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題名 | Influence of Shear Flow and End Effects on the Wake of a Circular Cylinder=剪流與邊端效應對圓柱尾流之影響 |
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作者 | 魏欽益; 張政仁; 關岳威; | 書刊名 | 筧橋學報 |
卷期 | 5 1998.09[民87.09] |
頁次 | 頁55-76 |
分類號 | 447.55 |
關鍵詞 | 剪流; 邊端效應; 渦流溢效; Shear flow; End effect; Vortex shedding; |
語文 | 英文(English) |
中文摘要 | 本研究探討剪流之速度梯度及圓柱之邊端效應對尾流渦流溢放作用的影響。實驗 採長度與直徑之比漸進化之蜂巢網,利用蜂巢網所造成之摩擦阻力的差異來產生速度呈線性 變化之剪流。 兩組圓柱模型的長度與直徑比分別為 20 及 30。結果顯示,剪流的速度變化 對圓柱尾流的無因次速度分佈沒有顯著的影響;當剪流之無因次速度斜率(β)較大時,圓 柱下游之渦流溢放頻率呈擬似階梯狀變化;當β相對較小時,圓柱下游之渦流溢放頻率則呈 近似連續性之變化。圓柱兩側之邊端效應減弱了圓柱尾流的二維特性及其渦流溢放現象,其 主要的影響範圍約為六倍圓柱直徑。 |
英文摘要 | This study investigates the influence of upstream shear flow and end effects of the cylinder on the vortex shedding downstream of a circular cylinder. A honeycomb with varying length-to-diameter ratios generate shear flow with constant velocity gradient. Experimental models include two circular cylinders whose length-to-diameter ratios are 20 and 30, respectively. Experimental results show that the velocity difference of upstream shear flow does not significantly affect the nondimensional velocity distribution of the wake. The shedding frequencies downstream of the circular cylinder exhibit staircase-like distributions along the spanwise direction as the non-dimensional velocity gradient of the shear flow (β ) is large; otherwise, the shedding frequencies reveal near continuous variation as β is relatively small. The end effects on both sides of the cylinder suppress the vortex shedding at the spanwise distance about 6 times the diameter of the cylinder. The end effects also slightly decrease the characteristic frequency of the shedding vortices. |
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