複動式合成噴流之流場顯影及特性探討

Study of Double Acting Synthetic Jet

周志成(Chih-Cheng Chou)

指導教授 ： 王安邦

國立臺灣大學/工學院/應用力學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.03085

摘要

本文所探到的主要分成兩個部分，首先對於單動式與複動式合成噴流致動裝置進行流場特性之比較。由結果可以發現，複動式合成噴流致動裝置所產生的渦漩由於環狀噴流做與中央噴流相反行程的作動所以在渦漩前進的速度上會慢上約7.8%以下，但是渦度隨著頻率增加差距會越來越大，在頻率為12Hz時渦度已經是單動式合成噴流的2.48倍了。此一優勢能讓渦漩傳送的動量更強更遠，而且渦漩結構也更緊實集中。
再來針對複動式合成噴流致動裝置進行更進一步的觀察與分析，在此可以發現，渦漩的出口速度與渦度強弱與腔內的體積及薄膜形狀無很大的關係，其主要與薄膜振動頻率以及流量有關，故要進行最佳化設計應該以此方向進行改進，最終能夠提供微小化嘗試設計之方向以擴大其應用範圍。

關鍵字

合成噴流 ； 流場顯影 ； 複動式合成噴流

並列摘要

There are two section in the main object of this thesis : First of all, I would like to discuss the advantage and shortage of Single Acting Synthetic Jet Actuator( SSJA) and Double Acting Synthetic Jet Actuator ( DSJA ) . The advantage of DSJA compared with SSJA is that the fluid sucked into the inner chamber is from diffuser but from the outer of the central nozzle. But the shortage is the velocity of the center of the vortex is slower. And also you can see the flow visualization of SSJA and DSJA. Here it shows how the fluid sucked into the inner chamber through the annual jet.

The second section is the discussion of the performance of DSJA. In this section, the velocity profiles in particular time and position will be fully discussed. And then we have the preliminary direction to optimize the performance of DSJA. It will provide a direction to design the micro structure of DSJA so that the application of DSJA will be increased enormously.

並列關鍵字

synthetic jet ； double acting synthetic jet

參考文獻

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