Pressure Drop in Solar Power Plant Chimneys
Pressure Drop in Solar Power Plant Chimneys
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DOI：
10.1115/1.1564077
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发表时间：
2002
影响因子：
2.3
通讯作者：
T. V. Backström;A. Bernhardt;A. Gannon
中科院分区：
文献类型：
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作者：
T. V. Backström;A. Bernhardt;A. Gannon
本文研究了通过具有代表性的高太阳能烟囱的流动，该烟囱具有七组带有径向辐条的内部支撑轮。本文提供了在直径为 0.63 m 的实验室规模烟囱模型（带和不带支撑轮）中测得的实验数据。烟囱模型一端的风扇要么吸入或吹过烟囱中的气流。测得的摩擦压降高于光滑壁的理论值，而旋转、吹流则使摩擦压降又增加了 12%。七个支撑轮，每个都有十二个辐条，每个辐条由一对矩形型材组成，造成的压降比壁摩擦力大一个数量级。对于吸入流，强制、旋流、扰动流使压降增加高达 36%。支撑轮还将出口动能系数增加到 1.26，最后一个轮位于烟囱出口。这种效应可以与支撑轮阻力相结合，减少通过烟囱的流量。大型烟囱的设计者应注意尽量减少支撑轮的数量，并尽可能简化辐条部分。如果可能，顶部支撑轮应距离出口足够远，以便水流在经过墙壁上的辐条附件边缘后重新附着到墙壁上。版权所有 © 2002 ASME
The paper investigates the flow through a representative tall solar chimney with seven sets of internal bracing wheels with radial spokes. The paper presents experimental data measured in a 0.63 m diameter laboratory scale chimney model with and without bracing wheels. A fan at one end of the chimney model either sucked or blew the flow through it. The measured friction pressure drop was higher than theoretical values for smooth walls, and swirling, blown flow increased it by another 12%. The seven bracing wheels, each had twelve spokes, each spoke consisting of a pair of rectangular section bars, caused order of magnitude larger pressure drops than wall friction. For the sucked-through flow the forced, swirling, disturbed flow increased the pressure drop by up to 36%. Bracing wheels also increased the exit kinetic energy coefficient to 1.26 with the last wheel at the chimney exit. This effect could in combination with the bracing wheel drag reduce flow through the chimney. Designers of large chimneys should take care to minimise the number of bracing wheels, and possibly to streamline spoke sections. If possible, the top bracing wheel should be far enough from the exit for the flow to reattach to the wall after passing over the spoke attachment rim at the wall.Copyright © 2002 by ASME