Axial Fan Performance under the Influence of a Uniform Ambient Flow Field

IF 0.9 Q4 ENGINEERING, MECHANICAL

International Journal of Rotating Machinery Pub Date : 2018-03-01 DOI:10.1155/2018/6718750

Till Heinemann, S. Becker

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引用次数: 5

Abstract

In their application to air-cooled condensers, axial fans are often subject to the detrimental influence of ambient flow fields at their inlet or outlet. While effects have been investigated mostly under perpendicular cross-flow conditions on fans operating as part of an array in their target design point, this study aims at examining the integral influence of uniform ambient flow fields on a single axial fan over a wide operating range. For this purpose, a wind tunnel fan test rig has been designed and assessed. Multiple angles between uniform ambient flow field and fan axis are examined in their integral influence on the characteristic curve of two distinct industrial axial fans with varying inlet modifications. Increasingly with the fan flow rate, perpendicular inlet cross-flow was found to always have a detrimental influence on fan performance. The straight bladed fan reacted less sensitively than the forward skewed fan, and the adverse cross-flow influence could be reduced with an inlet guard grille and with short conical shroud extensions. Cross-flow at the fan outlet showed potential static fan pressure increases at low flow rates.

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均匀环境流场影响下的轴流风机性能

在应用于风冷冷凝器时，轴流风机的入口或出口经常受到环境流场的不利影响。虽然主要在垂直横流条件下研究了风机在其目标设计点作为阵列一部分运行时的影响，但本研究旨在检验均匀环境流场在宽运行范围内对单轴流风机的整体影响。为此，设计并评估了一个风洞风扇试验台。考察了均匀环境流场和风机轴线之间的多个角度对不同入口修改的两个不同工业轴流风机特性曲线的整体影响。随着风机流量的增加，垂直入口横流总是对风机性能产生不利影响。直叶片风扇的反应不如前向倾斜风扇灵敏，并且通过入口防护格栅和短锥形导流罩延伸可以减少不利的横流影响。风机出口处的横流表明，在低流速下，潜在的静态风机压力增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Rotating Machinery ENGINEERING, MECHANICAL-

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： This comprehensive journal provides the latest information on rotating machines and machine elements. This technology has become essential to many industrial processes, including gas-, steam-, water-, or wind-driven turbines at power generation systems, and in food processing, automobile and airplane engines, heating, refrigeration, air conditioning, and chemical or petroleum refining. In spite of the importance of rotating machinery and the huge financial resources involved in the industry, only a few publications distribute research and development information on the prime movers. This journal is the first source to combine the technology, as it applies to all of these specialties, previously scattered throughout literature.