• 제목/요약/키워드: 사보니우스 터빈

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사보니우스 풍력 터빈의 효율 향상을 위한 연구 (A Study for Improving the Performance of Savonius Wind Turbine)

  • 홍철현
    • Journal of Advanced Marine Engineering and Technology
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    • 제35권2호
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    • pp.258-263
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    • 2011
  • 본 연구는 국내 풍향 조건에 적합한 사보니우스 풍력 터빈의 개발과 효율향상을 위한 기초설계 자료를 얻고자 한다. 이를 위해 1/4 윈드실드가 부착된 풍력 터빈 주변의 유동장 특성을 수치해석으로 확인하였고, 터빈 로터의 회전수를 수치해석과 실험을 통하여 측정하였다. 측정결과 수치해석결과와 실험결과의 경향이 일치하였고, 윈드실드가 부착된 경우의 회전수가 약 70% 이상 향상됨을 확인하였다.

사보니우스 풍력발전기의 유동소음특성에 관한 수치적 연구 (Numerical Analysis on the Flow Noise Characteristics of Savonius Wind Turbines)

  • 김상현;정철웅
    • 한국소음진동공학회논문집
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    • 제23권6호
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    • pp.502-511
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    • 2013
  • Noise performance of small wind turbines is critical since these are generally installed near the community. In this study, flow noise characteristics of Savonius wind turbines are numerically investigated. Flow field around the turbine are computed by solving unsteady RANS equation using CFD techniques and the radiated noise are predicted by applying acoustic analogy to the computed flow data. Parametric study is then carried out to investigate the effects of operating conditions and geometric design factors of the Savonius wind turbine. Tonal noise components with higher harmonic frequency than the BPF are identified in the predicted noise spectra from a Savonius wind turbine. The end-plates and helical blades are shown to reduce overall noise levels. These results can be used to design low-noise Savonius wind turbines.

와류이탈 위상차를 이용한 사보니우스형 풍력터빈의 소음 저감 설계에 관한 수치적 연구 (Numerical Analysis on the Low Noise Designs of Savonius Wind Turbines by Inducing Phase Difference in Vortex Shedding)

  • 김상현;정철웅
    • 대한기계학회논문집A
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    • 제38권3호
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    • pp.269-274
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    • 2014
  • 본 논문에서는 사보니우스형 풍력터빈의 저소음 설계에 관한 연구를 수행하였다. 선행연구를 통해 BPF 보다 높은 주파수를 기본주파수로 가지며 발생하는 하모닉 성분의 순음소음이 사보니우스형 풍력터빈의 주요한 소음임을 밝혔고, 이러한 하모닉 성분의 소음은 와류에 의한 것임을 확인하였다. 본 연구에서는 이러한 선행연구결과를 바탕으로, 사보니우스형 풍력터빈의 저소음 설계를 위해 이탈되는 와류에 위상차를 유도할 수 있는 터빈 날개 끝단을 도입하였다. CFD 기법 및 음향상사법을 적용한 복합 전산공력음향학 기법을 적용하여 제안한 저소음 사보니우스형 풍력터빈의 방사 소음을 수치적으로 예측하였고, 기존의 형상과 비교를 통해 소음 저감 효과를 확인하였다.

사보니우스 소형풍력터빈 수치해석용 격자시스템 평가 (Evaluation of a Grid System for Numerical Analysis of a Small Savonius Wind Turbine)

  • 김철규;이상문;전석윤;윤준용;장춘만
    • 한국수소및신에너지학회논문집
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    • 제27권5호
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    • pp.547-553
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    • 2016
  • This paper presents the effect of a grid system on the performance of a small Savonius wind turbine installed side-by-side. Turbine performance is compared using three different grid systems; tetrahedral grid having a concentrated circular grid around turbine rotors, the tetrahedral grid having a concentrated rectangular grid around turbine rotors and the symmetric grid having a concentrated tetrahedral grid near the turbine rotor blades and a hexahedral grid. The commercial code, SC/Tetra has been used to solve the three-dimensional unsteady Reynolds-averaged Navier-Stokes analysis in the present study. The Savonius turbine rotor has a rotational diameter of 0.226m and an aspect ratio of 1.0. The distance between neighboring rotor tips keeps the same length of the rotor diameter. The variations of pressure and power coefficient are compared with respect to blade rotational angles and rotating frequencies of the turbine blade. Throughout the comparisons of three grid systems, it is noted that the symmetric grid having a concentrated tetrahedral grid near the turbine rotor blades and a hexahedral grid has a stable performance compared to the other ones.

