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首页> 外文会议>International Conference on Built Environment and Public Health(BEPH2004); 20041206-08; Shantou(CN) >Characteristics of Buoyancy Driven Single-Sided Natural Ventilation through Horizontal Openings
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Characteristics of Buoyancy Driven Single-Sided Natural Ventilation through Horizontal Openings

机译：通过水平开口进行浮力驱动的单侧自然通风的特性

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摘要

An experimental study of the phenomenon of buoyancy driven natural ventilation through single-sided horizontal openings is described in this paper. The experimental analysis was performed in a full-scale laboratory test rig. The basic nature of air flow through the single-sided openings was investigated. The bi-directional air flow was measured using constant injection tracer gas technique. Variable parameters included the air flow rate, the air velocity, the temperature difference between the rooms and the dimensions of the horizontal openings. The measurements were made for opening ratios L/D in the range of 0.115 to 4.445, where L and D are the length of the opening and the diameter of the opening, respectively. The smoke visualization showed that the flow patterns are highly transient and unstable, and the air flow rates oscillate with time. The air flow rate can be obtained in the correlation between Froude number Fr (dimensionless air flow rate) and L/D ratio. The tendency of Fr with L/D is good agreement with Epstein's formula obtained from brine-water measurements, but the Fr value shows considerable deviations between the air flow measurements and the Epstein's formula. So, the full scale air flow measurements are quite important and much more reasonable than the scale brine-water measurements, even though the brine-water technique has some advantages.
机译：本文描述了通过单侧水平开口进行浮力驱动自然通风现象的实验研究。实验分析是在大型实验室测试平台上进行的。研究了通过单侧开口的气流的基本性质。使用恒定注入示踪气体技术测量双向气流。可变参数包括空气流速，空气速度，房间之间的温度差以及水平开口的尺寸。对开口率L / D在0.115至4.445的范围内进行测量，其中L和D分别是开口的长度和开口的直径。烟雾可视化显示，流动模式是高度瞬态且不稳定的，并且空气流速会随着时间而振荡。空气流量可以通过弗劳德数Fr（无因次空气流量）和L / D比之间的相关性来获得。具有L / D的Fr趋势与从盐水测量获得的爱泼斯坦公式非常吻合，但是Fr值显示空气流量测量值与爱泼斯坦公式之间存在相当大的偏差。因此，即使盐水技术具有某些优势，但全面的空气流量测量非常重要，并且比盐水盐水测量更为合理。

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