查詢結果分析
相關文獻
- 未限制渦旋尾流流場之不穩定性結構
- 高速液體噴流不穩定表面波成長對霧化之影響
- Capture Envelope of a Hood Opening under Crosswind Condition--A Numerical Approach
- Frequency of Unsteady Motions in Wake of a Wing
- Nonparallel Instabilities of a Supersonic Mixing Layer
- 不穩定波對翼形轉移點之數值研究
- 3D Instabilities of Compressible Mixing Layers
- On the Axial Length of the Recirculation Zone Behind a Circular Disc
- 高階孤立子穩定性之試驗研究
- 鈍體燃燒器冷態流場之研究
頁籤選單縮合
題名 | 未限制渦旋尾流流場之不穩定性結構=Instable Flow Structure of the Unconfined Swirling Wakes |
---|---|
作者 | 蔡豐欽; 毛世威; | 書刊名 | 黃埔學報 |
卷期 | 49 民94.10 |
頁次 | 頁117-124 |
分類號 | 447.5532 |
關鍵詞 | 鈍體; 不穩定波; 渦旋流逸; Bluff body; Instability wave; Vortex shedding; |
語文 | 中文(Chinese) |
中文摘要 | 本文主要針對旋流流體通過鈍體所形成之不穩定流場結構作作量測及分析。旋流流體通過鈍體會在鈍體後方形成一迴流泡,隨著旋流數的增加,流場會出現不穩定的流動結構。在圓盤周緣所衍生之剪流層在低雷諾數下所形成渦旋流逸利用熱線測速儀量測剪流層流場所得之頻譜關係具有不穩定波、層流波、次臨界波三種模態。在較大旋流數時,流場下游會形成渦旋回流,渦旋回流內渦流之頻譜關係具有層流波模態。此回流之渦流隨旋流數之增加而往上游移動,最後渦流會抵觸尾流區而破碎,形成不穩定之渦旋流逸,此時其頻譜關係具有次臨界波模態。 |
英文摘要 | This study is aimed at the measurement and analysis of the unstable flow structure on the unconfined swirling wake. Recirculation bubble forms near the wake while the swirling fluids pass through the bluff body. The flow structure appears to be unstable as the swirl strength increases. The vortex shedding found on the shear layer derived from the disc edge can be measured by the hot-wire anemometer. The spectrum relation shows the three modes: instability wave, laminar wave and subscritical wave. At the larger swirl strength, the vortex breakdown emerges downstream and shows the laminar wave mode inside its bubble. The bubble flows upstream upon the promotion of swirl strength and attach the top of the wake. The structure of the wake will be broken and become to be unstable vortex shedding, it shows the subscritical wave mode. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。