NACA4412構型垂直式軸向風機動態數值研究

Dynamic Simulation of a Vertical Axis Wind Turbine with NACA4412 Airfoil

徐子圭(Uzu-Kuei Hsu) ； 戴昌賢(Chang-Hsien Tai) ； 林健耀(Chien-Yao Lin)

《航空太空及民航學刊.系列B》 41卷1期 (2009/04) Pp. 11-16

https://doi.org/10.6124/JAAA.200904_41(1).02

摘要

本研究以CFD計算流體力學有限體積法SIMPLE算則?主，運用二階上風非定常隱式法計算，並配合經網格相依性測試之網格（旋葉弦長度?1、第一層網格厚度1.0×10^(-3)、網格生成倍率1.08）、k-ε紊統模式，另結合滑動網格法及外掛結構運動角動量守恆方程副程式，可成功模擬具三片式NACA4412構型垂直式軸向式風機(VAWT)於無負載下隨入口流作動之流固耦合流場特性，並分析其氣動力參數，以作?未來垂直式軸向風力機之設計之方法及參考依據。研究結果發現在入口流速25m/s時，風機每片旋翼Cm值介於2至－0.8間，屬正向力矩逆時針運轉，旋翼轉至入流面時旋翼上之分離泡會有消失現象，同時下游流之下方有一停駐渦旋發生，強度會隨旋翼轉動而有增加或減弱之趨勢。

關鍵字

垂直軸向式風力機 ； 計算流力 ； 滑動網格 ； NACA4412 ； 流固耦合

並列摘要

This study uses the unsteady 2nd-orde upwind implicit SIMPLE algorithm, sliding grid, and coupling a user-defined subroutine of the degree freedom dynamic method as its solver to simulate the on windload fluid-structure interaction (FSI) flowfield of a vertical axis wind turbine (VAWT) with the NACA4412 airfoil configuration, and analysis the aerodynamic characteristics. After the grid independent test, this study select the first level thickness of the mesh is 1.0×10^(-3) (airfoil cord=1, mesh growth ratio=1.08), and k-ε turbulent model. From the results, the Cm of every rotational wing is between -0.8 to 2 which the inlet velocity is 25 m/s. The rotation direction is anti-clockwise. The separation bubble above the leading of the rotational wing is disappearing when the wing rotors into the free stream region. There is a stagnation vortex at the lower in the downstream, and the vorticty strength is affected by wing motion.

並列關鍵字

VAWT ； CFD ； Sliding grid ； NACA4412 ； FSI