合成噴流與穿越流交互作用研析

Investigation of a Synthetic Jet in Crossflows

林敬淳(Jing-Chun Lin)

指導教授 ： 楊安石

國立臺北科技大學/機電學院/能源與冷凍空調工程系碩士班/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00221

摘要

本研究目的係解析合成噴流與穿越流之交互作用流場結構，以探討合成噴流致動器應用於主動式控制流場機制，俾能整體評估致動器產生噴射氣流於提昇系統氣動力與操控特性的效益。本文理論模型基於三維、暫態、等溫、可壓縮紊流之質量與動量方程式，並將一可驅動的薄膜平板，在給定的表面位置上模擬為預設的位移移動式邊界條件。文中利用計算流體力學方法詳細檢視穿越流與合成噴流流場結構交互作用之複雜週期時變流型，接著將不同暫態下的週期性速度流場和Rumsey等人實驗量測數據比對，以驗證模型與數值計算程式正確性。分析亦擴及探討裝設於機翼表面之致動器，以不同角度吹出合成噴流對穿越流場的氣動特性(此涵括迴流氣泡區範圍、翼表面壓力分佈、氣動昇力係數曲線)的影響，並考慮置入噴流致動器於機翼以討論給定攻角與自由流速下升力增大效果。

關鍵字

合成噴流 ； 主動式氣流控制 ； 微致動器 ； 渦流結構

並列摘要

The goal of active flow control research is to develop a cost-effective technology that has potential for advancing aerodynamic performance and maneuvering compared to conventional approaches. In operation, it can be vital to thoroughly understand the flow characteristics of the formation and interaction of a synthetic jet with external crossflow before formulating a practicable active flow control strategy. Therefore, this study is focused on examining the flow pattern of synthetic jets under the cross-flow effect to probe the mechanism of applying SJA to active flow control. In the analysis, the theoretical model used the transient three-dimensional conservation equations of mass and momentum for compressible, isothermal, turbulent flows. The motion of a movable membrane plate was also treated as the moving boundary by prescribing the displacement on the plate surface. The predictions by the computational fluid dynamics (CFD) code ACE+® were compared with measured transient phase-averaged velocities of Rumsey et al. for code validation. The CFD software was used to explore the time evolution of the development process of the synthetic jet and its interaction within a turbulent boundary layer flow for a complete actuation cycle. Numerical simulations were extended using the verified computer tool to resolve the aerodynamic properties under different blowing conditions.

並列關鍵字

Synthetic jet ； active flow control ； microactuators ； vortex structure

參考文獻

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