Development of Advanced Diffuser by Controlling Flow Actively

通过主动控制流量开发先进扩压器

• 批准号: 05555054
• 负责人: KIYA Masaru
• 金额: $ 6.53万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555054/
• 关键词: Diffuser; Unsteady Flow; Separation; Reattachment; Pressure Recovery; Wake; Active Control; Vortex Interaction; 能率制御; はく離・再付着流れ; 非一様速度分布; 非定常変動; かく乱; 制御; 効率

A final goal of this study is to develop a design of an advanced diffuser with high efficiency. Effects of an incoming turbulent disturbance on performance in a two-dimensional diffuser are studies experimentally. Main results of this study are summarized as follows.(1) An incoming turbulent wake of a moving rod in a plane perpendicular to a main flow improves a pressure recovery coefficient of the two-dimensional diffuser with and without separation. This is a new finding in this field.(2) Effects of a quasi-steady incoming wake of the rod on performance in the diffuser are investigated. The rod is installed upstream of the inlet of the diffuser. Time-mean velocity distributions and turbulent intensity distributions are presented for several combinations of the diameter and position of the rod. It is found that there exists an optimum combination for the improvement and reduction of loss. An interaction between the wake and the separated shear layr are visualized in a water channel. There is no separation when the pressure recovery coefficient attains the maximum.(3) A new concept of a design of the diffuser under the unsteady flow condition is discused. The separated shear-layr is controlled actively by using a sinusoidal disturbance. An application of the control to the diffuser with separation is discussed in this study.

这项研究的最终目标是开发一种高效的先进扩散器设计。通过实验研究传入的湍流扰动对二维扩散器性能的影响。本研究的主要结果总结如下：(1)在垂直于主流的平面上移动杆的传入湍流尾流提高了有分离和无分离的二维扩压器的压力恢复系数。这是该领域的一个新发现。(2)研究了杆的准稳态传入尾流对扩压器性能的影响。该杆安装在扩散器入口的上游。给出了杆的直径和位置的几种组合的时间平均速度分布和湍流强度分布。发现存在改善和减少损耗的最佳组合。在水道中可以看到尾流和分离的剪切层之间的相互作用。当压力恢复系数达到最大时,不发生分离。(3)讨论了非定常流动条件下扩压器设计的新理念。通过使用正弦扰动来主动控制分离的剪切层。本研究讨论了控制在分离扩散器上的应用。

项目成果

M.KIYA,O.MOCHIZUKI,Y.IDO,H.KOSAKU: "Structure of Turbulent Leading-Edge Separation Bubble of a Blunt Circular Cylinder and its Response to Sinusoidal Disturbances" Journal of Wind Engineering and Industrial Aerodynamics. vol. 49. 227-236 (1993)

M.KIYA，O.MOCHIZUKI，Y.IDO，H.KOSAKU：“钝圆柱体的湍流前沿分离气泡的结构及其对正弦扰动的响应”风工程与工业空气动力学杂志。

清水昌幸,木谷勝,望月修,井門康司: "周期的かく乱に対する乱流はく離泡の応答(強い撹乱に対する応答およびせん断層の構造変化)" 日本機械学会論文集(B編). 61(586). 2008-2015 (1995)

Masayuki Shimizu、Masaru Kitani、Osamu Mochizuki、Koji Imon：“湍流分离气泡对周期性扰动的响应（对剪切层的强扰动和结构变化的响应）”日本机械工程师学会汇刊（ed.B）。 586).2008-2015(1995)

望月 修・木谷 勝・田尾 浩之: "非定常効果によるディフューザの性能変化" 流れの計測. 11巻14号. 40-46 (1993)

Osamu Mochizuki、Masaru Kitani 和 Hiroyuki Tai：“不稳定效应导致的扩压器性能变化”，第 11 卷，第 14 期。40-46 (1993)

望月修,木谷勝,秋山英和: "後流における2次元ディフューザ内のはく離制御" 流体力学会誌. 13巻別冊. 160-163 (1994)

Osamu Mochizuki、Masaru Kitani、Hidekazu Akiyama：“尾流中二维扩散器的分离控制”，日本流体动力学学会杂志，第 13 卷，单独发行（1994 年）。

O.MOCHIZUKI,M.KIYA,H.TAO: "Effect of an Incoming Turbulent Wake on Performance in a 2D-Diffuser" Nagare no Keisoku. vol. 11, No. 14. 40-46 (1993)

O.MOCHIZUKI、M.KIYA、H.TAO：“传入湍流尾流对 2D 扩散器性能的影响”Nagare no Keisoku。