와류이탈 위상차를 이용한 사보니우스형 풍력터빈의 소음 저감 설계에 관한 수치적 연구 (Numerical analysis on the low noise designs of Savonius wind turbines by using phase difference in vortex shedding)

  • 김상현;정철웅
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2013년도 춘계학술대회 논문집
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    • pp.166-171
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    • 2013
  • In this study, low noise designs of a Savonius wind turbines are numerically investigated. From a previous study, it was found that the high harmonic components whose fundamental frequency is higher than the BPF were found to be dominant in noise spectrum of a Savonius wind turbine. On a basis of this observation, S-shaped blade tip is proposed as a low design factors that decrease wind turbine noise by inducing phase differences in vortex shedding. The conventional Savonius and S-shaped turbines are investigated using Hybrid CAA method where flow field around the turbine are computed using CFD techniques and the radiated noise are predicted by applying acoustic analogy to the computed flow data. Noise reductions by these design factors are confirmed by comparing the predicted noise levels from these turbines.

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항력식 조류발전 터빈의 최적 형상 설계 및 유동 수치해석을 통한 성능 평가 (Design and Performance Evaluation of the Savonius Tidal Current Turbine)

  • 조철희;고광오;이준호;이강희
    • 신재생에너지
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    • 제8권2호
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    • pp.6-13
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    • 2012
  • Due to global warming, the need to secure an alternative resource has become more important nationally. Having very strong current on the west coast with up to 10 m tidal range, there are many suitable site for the application of TCP (Tidal Current Power) in Korea. On the south west regions between many islands that create strong current in the narrow channels. The rotor is one of the essential components which can convert tidal current energy into rotational energy to generate electricity. The design optimization of rotor is very important to maximize the power production. The performance of rotor can be determined by various parameters including number of blades, shape, sectional size, diameters and etc. This paper introduces the multi-layer vertical axis tidal current power system which can be applied to offshore jetties and piers effectively. Various cases of VAT turbine were designed. Specifically, the number of blades and turbine shape are changed in several cases. Also, performance analysis was carried out by CFD.

CFD를 이용한 수직축 터빈 설계 및 유동특성 분석 (Vertical Axis Tidal Turbine Design and CFD hydrodynamic Analysis)

  • 조철희;고광오;이준호;노유호;이강희
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2011년도 추계학술대회 초록집
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    • pp.159.1-159.1
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    • 2011
  • Due to the global warming, the need to secure the alternative resources has become more important worldwide. Having very strong current on the west coast with up to 10 m tidal range, there are many suitable sites for the application of TCP(Tidal current power) in Korea. Not only from the current produced from the high tidal range, but also it can be widely applied to the offshore jetties and piers. The VAT(Vertical axis turbine) system could be very effective tidal device to extract the energies from the attacking flow to the structures. For the relatively slow current speed, the VAT system could be more effective application than HAT(Horizontal axis turbine) device. The performance of VAT can be evaluated by various parameters including number of blades, shape, sectional size, diameters and etc. The paper introduces the multi-layer vertical axis tidal current power system with savonius turbine. The turbine was designed with consideration of optimal blade numbers and the performance was simulated by CFD analysis.

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사보니우스형 조류발전 터빈의 설계 및 회류수조 실험을 통한 성능평가 (Design and Performance Test of Savonius Tidal Current Turbine with CWC)

  • 조철희;이준호;노유호;고광오;이강희
    • 한국해양공학회지
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    • 제26권4호
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    • pp.37-41
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    • 2012
  • Due to global warming, the need to secure alternative resources has become more important nationally. Because of the very strong current on the west coast, with a tidal range of up to 10 m, there are many suitable sites for the application of TCP (tidal current 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 component that can convert tidal current energy into rotational energy to generate electricity. The design optimization of a rotor is very important to maximize the power production. The performance of a rotor can be 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 axis turbine) system, which can generate power regardless of flow direction changes, could be effectively applied to cylindrical structures. A VAT system could give an advantage to a caisson-type breakwater because it allows water to circulate well. This paper introduces a multi-layer vertical axis tidal current power system. A Savonius turbine was designed, and a performance analysis was carried out using CFD. A physical model was also demonstrated in CWC, and the results are compared with CFD.

수직축 풍력 터빈 블레이드의 최적화 설계 및 Vortex 구조 분석 (Optimized blade of small vertical axis wind turbine and its vortex structure analysis)

  • 나지성;고승철;선상규;방유석;이준상
    • 한국가시화정보학회지
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    • 제13권1호
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    • pp.15-20
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    • 2015
  • Sensitivity studies of blade angle and twisted angle are numerically investigated to optimize the Savonius blade. As blade angle increases, the contact area between blade and wind decreases, showing the suppression of the vortex generation near blade. Compared to the blade angle of 0 degree, the blade angle of 20 degree shows about 2.6% increment of power efficiency. Based on the blade angle of 20 degree, sensitivity studies of the twisted angle are performed. The result indicates that the adjustment of the twisted angle causes the torque of blade to increase. Optimized blade can suppress the formation of the vortex structure in rear region. Also, wind flows without disturbance of vortex when passing through the optimized blade. The 1kw vertical wind turbine system with optimized blade can generate 4442.2kWh per year and have 53% capacity factor.