Prediction and Control of University Separation

大学分离的预测与控制

• 批准号: 09045055
• 负责人: TANAKA Kazuhiro
• 金额: $ 3.07万
• 依托单位: Kyushu Institute of Design
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09045055/
• 关键词: Separation; Unsteady flow; Airfoil; Moving body; Vortex; Fluid force; Prediction; Flow control; 非定常; はく離予知; はく離制御; 湯の挙動; 風洞実験; 流れの可視化

The control of the flow separation has been important and interesting phenomenon. Recently, it has been more and more important because higher performance of flow has been demanded in a wide range of industry. The flow field around moving airfoils, such as pitching and translating airfoils, has been investigated energetically. However, few results were obtained by detailed measurements, especially at low Reynolds number region. The study of prediction of separation has begun to carry out and the technique of separation control has not been reported yet.Many studies on unsteady separation around a moving airfoil have been carried out in the numerical and experimental studies. However, most of them have been performed at high Reynolds number region. The many unsolved problems on unsteady separation still remain because the phenomenon occurring around moving airfoils is very complicated. Considering separation control by using a moving airfoil, a large-sized airfoil is not practical because it needs the strong and big mechanical structure and high power. As a result, it is desirable for the separation control to use a small airfoil. Moreover, the study on separation control at low Reynolds number region attracts much attention by researchers developing the micro-electro-mechanical-systems (MEMS).In this study, the mechanism of unsteady separation around pitching airfoils and the characteristics of unsteady fluid forces acting on them at low Reynolds number region have been clarified by the flow visualization and the unsteady fluid forces measurement.

流动分离的控制一直是一个重要而有趣的现象。近年来，由于工业领域对流体性能的要求越来越高，因此它越来越重要。本文对俯仰和平动翼型等运动翼型的绕流流场进行了大量的研究。然而，通过详细的测量得到的结果很少，特别是在低雷诺数区。分离的预测研究刚刚开始，分离控制技术的研究还未见报道，对运动翼型非定常分离的研究主要是在数值和实验方面进行的。然而，其中大多数已经在高雷诺数区域进行。由于绕动翼型的非定常分离现象非常复杂，因此，非定常分离问题仍有许多未解决的问题。考虑到利用运动翼型进行分离控制，大尺寸翼型由于需要强大的机械结构和高功率而不实用。因此，分离控制最好使用小的翼面。此外，低雷诺数区分离控制的研究也引起了微机电系统（MEMS）研究人员的广泛关注。本研究通过流动显示和非定常流体力测量，阐明了低雷诺数区俯仰翼型周围非定常分离的机理以及作用在其上的非定常流体力的特征。

项目成果

H.Tanaka, K.Tanaka, F.Shimizu: ""Dynamic Forces and Vibration Characteristics of a Single Cylinder in low Reduced Velocity Range""FEDSM. 99-7187. (1999)

H.Tanaka、K.Tanaka、F.Shimizu：“低减速范围内单缸的动力和振动特性”FEDSM。

M.Fuchiwaki, K.Tanaka, O.Baysal: ""Dynamic Behavior of Vortices from an Airfoil Undergoing Pitching Motion""ASME, FEDSM. 98-4941. (1998)

M.Fuchiwaki、K.Tanaka、O.Baysal：“机翼进行俯仰运动时的涡流动态行为”ASME、FEDSM。

渕脇正樹,田中和博,田中彰: "ピッチング運動翼より発生するはく離渦の挙動とその構造"日本機械学会論文集(B). 65-632. 1271-1276 (1999)

Masaki Fuchiwaki、Kazuhiro Tanaka、Akira Tanaka：“变桨叶片产生的分离涡流的行为和结构”日本机械工程师学会会刊 (B) 1271-1276 (1999)。

渕脇正樹,田中和博,田中博喜: "ピッチング運動翼に働く非定常流体力"日本機械学会論文集(B). 65-634. 1970-1977 (1999)

Masaki Fuchiwaki、Kazuhiro Tanaka、Hiroyoshi Tanaka：“作用在俯仰叶片上的不稳定流体力”日本机械工程师学会汇刊 (B) 65-634 1970-1977 (1999)。

K.Tanaka, M.Fuchiwaki, H.Tsukamoto, H.Tanaka: "Unsteady Separation and Dynamic Lift around an Airfoil Undergoing Pitching Motion"ASME, FEDSM97-3673. 97・3637. 1-6 (1997)

K.Tanaka、M.Fuchiwaki、H.Tsukamoto、H.Tanaka：“俯仰运动中机翼周围的不稳定分离和动态升力”ASME，FEDSM97·3673（1997）。