Towards optimal aerodynamic design of wind catchers: Impact of geometrical characteristics

RENEWABLE ENERGY

卷:168

Article

Alsailani, M.¹  Montazeri, H.¹  Rezaeiha, A.^1,2 

[1] Eindhoven Univ Technol, POB 513, NL-5600 MB Eindhoven, Netherlands

[2] Katholieke Univ Leuven, Kasteelpk Arenberg 40 Bus 2447, B-3001 Leuven, Belgium

关键词: Wind energy;    Ducted wind turbine;    Ventilation;    Zero-energy buildings;    Optimization;    Computational fluid dynamics (CFD);   

DOI  :  10.1016/j.renene.2020.12.053

来源: Elsevier

【 摘 要 】

This paper presents a detailed parametric analysis of the impact of geometrical characteristics of wind catchers on their flow features to enhance the effectiveness of cross-ventilation strategies of buildings. The following geometrical characteristics are evaluated in detail: (i) ceiling tilt angle, (ii) radius of the outer-corner bend, (iii) leeward-side tilt angle, (iv) straight inlet extension length, (v) nozzle-shaped inlet extension radius, and (vi) radius of the inner-corner bend. In addition, the impact of using guide vanes in the bend of wind catchers is systematically investigated. High-resolution coupled (outdoor wind flow and indoor airflow) 3D steady RANS CFD simulations are performed for 40 different wind catcher geometries. The CFD simulations are based on a grid-sensitivity analysis and are validated by comparing with two wind-tunnel measurements. The results show that the use of straight and nozzle-shaped inlet extensions can significantly increase the airflow rate. The maximum increase is about 23%, which is achieved for the straight inlet extension length S/D = 1 (D is wind-catcher depth). Guide vanes are also found to effectively improve the flow uniformity inside wind catchers and significantly enhance the airflow rate. This enhancement can go up to 29% when guide vanes are implemented in combination with a straight inlet extension with S/D = 0.375. The results of the present study support the optimal aerodynamic design of wind catchers. (c) 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

【 授权许可】

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