Capture envelopes of rectangular hoods in cross drafts.

AIHAJ : a journal for the science of occupational and environmental health and safety Pub Date : 2001-09-01 DOI:10.1080/15298660108984655

R. Huang, S. Sir, Y. K. Chen, W. Yeh, C. W. Chen, C. C. Chen

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引用次数: 15

Abstract

The suction fields of the rectangular hoods of various aspect ratios varying from 0.1 to 10 that are subject to the influence of cross drafts were experimentally studied in an apparatus consisting of a hood model/wind tunnel assembly. The velocity field on the symmetry plane was measured with a two-component laser Doppler anemometer. Being under the influence of cross draft, the suction field presents a characteristic capture envelope, which is described by a dividing streamline. The characteristics of the capture envelope were found to be determined by the cross-draft to hood-suction velocity ratio R and the hood-opening aspect ratio AR. The flow characteristics of the hoods with aspect ratios less than unity were dramatically different from those with aspect ratios greater than one. If areas of the hood openings had the same values, the hydraulic-diameter normalized characteristic length scales of the capture zone of the square hood were as same as those of the circular hood. When the diameter of a circular hood was equal to the width of a square hood, the physical dimensions of the capture zones created by these two hoods coincided with each other.

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在交叉穿流中捕捉矩形引擎盖的外壳。

在由风洞组件组成的装置上，实验研究了不同展弦比(0.1 ~ 10)的矩形罩的吸力场对横向气流的影响。用双分量激光多普勒风速仪测量了对称面上的速度场。在横向气流的影响下，吸力场呈现出一个特征捕获包络线，该包络线用分岔流线来描述。结果表明，捕集包线特性主要由交叉气流与吸油烟机速度比R和开油烟机展弦比AR决定，展弦比小于1的捕集烟机与展弦比大于1的捕集烟机的流动特性存在显著差异。当引擎盖开口面积值相同时，方形引擎盖与圆形引擎盖的水力-直径归一化特征长度尺度相同。当圆形引擎盖的直径等于方形引擎盖的宽度时，这两个引擎盖所产生的捕获区域的物理尺寸相互吻合。

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AIHAJ : a journal for the science of occupational and environmental health and safety

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