頁籤選單縮合
題 名 | Dynamics of an Elliptic Jet under Acoustic Excitation=橢圓噴流動態特性分析 |
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作 者 | 林源堂; 張益林; 劉彥邦; | 書刊名 | 中國機械工程學刊 |
卷 期 | 18:6 1997.12[民86.12] |
頁 次 | 頁599-603 |
分類號 | 440.137 |
關鍵詞 | 橢圓噴流; 動態特性分析; Elliptic jet; Axis-switching; Major-axis plane; Minoraxis plane; |
語 文 | 英文(English) |
英文摘要 | 本文探討橢圓噴流在基本頻率與次諧和頻率之聲波激發下的動態特性。實驗結果 顯示短軸方向剪力層擴張速率大於長軸方向剪力層之擴張速率,以至於在下游某處會發生軸 轉換現象,而聲波激發會使軸轉換現象提早發生。基本不穩定模態誘導滑流形成使剪力層之 流場結構化,而次諧和不穩定模態加強短軸方向剪力層之渦流配對使更有效傳遞動量。 layer along the minor axis is faster than those along the major axis. The axis-switching of jet under acoustic excitations occurs earlier than a jet without excitation. Flow visualizations reveal that the fndamental instability mode evolvte significantly in the upstream which induces the vortex formation and resulted in well organized flow structure. The subharmonic instability mode induces subharmonic resonance along the minor axis, it enhances vortex pairing, as a result, the momentum is transported effectively. |
本系統中英文摘要資訊取自各篇刊載內容。