本研究針對斜氣簾式排氣櫃進行流場特性以及追蹤氣體洩漏濃度的探討。使用雷射輔助煙霧流場可視化技術，觀察氣流進入櫃體入口以及櫃內時的流場型態，以了解邊界層分離的控制機制以及櫃內氣流的物理結構。使用追蹤氣體濃度偵測法評估排氣櫃在假人立於櫃前(ANSI/ASHRAE 110-1995)以及靜態(內部量測面)、櫃門開關(外部量測面)以及人行經櫃前(強健度)測試(EN14175-3:2003)的洩漏特性。斜氣簾式排氣櫃包含四個重要設計。經由雷射輔助煙霧流場可視化技術，所觀察到的煙霧流場顯示，前面三項設計，使得櫃內氣流形成四個兩兩對轉之渦流；更由於前面兩項設計，使得這四個兩兩對轉之渦流被隔絕於往後傾斜氣簾之後方。由於渦流核心部分的壓力比外圍的壓力低，所以汙染物被吸入並限制於這四個兩兩對轉之渦流中，在上升之過程同時往後傾斜，最後經由狹長型吸氣槽排出室外。往後傾斜的四個渦流被隔絕於氣簾後方，可增加對外界干擾氣流之抵抗能力。第四項設計，可使汙染物外洩機率降低。使用追蹤氣體濃度偵測法量測的結果顯示，具有斜板形BSC的斜氣簾式排氣櫃在面速度0.26 m/s時，假人立於櫃前、靜態及櫃門開關測試洩漏平均值均在0.003 ppm以下。強健度測試下，在面速度0.26 與0.45 m/s時，洩漏平均值分別為0.328與0.003 ppm。顯示斜板形斜氣簾式排氣櫃在小擾動及小面速度下即有很低的洩漏值。

An inclined air-curtain (IAC) fume hood was characterized by using the laser-assisted smoke flow visualization technique and tracer-gas (sulphur hexafluoride) concentration detection method. Four innovatory designs were included in the IAC fume hood. Baffles used in the conventional hoods were not required. The suction slot and the up-blowing planar jet formed a rearward-inclined push-pull air curtain. The deflection plates worked with the inclined air curtain to induce four rearward-inclined counter-rotating “tornados.” The fumes generated in the hood were isolated behind the reward-inclined air curtain, entrained by the low-pressure within the vortical flows, went up spirally, and finally exhausted through the suction slot. The risk of containment leakage induced by the large recirculation vortex usually existed behind the sash of conventional hoods was reduced by the boundary-layer separation controller. The results of tracer-gas concentration detections based on the EN-14175 method showed that the flow field created by the geometric configurations of the IAC hood presented characteristics of low leakage and high potential of resisting dynamic disturbances at low face velocities. The leakage levels of the static, sash movement, and walk-by tests were negligibly small at the face velocity of 0.26 m/s. The results of tests based on the ANSI/ASHRAE method also showed negligibly small leakages (less than 0.004 ppm) even at a large sampling probe velocity of 2 m/s

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