对转垂直轴风力机h转子Darrieus型数值研究

IF 1.1 Q4 ENGINEERING, MECHANICAL
Vivien S. Djanali
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引用次数: 0

摘要

为了提高V垂直轴风力机(VAWT)的性能,发明了一种新的对转Darrieus涡轮结构。这种配置增加了发电机的相对转速,从而产生更高的输出功率。众所周知,增加的输出功率可以达到四倍。然而,对转构型对达里乌斯涡轮VAWT气动性能的影响还有待进一步研究。通过与单转Darrieus涡轮VAWT在相同条件下的对比,研究了对转配置的气动性能。自由流速度为5米/秒,TSR在0.2的一到两个区间变化。本研究采用计算流体力学(CFD)三维案例,采用非定常雷诺平均Navier-Stokes (URANS)方程作为湍流模型方程。研究结果表明,在输出功率或功率系数(Cp)方面,对转结构比单转结构具有更大的值。然而,在所有的TSR变化中,就气动性能或力矩系数(Cm)而言,反向旋转优于单旋转。这是由于一级对转转子的展弦比低于单转转子,导致对转时叶尖损失更显著。流体通过1级和2级之间的间隙被发现,这提供了额外的动量。这种现象在方位角为200°-255°时增加Cm。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Study of Contra-Rotating Vertical Axis Wind Turbine H-Rotor Darrieus Type
The new Contra-rotating Darrieus turbine configuration has been invented to enhance the V ertical Axis Wind Turbine (VAWT) performance. This configuration increases the relative rotational speed of the generator, resulting in higher output power. It is well known that the increase can reach four times the output power. However, how the Darrieus turbine VAWT contra- rotating configuration influences its aerodynamic performance still needs to be discovered. This study investigates the aerodynamic performance of the contra-rotating configuration by comparing it to the single-rotating Darrieus turbine VAWT under the same conditions. The freestream speed is 5 m/s, with TSR varying from one to two intervals of 0.2. This research is being completed using Computational Fluid Dynamics (CFD) 3D cases with an Unsteady Reynold Average Navier-Stokes (URANS) equation as the turbulent model equation. The results of this study show that in terms of output power or Power coefficient (Cp), the contra-rotating has a greater value than the single- rotating configuration. However, in all TSR variations, contra-rotating outperforms single-rotating in terms of aerodynamic performance or moment coefficient (Cm). This is due to the fact that the aspect ratio of stage 1 contra-rotating rotor is lower than the single-rotating rotor, resulting in more significant blade tip losses in contra-rotating. Theflow was discovered through the gap between stages 1 and 2 contra-rotating, providing additional momentum. This phenomenon increases Cm at an azimuth angle of 200°-255°.
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来源期刊
自引率
0.00%
发文量
42
审稿时长
20 weeks
期刊介绍: The Journal of Mechanical Engineering & Sciences "JMES" (ISSN (Print): 2289-4659; e-ISSN: 2231-8380) is an open access peer-review journal (Indexed by Emerging Source Citation Index (ESCI), WOS; SCOPUS Index (Elsevier); EBSCOhost; Index Copernicus; Ulrichsweb, DOAJ, Google Scholar) which publishes original and review articles that advance the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in mechanical engineering systems, machines and components. It is particularly concerned with the demonstration of engineering science solutions to specific industrial problems. Original contributions providing insight into the use of analytical, computational modeling, structural mechanics, metal forming, behavior and application of advanced materials, impact mechanics, strain localization and other effects of nonlinearity, fluid mechanics, robotics, tribology, thermodynamics, and materials processing generally from the core of the journal contents are encouraged. Only original, innovative and novel papers will be considered for publication in the JMES. The authors are required to confirm that their paper has not been submitted to any other journal in English or any other language. The JMES welcome contributions from all who wishes to report on new developments and latest findings in mechanical engineering.
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