淡江大學機構典藏:Item 987654321/38288
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    題名: 模型隧道內車行活塞效應及風扇效應之探討
    其他題名: Investigations of Piston-Effect and Jet Fan-Effect in Vehicle Model Tunnels
    作者: 陳增源;Chen, T. Y.;李彥德;Lee, Y. T.;許中杰;Hsu, Chung-Chieh
    貢獻者: 淡江大學航空太空工程學系
    關鍵詞: 隧道;活塞效應;風扇效應;Tunnel;Piston Effect;Fan Effect
    日期: 1996-11
    上傳時間: 2010-01-11 15:02:07 (UTC+8)
    出版者: 台灣大學工學院
    摘要: 本研究利用旋轉皮帶帶動模型車輛之方式,探討模型隧道中,車行及風扇對隧道通風之效應;尤其探討車行所造成隧道內之空氣動力分布及風扇對汽車廢氣分布之影響。研究結果顯示,車速、車距、車子大小等對隧道內車行造成之流場分布影響很小;同時,車速在車行活塞效應中,扮演著較重要之角色。車行活塞效應並非僅局限在車子附近,在隧道頂部之區域,其活塞效應亦達車子附近之40%。雙向行車之活塞效應仍存在於個別車道上,但僅為單向行車活塞效應之35%。隧道內車行造成之平均風速與車行有很大之關聯;在正常行車狀況下,其平均風速與車速之比值接近1/3,而在其他測試條件下,皆小於1/3。風扇效應之研究結果顯示,較高風速之風扇雖然造成隧道內較大之風速,但是將造成汽車之廢氣較局限在隧道底部,不利駕駛者。
    This research is concerned with the experimental studies of the effects of moving vehicles (piston-effect) and jet fans (jet fan-effect) on the tunnel ventilation in rotating-belt vehicle model tunnels. Specifically, the aerodynamics of the flow induced by moving vehicles and effects of jet fans on the distribution of vehicle exhausts were investigated under different traffic conditions. Results of these studies show that distributions of flow velocities inside the tunnel induced by moving vehicles weakly depend upon the vehicle speed, vehicle spacing and vehicle size. In addition, the vehicle speed plays more important role than the vehicle spacing and vehicle size in the piston-effect inside the tunnel. The results also show that the piston-effect in a tunnel is not confined in the vicinity of vehicles. In general, the piston-effect in the top region of the tunnel is 40% of that around the vehicle. Furthermore, there still exists piston-effect in each lane of a two-way traffic tunnel and, however, it is only 35% of that in a one-way traffic tunnel. The mean flow velocities induced by the moving vehicles are largely dependent upon the traffic conditions. The ratio of the mean flow velocity to the vehicle speed, V/U, is close to 1/3 for a normal traffic condition, and mostly are smaller than 1/3 for other traffic conditions conducted in this research. Results of the jet fan-effect study show that larger fan velocity results in higher exhaust concentration in the lower region of the tunnel, though it causes higher flow velocity inside the tunnel, which would be harmful to drivers.
    This research is concerned with the experimental studies of the effects of moving vehicles (piston-effect) and jet fans (jet fan-effect) on the tunnel ventilation in rotating-belt vehicle model tunnels. Specifically, the aerodynamics of the flow induced by moving vehicles and effects of jet fans on the distribution of vehicle exhausts were investigated under different traffic conditions. Results of these studies show that distributions of flow velocities inside the tunnel induced by moving vehicles weakly depend upon the vehicle speed, vehicle spacing and vehicle size. In addition, the vehicle speed plays more important role than the vehicle spacing and vehicle size in the piston-effect inside the tunnel. The results also show that the piston-effect in a tunnel is not confined in the vicinity of vehicles. In general, the piston-effect in the top region of the tunnel is 40% of that around the vehicle. Furthermore, there still exists piston-effect in each lane of a two-way traffic tunnel and, however, it is only 35% of that in a one-way traffic tunnel. The mean flow velocities induced by the moving vehicles are largely dependent upon the traffic conditions. The ratio of the mean flow velocity to the vehicle speed, V/U, is close to 1/3 for a normal traffic condition, and mostly are smaller than 1/3 for other traffic conditions conducted in this research. Results of the jet fan-effect study show that larger fan velocity results in higher exhaust concentration in the lower region of the tunnel, though it causes higher flow velocity inside the tunnel, which would be harmful to drivers.
    關聯: 中國機械工程學會第十三屆全國學術研討會論文集 (流力)=Proceedings of the Thirteen National Conference of the Chinese Society of Mechanical Engineers，頁165-172
    顯示於類別:[航空太空工程學系暨研究所] 會議論文

    文件中的檔案:

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    模型隧道內車行活塞效應及風扇效應之探討 _英文摘要.docx摘要16KbMicrosoft Word176檢視/開啟
    模型隧道內車行活塞效應及風扇效應之探討_中文摘要.docx摘要14KbMicrosoft Word244檢視/開啟

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