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블레이드 팁 에어포일의 전연 부 손상이 풍력터빈의 연간발전량에 미치는 영향

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Alternative Title
Effect of Damages at the Leading Edge of Blade Tip Airfoils on the Annual Energy Production of Wind Turbines
Abstract
Blade damages such as contamination, erosion and icing are emerging as the
major problem in these days. These phenomenons occur mainly at the blades
tips which are exposed to wind with high angular velocity and it is evitable for
wind turbine to prevent power loss without efficient planning of O&M
(Operating and Maintenance). Therefore, systematic planning of O&M must be
established by collecting the pertinent quantitative data for blade damages.
This study analyzed the effect of damages at the leading edge of blade tip
airfoil(NACA64618) on the aerodynamic performance through transient CFD
simulation and AEP calculation was performed for NREL 5MW reference wind
turbine to obtain the corresponding AEP loss. The CFD simulation result present
ed different aerodynamic deterioration depending on the severity of damage
conditions. The more severer the blade surface damages, the more aerodynamic
performance was deteriorated. For the blade with various damage conditions at
the leading edge of the airfoil, The range of lift coefficient reduction is from 1%
to 53%, and the range of drag coefficient increase is from 34% to 314%, compar
ed with those of a clean airfoil.
The maximum rate of AEP loss under contamination conditions is 7.0% and
that under erosion conditions is 6.8% and that under icing condition is 2%.
The trend of AEP loss corresponded with reduction of lift-drag ratio at the
lower-than-rated wind speed conditions. However, such a trend was not seen at
the higher-than-rated wind speed conditions due to the pitch control system of
the wind turbine. Overall, the calculated AEP loss ranged from 2% to 7.0%
depending on the extent of damage at the leading edge.
Author(s)
한우범
Issued Date
2017
Awarded Date
2017. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000007931
Alternative Author(s)
WooBeom Han
Affiliation
제주대학교 일반대학원
Department
대학원 풍력공학부 풍력기계시스템전공
Advisor
김범석
Table Of Contents
Abstract 1
I. 서 론 2
1.1 연구배경 2
1.2 연구목적 4
II. 에어포일의 공기역학적 특성 및 결빙 이론 6
2.1 유동박리에 의한 실속현상 6
2.2 Reynolds 수와 항력계수의 상관관계 7
2.3 결빙 성장률(rate of ice growth) 9
2.4 Collection efficiency의 특징 10
III. 시뮬레이션 모델 및 블레이드 손상상태 정의 12
3.1. 시뮬레이션 모델 선정 12
3.1.1 에어포일 모델 선정 12
3.1.2 풍력터빈 모델 선정 13
3.2 블레이드 손상상태 정의 14
3.2.1 블레이드 오염현상(Contamination) 14
3.2.2 블레이드 마모현상(Erosion) 15
3.2.3 블레이드 결빙현상(Icing) 16
Ⅳ. 팁 에어포일 전연 부 손상상태에 따른 공력성능 분석 20
4.1. 수치해석 조건 선정 20
4.1.1 난류모델 선정 20
4.1.2 격자 21
4.1.3 경계조건 24
4.1.4 결빙 해석기법 검증 24
4.1.5 ESGR(Equivalent Sand Grain Roughness) 27
4.2 CFD 결과 및 고찰 30
4.2.1 오염 및 마모조건 공력성능 분석 30
4.2.2 착빙(Ice accretion) 33
4.2.3 결빙조건 공력성능 분석 39
IV. 블레이드 손상상태에 따른 AEP 감소율 42
1. AEP 산출 조건 42
2. AEP 감소율 분석 43
V. 결론 46
참고문헌 47
Degree
Master
Publisher
제주대학교 일반대학원
Citation
한우범. (2017). 블레이드 팁 에어포일의 전연 부 손상이 풍력터빈의 연간발전량에 미치는 영향
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Faculty of Wind Energy Engineering > Wind Power Mechanical System Engineering
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