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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 趙修武 | - |
dc.contributor.author | Ke-Chu Lee | en |
dc.contributor.author | 李可掬 | zh_TW |
dc.date.accessioned | 2021-05-19T17:44:04Z | - |
dc.date.available | 2021-05-19T17:44:04Z | - |
dc.date.copyright | 2018-08-18 | - |
dc.date.issued | 2018 | - |
dc.date.submitted | 2018-08-15 | - |
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European wind energy conference and exhibition, 1, 10-20. | - |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7456 | - |
dc.description.abstract | 本文建立基於物體力項及紊流源項之風機制動盤跡流模型,以目標風機之幾何及運轉參數描述制動盤作用於流體之物體力項,並以紊流源項描述因葉片旋轉運動產生的紊流生成現象。本研究使用FORTRAN語法開發風機制動盤跡流模擬程式WIFA3D,利用SIMPLE演算法分離壓力與速度耦合關係,平行求解三維穩態連續方程式、動量方程式以及修正k-ε紊流模型。跡流模型常數c_k1及c_k2在風洞實驗案例中建議採用1.5及0.95;在離岸風場案例中建議採用及3.0及0.70,說明跡流模型常數對風機幾何及紊流尺度具有變異性。本文以風洞測量值驗證本研究的制動盤跡流模型,發現該模型能有效描述跡流軸向速度、剪應力及紊流強度分佈。本研究的風場模擬結果能合理預測風機發電量,發現風場中下游風機輸出功率漸趨穩定。此現象為紊流生成及紊流消散達成動態平衡的結果,前者造成跡流擴散並增強跡流與外圍氣流混合,後者為避免跡流產生持續擴散的現象。 | zh_TW |
dc.description.abstract | This thesis describes a wake model which incorporates an actuator disk with a body force and turbulence source approach. The force source simulates the flow deceleration effect based on the wake flow of the wind turbine, whereas the turbulence source models the turbulence generation resulting from the rotational motion of the turbine rotor. The investigated three-dimensional flow field is described by the steady continuity and momentum equations together with a modified k-ε turbulence model, which are solved by an in-house, parallelized, RANS-based Fortran code, WIFA3D, which employs a SIMPLE algorithm to decouple pressure and velocity. The proposed turbulence model also includes the turbulence dissipation arising in the atmospheric condition. The model constants are calibrated with a wind tunnel experiment and a power measurement from Horns Rev offshore wind farm. The constant pair of the proposed model is c_k1=1.5 and c_k2=0.95 for small scale flow, as well as c_k1=3.0 and c_k2=0.70 for large scale flow, emphasizing the importance of a proper choice of model constants for different geometrical features and turbulence scales. The simulation result of the wind tunnel flow is validated against the spatial distribution of the streamwise velocity, the shear stress and the turbulence intensity, in addition to the output power. In the case of wind farm simulation, an almost stable output power is predicted for downstream wind turbines in a cascading arrangement, which gives a favorable agreement with the field measurement. The reason for this effect is a dynamic equilibrium between the turbulence strength, which enhances the wake expansion as well as the mixing process, and the turbulence dissipation, which prevents the wake from a complete velocity recovery. | en |
dc.description.provenance | Made available in DSpace on 2021-05-19T17:44:04Z (GMT). No. of bitstreams: 1
ntu-107-R06525013-1.pdf: 5620465 bytes, checksum: b7a5bac7e9ca4cefed64dbebaf7e3a4a (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | Abstract II
Nomenclature V List of Figures IX List of Tables XI Chapter 1 Introduction 1 Chapter 2 Review of Numerical Wake Models 2.1 Description of Wake Characteristics 4 2.2 Numerical Wake Model 5 Chapter 3 Numerical Model 3.1 Assumption 12 3.2 Mathematical Model 13 3.3 The Proposed Wake Model 16 3.4 Numerical Framework 26 3.5 Computational Domain and Boundary Conditions 29 3.6 Mesh Distribution and Grid Dependency 33 Chapter 4 Numerical Results 4.1 Description of Simulation Cases 38 4.2 Calibration of Parameters 42 4.3 Characteristics of Model Constants 82 4.4 Power Analysis 84 Chapter 5 Conclusion 86 Chapter 6 Discussion and Future Work 87 References 88 | - |
dc.language.iso | en | - |
dc.title | 基於跡流模型之風機功率預測 | zh_TW |
dc.title | A Wake Model for Wind Turbine Power Prediction | en |
dc.type | Thesis | - |
dc.date.schoolyear | 106-2 | - |
dc.description.degree | 碩士 | - |
dc.contributor.oralexamcommittee | 蔡進發,林宗岳,鍾年勉,吳毓庭 | - |
dc.subject.keyword | 制動盤模型,紊流源,功率預測,WIFA3D, | zh_TW |
dc.subject.keyword | Actuator Disk Model,Turbulence Source,Power Prediction,WIFA3D, | en |
dc.relation.page | 92 | - |
dc.identifier.doi | 10.6342/NTU201803554 | - |
dc.rights.note | 同意授權(全球公開) | - |
dc.date.accepted | 2018-08-15 | - |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
顯示於系所單位: | 工程科學及海洋工程學系 |
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