Nusselt number on concave impingement surface is set as the objective function. Thirteen training points are obtained by Latin Hypercube sampling method, and the PBA model is constructed by using the objective function values at the trainging points. And, the sequential quadratic programming is used to search for the optimal point from the PBA model. Through the optimization, the optimal shape shows improved heat transfer rate as compared to the reference geometry.
엇갈리게 기울어진 충돌제트들에 의한 오목면 상의 열전달 성능해석
허만웅(M.W. Heo),이기돈(K.D. Lee),김광용(K.Y. Kim) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.2
Numerical analyses have been carried out to analyze the three-dimensional turbulent heat transfer by impingement jet on a concave surface with variation of geometric configurations. Three-dimensional Reynolds averaged Navier-stokes equations have been calculated using the shear stress transport turbulent model. The numerical results for heat transfer rate were validated in comparison with the experimental data. The distance between jet nozzles and angle of inclined jet nozzle were selected as the geometric variables. Area-averaged Nusselt numbers on concave surface are evaluated to find the characteristics of heat transfer with the two geometric variables. The heat transfer increases as the distance between jet nozzles increases, and the inclined impinging jets show much better heat transfer performance than the vertical impinging jet.