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Unsteady Viscous Flow Analysis around Horizontal Axist Wind Turbine Rotor using Vortex and Panel Methods

Unsteady Viscous Flow Analysis around Horizontal Axist Wind Turbine Rotor using Vortex and Panel Methods
使用涡街法和面板法分析水平轴风力发电机转子周围的非定常粘性流
批准号:
09650184
负责人:
HASEGAWA Yutaka
金额:
$2.5万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
1997
资助国家:
日本
项目状态:
已结题
起止时间:
1997 至 1998

项目摘要

项目成果

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中文摘要
翻译
本课题在1997 ~ 1998学年期间,采用涡方法沿着面元法(边界元法),为水平轴风力机转子叶片周围的不可压缩粘性流场的数值计算工具奠定了基础。涡方法是分析高雷诺数非定常外流的有力工具之一。本项目的最终目标是估算转子叶片附近的三维流动性质,包括叶根附近的流动分离,这是现有预测模型难以描述的。(梅洛12 ; MITI机械工程实验室设计)进行了分析。在该模型中,来自物体表面的涡被处理为涡面和离表面一定距离处的涡滴。与采用涡方法的第二层模型计算相比,第三层模型由于引入了大量的涡,计算时间长,流场不稳定性大,详细考察了叶片面元离散方法以及面元数对计算结果的影响,特别是在尾缘附近,适用于MELO 12翼型和对称Joukowski翼型。因此,在后缘人为地给定一个较小的厚度可以改善计算的收敛性,并提供更真实的结果。
英文摘要
This project has been proceeded to establish a basis of numerical calculation tool for analyzing incompressible viscous flow fields around rotor blades of horizontal axis wind turbines, adopting a vortex method along with a panel method (boundary element method) within the period of 1997 and 1998 of academic years. The vortex method is one of the powerful tool for the analysis of high Reynolds number, unsteady and outer flows. The final objective of the project is to estimate three dimensional flow nature in the vicinity of the rotor blade including the flow separation near the blade root, which has been difficult for the existing prediction models to describe.At the beginning of the project, the flow around two dimensional airfoil section (MELO 12 ; designed by Mechanical Engineering Laboratory of MITI) was analyzed applying mainly the third level model of the vortex method. In this model the vortices from the surface of the body are treated as the vortex sheets and the vortex blobs at a certain distance from the surface. Compared with the calculation by the second level model of the vortex method, the third level model consumes longer calculation time and provides larger instability of the flow fields because of larger number of vortices introduced for the calculation.Effects of discretizing method of the blade surface into panels as well as panel number on the calculated results were examined carefully especially near the trailing edge, applying to the airfoil sections of MELO12 and symmetric Joukowski. As a result, a small thickness artificially given at the trailing edge can improve the convergency of the calculation and provide more realistic results.
期刊论文(0)
专著(0)
科研奖励(0)
会议论文
今村博,他5名: "渦法による翼型周りの流れの解析に関する研究" 日本機械学会講演論文集. 98-1. 307-308 (1998)
Hiroshi Imamura 等 5 人:“使用涡流法分析翼型件”,日本机械工程师学会会议录 98-1(1998 年)。
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通讯作者:
Y.Hasegawa, et al.: "Study of the Flow Analysis around the Airfoilby Vortex Method (in Japanese)" Proceedings of JSME Fluid Engineering Division. 97-62, II-25. 1-2 (1997)
Y.Hasekawa 等人:“涡流法周围翼型流动分析的研究(日文)”JSME 流体工程部论文集。
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今村博,他2名: "渦法による翼型周りの流れの解析に関する研究" 日本機械学会講演論文集(液体工学部門ト-クイン). 983-1. 129-130 (1998)
Hiroshi Imamura 等 2 人:“使用涡流法分析翼型周围的流动的研究”日本机械工程师学会会议记录(流体工程系 Toquin)983-130(1998 年)。
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長谷川豊,他3名: "渦法による翼型周りの流れの解析に関する研究" 日本機械学会講演論文集(流体工学部門トークイン). 97-62,II-25. 1-2 (1997)
Yutaka Hasekawa 等 3 人:“使用涡流法分析翼型件的研究”日本机械工程师学会会议录(流体工程系讲座)97-62,II-25( 1997)
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