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首页> 外文会议>American Society of Mechanical Engineers(ASME) Heat Transfer/Fluids Engineering Summer Conference 2004(HT/FED 2004) vol.3; 20040711-15; Charlotte,NC(US) >EXPERIMENTAL INVESTIGATION OF THE FLOW FIELD OF A CEILING FAN
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EXPERIMENTAL INVESTIGATION OF THE FLOW FIELD OF A CEILING FAN

机译：吊扇流场的实验研究

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摘要

A ceiling fan is the predominating comfort provider in tropical regions worldwide. It consists of an assembly of an electric motor with 3-4 blades suspended from the ceiling of a room. Despite its simplicity and widespread use, the flow induced by a ceiling fan in a closed room has not been investigated, and sub-optimal designs are in wide use. There is vast potential for energy conservation and improved comfort by developing optimized fan designs. This work develops a fundamental understanding of the flow characteristics of a ceiling operating inside a closed room. Using smoke from thick incense sticks, the flow field created by the ceiling fan is visualized. In most regions, the flow is periodic and three-dimensional. Vortices are seen to be attached to the blade tip and hub, which reduces downward flow and increases energy consumption. Only the middle 75% of blade actually pushes the air downwards, and the comfort region is limited to a cylinder directly under the blades; velocities in this region were measured with a vane anemometer. Winglets and spikes attached to the blade tip disrupted the tip vortex, and increased downflow by about 13% without any increase in power consumption.
机译：吊扇是全球热带地区主要的舒适设备提供商。它由一个电动机组件组成，该电动机具有从房间天花板悬挂的3-4个叶片。尽管其简单和广泛使用，但尚未研究由吊扇在封闭的房间中引起的气流，并且次优设计被广泛使用。通过开发优化的风扇设计，在节能和提高舒适度方面具有巨大潜力。这项工作使人们对封闭室内的天花板的流动特性有了基本的了解。使用浓香中的烟雾，可以看到吊扇产生的流场。在大多数地区，流量是周期性的和三维的。涡流被认为附着在叶片的尖端和轮毂上，从而减少了向下流动并增加了能耗。实际上只有75％的叶片实际上将空气向下推，舒适区域仅限于叶片正下方的圆柱体。用风速计测量该区域的速度。附着在叶片末端的小翼和尖刺破坏了叶片的涡旋，使下流增加了约13％，而功耗没有增加。

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