H型垂直風機非定常之研究

Unsteady Studies of a H-type Vertical Axial Wind Turbine

林永堂(Yung-Tang Lin)

指導教授 ： 戴昌賢 ； 徐子圭

國立屏東科技大學/工學院/車輛工程系所/碩士(2010年)

https://doi.org/10.6346/NPUST.2010.00168

摘要

本研究以計算流體有限體積法算則、k-ε紊流模組結合滑動網格法，模擬分析NACA0018與NACA4412兩種不同翼型之垂直式風機於不同尖速比下的流場現象與力矩值變化。研究顯示二維模擬結果方面，尖速比(λ)低之風機葉片會形成較多的渦流，下游葉片容易受到上游葉片尾流所影響；而尖速比(λ)高之風機葉片較無渦流現象。NACA0018翼型風機於尖速比(λ)低時會產生較佳的力矩，NACA4412翼型則是於尖速比(λ)高時有較佳力矩。風機葉片形成第一個渦流的角度會影響葉片產生最高Cm值的時機，當尖速比(λ)越大，形成渦流的角度越延後且渦流範圍越小；兩種翼型風機都在相同尖速比下有相似的力矩值。NACA0018翼型風機三維模擬結果方面，由於翼尖渦流與三維效應的影響導致Cm值提高的幅度不如二維模擬結果，但是於Cm值降低的區段由於三維效應影響反而會優於二維模擬結果。本研究垂直式風機二維模擬與三維模擬結果都在尖速比(λ)為1.047時會產生最佳力矩值。

關鍵字

垂直風機 ； 尖速比 ； 翼尖渦流 ； 數值模擬 ； 滑動網格

並列摘要

In this study, the different of TSR, tip speed ratio, used to simulate and analyze the flowfield over a VAWT, vertical axial wind turbine, with NACA0018 and NACA4412 airfoil configuration. The CFD incompressible finite volume method, SIMPLE scheme, coupling the k-ε turbulence model and sliding mesh method are employed to solve the complex flowfield and analyze the torque efficiency. In the results of 2D simulations, the VAWT with NACA0018 airfoil was suitable for high TSR, and the VAWT with NACA4412 airfoil was suitable for low TSR. When High TSR, the vortices is generated according to the rotating angle will be delay and the vortices are smaller. In the three-dimensional simulations, the Cm value is lower than the two-dimensional simulation results because of the 3D effects, tip vortex and spanwise flow. The VAWT with the best torque produced both in the 2D and 3D simulated results at TSR=1.047.

並列關鍵字

VAWT ； TSR ； tip vortex ； NACA0018 ； NACA4412

參考文獻

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