臺灣博碩士論文加值系統

本文藉由CFD模擬在公路隧道中行進汽車對周圍氣流的影響，因活塞效應而引起隧道中氣流流速的改變。模擬中所設置在隧道旁的採樣點與實際隧道的採樣點做對照，確認實際採樣點的數據代表性；模擬中採樣點的氣流速度因不斷經過的車輛影響而呈現弦波震盪，且車體遠離後仍因活塞效應而有速度表現；隧道中間點的流速不會因為相同的行車方向而增加，卻是因為壓力的平衡累積致使壓力增大因而流速變慢。並在與實際採樣點的數據比較下，兩者平均速度分佈皆在0~5m/s之間，故實際量測點的數據具參考性。

This paper investigated the flow field of moving car in tunnel and the effect due to the piston-effect by CFD. Compare the simulation sampling with real one to make sure the represention of velocity. We find the velocity of field is showing as sine wave because of car passing and there still has velocity of flow field owing to piston-effect through simulation. In the multiple conditions, the velocity of middle tunnel field become slowly because of the pressure balance rather than the same direction speed or the same piston effect. And compare with the data of actual sampling, the average velocity distribution of this two is between 0~5 m/s，so the data of the actual measurement is worthful as references.

致謝 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 緒論 1
1.1前言 1
1.2參考文獻 2
1.3研究目的與方法 6
第二章 模擬程序 7
2.1模擬模型建立 7
2.1.1隧道模型 7
2.1.2流體區網格模型 8
2.2數學模式 9
2.2.1連續方程式 9
2.2.2紊流模式 9
2.3動態網格 11
2.4假設 13
2.5邊界條件與起始條件設定 14
2.6網格數分析 17
第三章 模擬結果與討論 20
3.1單一車道流場分析 20
3.1.1單一車輛經過的流場變化 20
3.1.2兩輛車輛經過的流場變化 28
3.1.3三輛車輛經過的流場變化 34
3.1.4單一車道流場變化的比較 41
3.2雙車道流場分析 41
3.2.1 Case 4車輛經過的流場變化 41
3.2.2 Case 5車輛經過的流場變化 44
3.2.3 Case 6車輛經過的流場變化 48
3.2.4 Case 7車輛經過的流場變化 52
3.3實際量測點數據比較 58
第四章 結論與未來研究 60
4.1 結論 60
4.2 未來研究 60
參考文獻 61

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