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축적된 오염물에 의한 풍력터빈 블레이드 공력 성능 저하에 관한 수치적 연구
김영진,유동옥,권오준 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11
본 연구에서는 비정렬 격자 기반의 유동해석 코드를 이용하여 NREL 5MW 풍력터빈 블레이드의 공력 해석을 수행하였으며, 블레이드 앞전에 축적된 오염물에 의해 발생하는 공력 성능 저하를 조사하였다. 오염물이 증착될 경우, 앞전 부근에서 유동 박리 현상이 발생하며, 이는 풍력터빈의 공력 성능 저하를 유발함을 확인하였다. 증착되는 오염물의 크기가 증가할수록 공력성능의 저하는 크게 나타나며, 풍력터빈이 날개 끝 속도비가 큰 낮은 풍속에서 운용될 때 공력성능이 저하됨을 확인하였다. In the present study, aerodynamic analyses of the NREL 5MW reference wind turbine blades were conducted by using an unstructured mesh flow solver, and the aerodynamic performance loss due to accumulated contaminant along the blade leading edge was investigated. It was found that due to the contaminant, flow separations occur near the leading edge, which results in a reduced aerodynamic performance. This effect is further magnified as the contaminant size becomes larger. It was also found that the performance loss is particularly significant when the turbine operates at low wind speeds where the tip speed ratio is relatively large.
최원(Won Choi) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.12
깃끝단 후퇴각을 가지는 최신 터보프롭 항공기의 프로펠러 블레이드에 대한 공력설계 및 해석을 수행하였다. 프로펠러 형상 설계를 위한 익형은 HS1 계열을 적용하였다. 와류-깃요소 이론(Vortex-Blade element theory)을 기반으로 하고 최소에너지 손실 조건을 만족하는 Adkins의 방법을 적용하여 Conventional 프로펠러 블레이드에 대한 공력설계 및 성능해석을 하였다. 목표 항공기의 설계점에서 코드 길이와 피치각을 변경해 가며 프로펠러 형상을 생성하였다. Conventional 프로펠러 블레이드 형상 정보를 기반으로 코드 길이, 깃끝단 후퇴각을 수정 적용하여 최신 프로펠러를 설계하였다. 전산유체역학을 이용한 설계된 최신 프로펠러 공력특성 분석을 통하여 최신 프로펠러가 적절하게 설계되었음을 확인하였다. The aerodynamic design and analysis on advanced propeller with blade sweep was performed for recent turboprop aircraft. HS1 airfoil series are selected as a advanced propeller blade airfoil. Adkins method is used for aerodynamic design and performance analysis with respect to the design point. Adkins method is based on the vortex-blade element theory which design the propeller to satisfy the condition for minimum energy loss. Propeller geometry is generated by varying chord length and pitch angle at design point of target aircraft. Advanced propeller is designed by apply the modified chord length, the tip sweep which is based on the geometry of conventional propeller. The aerodynamic characteristics of the designed Advanced propeller were verified by CFD(Computational Fluid Dynamic) and evaluated to be properly designed.
이중 다류관 모델을 적용한 수직축 풍력발전기 공력해석코드 개발 및 검증
이혜빈,써니 쿠마르 포구루리,배윤혁 한국풍력에너지학회 2020 풍력에너지저널 Vol.11 No.3
This research developed an aerodynamic analysis code for a vertical-axis wind turbine (VAWT) based on the structure of AeroDyn ver. 15, developed by the NREL. The aerodynamic analysis code used the double multiple streamtube model (DMSM) to describe aerodynamic characteristics, anticipating more accurate results and faster computation time. Tip-loss correction was adopted to increase the accuracy of the results. Validation was carried out by comparing the results from the developed code to the experimental and CFD analysis results. For the validation of aerodynamic characteristics computed by the developed code, power coefficient curves and rotor torque curves were chosen. The power coefficient curve predicted by the developed code showed good agreement with the experimental and CFD results. In the case of rotor torque, the developed code gave reasonable results compared to the CFD results. The differences in rotor torque were due to the secondary effects of the VAWT aerodynamics. Consequently, it was found that the developed aerodynamic analysis code can be used for the preliminary design of the VAWT, which requires fast and reasonable prediction.
BEMT를 이용한 5 kW급 수평축 풍력발전용 로터 블레이드 형상 최적설계에 관한 연구
김문오(Kim, Mun-Oh),이민우(Lee, Min-Woo),김창구(Kim, Chang-Goo),김태형(Kim, Tae-Hyung),이영호(Lee, Young-Ho) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The aerodynamic characteristics of NACA 63415 airfoils were predicted via X-FOIL and the post stall characteristics were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the Velux wind tunnel test results. The rated power of the testing rotor is 5kW at design conditions. The power, estimated by use of predicted lift and drag coefficient via X-FOIL becomes a little higher than experimental one.