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Experimental and numerical study on natural ventilation performance of various multi-opening wind catchers

机译：多种多开式集水器自然通风性能的实验与数值研究

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摘要

Wind catcher as a natural ventilation system is increasingly used in modern buildings to minimize the consumption of non-renewable energy and reduce the harmful emissions. Height, cross section of the air passages and also place and the number of openings are the main factors which affect the ventilation performance of a wind catcher structure. In this study, experimental wind tunnel, smoke visualization testing and computational fluid dynamic (CFD) modeling were conducted to investigate ventilation performance of wind catchers with different number of openings to find how the number of opening affects hydrodynamic behavior of wind catchers. To achieve this particular aim, five cylindrical models with same cross section areas and same heights were employed. The cross sections of all these wind catchers were divided internally into various segments to get two-sided, three-sided, four-sided, six-sided and twelve-sided wind catchers. The experimental investigations were conducted in an open circuit subsonic wind tunnel. For all these five shapes, the ventilated air flow rate into the test room was measured at different air incident angles. Numerical solutions were used for all these five configurations to validate the proposed measuring techniques and the corresponding wind tunnel results. The results show that the number of openings is a main factor in performance of wind catcher systems. It also shows that the sensitivity of the performance of different wind catchers related to the wind angle decreases by increasing the number of openings. Moreover, comparing with a circular wind catcher a rectangular system provides a higher efficiency.
机译：集水器作为一种自然通风系统，越来越多地用于现代建筑中，以最大程度地减少不可再生能源的消耗并减少有害排放。空气通道的高度，横截面以及位置和开口数量是影响集气装置结构的通风性能的主要因素。在这项研究中，进行了实验性风洞，烟气可视化测试和计算流体力学（CFD）建模，以研究具有不同开口数的集水器的通风性能，以了解开口数如何影响集水器的水动力行为。为了达到这个特定目的，采用了五个具有相同横截面积和相同高度的圆柱模型。在内部将所有这些集热器的横截面分为不同的部分，以得到双面，三面，四面，六面和十二面的集水器。实验研究是在开路亚音速风洞中进行的。对于所有这五个形状，都以不同的空气入射角测量了进入测试室的通风空气流量。对这五种配置使用数值解法来验证所提出的测量技术和相应的风洞结果。结果表明，开口的数量是影响捕风系统性能的主要因素。它还表明，通过增加开孔数量，与风角相关的不同集气器性能的灵敏度会降低。而且，与圆形的风收集器相比，矩形系统提供了更高的效率。

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