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題 名 | 脈動流流經MEMS熱膜邊界層之非定常數值研究=Numerical Studies of the Unsteady Flowfield over a MEMS Thermal Film Boundary in Pulsatile Flow |
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作 者 | 徐子圭; 苗君易; | 書刊名 | 航空太空及民航學刊. 系列B |
卷 期 | 40:2 2008.10[民97.10] |
頁 次 | 頁77-84 |
分類號 | 440.12 |
關鍵詞 | MEMS熱膜感測器; 脈動流; 渦流逸放; 邊界層交互作用; MEMS thermal film; Pulsatile flow; Vortex shedding; Boundary interaction; |
語 文 | 中文(Chinese) |
中文摘要 | MEMS熱膜感測器常用於量測流場流速或剪力特性,但於高頻脈動流場常發生訊號遲滯現象,本研究以CFD計算流力之方法探討MEMS熱膜邊界層流於不同頻率脈動入口流下之交互作用特性,於數值方法採用有限體法預調式密度基算則,配合溫度回饋修正MEMS發熱點程式,成功解算此一複雜流場特性。研究結果發現:在無熱源之條件下,脈動流於減速變速階段於平板邊界層會發生渦流逸放現象;於熱源條件下,熱邊界層與流場邊界層發生交互作用,溢放之渦流會因熱對流效應及脈動流之影響下造成訊號遲滯現象,此一數據可提供實驗研究作爲量測限制之參考依據。 |
英文摘要 | MEMS thermal film is usually using to measure flowfield velocity and shear stress, but the signal delay is occurred in high frequency pulsatitle flow. This paper was using the CFD (Computational Fluid Dynamics) to investigate the interaction of the MEMS thermal film boundary under different frequency pulsatile inflow. The numerical method was finite volume preconditioning density-based algorithm, and feedback adaptive heat source scheme. It was successfully to simulate this complex flowfiels. The result shows that the vortex shedding was occurred when the pulsatile inflow without heat source state from slow down into acceleration process. The thermo-boundary and flow boundary were interactive with heat source state. The measurement signal is delay by the interaction of the conduction and pulsatile flow in vortex shedding. This research can offer reference basis limited to the experimental measurement. |
本系統中英文摘要資訊取自各篇刊載內容。