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題名 | 因凸起結構物所產生流場型態之研析 |
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作者 | 柯亭帆; | 書刊名 | 技術學刊 |
卷期 | 9:2 1994.06[民83.06] |
頁次 | 頁127-133 |
分類號 | 440.137 |
關鍵詞 | 凸起結構物; 流場分離; 迴流; 有限元素; 電腦模擬; Convex structure; Flow separation; Recirculation; Finite element; Computer simulation; |
語文 | 中文(Chinese) |
中文摘要 | 在限制範圍的流域裏,由於凸起結構物之影響,流場將會有分離而產生迴流的現象,本文即透過電腦模擬來分析厚度為細與方形之障礙物對此類流場的特性差別。所探討的物理變量包含流線、渦流、再觸長度、以及沿壁剪應力。從一系列不同流體特性作用下所分析的結果,可顯示出迴流的強度與再觸長度均與雷諾數成正比,並且厚度較細的凸起結構物會形成較大的強度。另外,從結果顯示沿上壁之剪應力,其正尖峰值是發生在流域幾何形狀剛要變化的鄰近位置;而沿下壁之剪應力,其負尖峰值是發生在凸起結構物後面迴流的區域,並且隨著雷諾數之增加而漸行離遠該結構物。 |
英文摘要 | In a confined flow domain, due to the effect of a convex structure, the flow will separate and form a major eddy behind the obstruction. This paper is aimed to deal with the difference of flow fields for thin and square structure by using computer simulation. Four physical parameters including streamline, vorticity, reattachment length, and shear stress along the walls are investigated for various Reynolds numbers. It is observed that the recirculating zone and the reattachment length gradually increased in sizes with increasing Reynolds numbers for both thin and square structure, and the thin structure seemed to have a more stronger influence on this flow case. In addition, the results revealed that the positive peak shear stress along the upper wall occurred at the location where the geometry suddenly changed; the negative peak shear stress along the lower wall occurred at the recirculating area and traveled farther from the obstruction as Reynolds number is increased. |
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