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Experimental and Numerical Study of Air Movement in Slot-Ventilated Enclosures 狭缝通风罩内空气运动的实验和数值研究
研究了由开槽进气道喷出的平面射流通风的矩形封闭空间的气流模式。实验表明:在一个阈值(约3800)以上,流型与雷诺数无关;射流的柯恩达效应和附着长度受入口和出口直径、流量长度以及到最近壁面的距离的影响;有些几何结构会导致双稳态流动。为了解释实验并获得预测关系,建立了一个数值模型。利用无粘性假设,建立了涡度与流函数之间的函数关系,将涡度方程表示为泊松方程V2y=f(y)。实验结果和已建立的湍流射流理论是确定函数关系的基础。 实验结果与数值结果的比较表明,该模型可用于预测狭缝通风罩内的流场和速度场。引文:加利福尼亚州洛杉矶ASHRAE Transactions第86卷第1部分
Air flow patterns were studied for rectangular enclosures ventilated by a planar jet issuing from a slotted inlet. Experiments showed that:Flow patterns are independent of Reynolds number above a threshold value (approx. 3,800);The coanda effect and attachment length of the jet are affected by inlet and outlet diameter, length of flow, and distance to the nearest wall;Some geometries result in bistable flows.In order to explain the experiments and obtain predictive relations thereof, a numerical model was developed. Using the assumption of inviscidness, a functional relationship between vorticity and stream function was established to express the vorticity equation as a Poisson Equation, V2y = f(y).The experimental findings and established jet theory for turbulent jets were the basis for determining the functional relations. Comparisons between experimental and numerical results showed the model can be used to predict flow patterns and velocity fields in slot-ventilated enclosures.
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