A Parametric Study of Passive Flow Control for a Short, High Area Ratio 90deg Curved Diffuser
A Parametric Study of Passive Flow Control for a Short, High Area Ratio 90deg Curved Diffuser
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短、高面积比 90 度弯曲扩散器被动流量控制的参数研究
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
P. Davies
中科院分区：
文献类型：
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作者：
T. Chong;P. Joseph;P. Davies
本文介绍了一个旨在控制高度不稳定的90 °弯曲扩压器内流动的实验方案的结果。该扩压器是南安普顿大学开放式射流风洞的一个组成部分，具有极短和大面积比的独特结构。在这项研究中，几个被动的流动控制装置，如涡流发生器，编织丝网筛，蜂窝，和导向叶片被用来控制三维扩散流在一个缩小的模型。虽然涡流发生器的成功率较低，但发现其他装置可显著改善弯曲扩压器内部的流量分布均匀性，从而改善出口流量。这项研究表明，在扩压器出口处，至少有三个导向叶片的累积压降系数至少为4.5，以实现扩压器出口处足够的流动均匀性。这些流动调节处理应用于出口尺寸为1.3×1.3 m2的全尺寸扩压器。获得了与缩尺模型扩散器相当的均匀性。本文的研究结果对设计无分离、出口压力畸变最小的弯/直扩压器提供了有价值的指导。
This paper represents the results of an experimental program with the aim of controlling the flow in a highly unstable 90 deg curved diffuser. The diffuser, which is an integral part of an open jet wind tunnel at the University of Southampton, has the unique configuration of extreme shortness and high area ratio. In this study, several passive flow control devices such as vortex generators, woven wire mesh screens, honeycomb, and guide vanes were employed to control the three-dimensional diffusing flow in a scaled-down model. Although less successful for vortex generators, the other devices were found to improve significantly the uniformity of the flow distribution inside the curved diffuser and hence the exit flow. This study suggests that a cumulative pressure drop coefficient of at least 4.5 at the diffuser exit with at least three guide vanes is required to achieve adequate flow uniformity at the diffuser exit. These flow conditioning treatments were applied to the full-scale diffuser with exit dimensions of 1.3×1.3 m2. Flow with comparable uniformity to the scale-model diffuser is obtained. This study provides valuable guidelines on the design of curved/straight diffusers with nonseparated flow and minimal pressure distortion at the exit.