標題: 雙壓電致動器幫浦之流固耦合分析
Analysis of the Fluid-Structure Coupling Flow in A Bimorph Piezoelectric Micropump
作者: 陳信宏
Chen, Shin-Hung
崔燕勇
Tsui, Yeng-Yung
機械工程學系
關鍵字: 流固耦合;壓電致動器;壓電;微幫浦;計算流體力學;計算力學;有限體積法;FSI;PZT;micropump;CFD;ANSYS;FVM
公開日期: 2009
摘要: 本文為研究雙壓電致動器幫浦之流固耦合分析,將ANSYS軟體與CFD程式結合來分析此幫浦特性,利用ANSYS來計算固體力學部份,而CFD程式則負責計算流體力學之部分。在耦合計算時,將幫浦內的流體壓力和流體剪力視為固體力學之外力限制條件;將壓電振動平板之位移視為流體之牆邊界條件,來完成ANSYS軟體和CFD程式的結合。結果發現幫浦之流量同時受到電壓、擺動振幅和振動頻率影響,且觀察出欲增加幫浦流量的最好之方法為增加電壓的大小。同時發現將壓電振動平板放置於流體中並且受電壓之負載時,其共振頻率將會有明顯的下降。 本文同時利用ANSYS之調和分析來計算此壓電致動器幫浦在不同外部負載頻率下的振幅大小,並與ANSYS結合CFD的結果做比較,得到非常接近的結果,因此可證明ANSYS與CFD程式的結合計算方法具有相當程度的可信度。而本程式之優點為耦合時可以分析流場情況,例如:速度場、流線、壓力場,但ANSYS之調和分析無法分析流場的狀況,只能探討壓電振動平板受電壓後於水中之振幅反應。
This thesis is mainly aimed the calculation of the flow in oscillatory flow pumps using bimorph piezoelectric actuators, combining ANSYS finite element software with CFD program in order to solve Fluid-Structure interaction(FSI) problems. For computational simulations of the piezoelectric pump, the ANSYS is used; for computational simulations of the flow field, the CFD program is used. The result showed that flow rate of the flow pump is deeply affected by voltage, amplitude and frequency. In order to increase the flow rate of flow pumps is applied more high voltage. The resonance frequency of piezoelectric actuators is decreasing clear by setting piezoelectric actuators in fluids. The amplitude of the piezoelectric actuator of this thesis had been compared with the calculation of ANSYS harmonic analysis, and we received good result. This coupled method can analysis the vector field, streamline, pressure of flow field, but ANSYS harmonic analysis can’t.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079714565
http://hdl.handle.net/11536/44721
Appears in Collections:Thesis


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