本研究以流體力學的觀點，針對氣動力氣罩的流場與性能作實驗分析。使用雷射流場可視化技術，觀察氣罩入口以及氣罩內部的流動型態；使用追蹤氣體濃度測試法，量測氣罩的洩漏濃度。氣動力氣罩包含四項重要設計：(1)一條狹縫式吸氣槽於靠近後牆處、(2)半圓柱於氣罩上方入口處、(3)兩片具有邊界層分離控制功能的板狀物(BSC)於兩側入口、(4)兩片三角形的角落渦流邊界層分離控制板(corner BSC)於上方氣罩與兩邊側板的交接處。經由雷射煙霧流場可視化技術，觀察到第(1)項設計使得被吸入氣罩入口的氣流可以將汙染物快速地往後上方輸送；第(2)項設計使得從氣罩上方被吸入氣罩之氣流分離時，分離點可以延後，且分離泡尺寸較小，可以降低迴流形成的汙染物洩漏機會；第(3)項設計使得氣罩兩側板入口處的分離點延後到BSC尾端，可以大為降低汙染物洩漏的危險性；第(4)項設計使得在上方氣罩與兩邊側板交接處的三維氣流所形成的洩漏危機大為降低。追蹤氣體濃度偵測法所量測到的結果顯示，沒有假人以及有假人立於氣罩前方時的靜態局部濃度洩漏測試，在吸氣速度Vs  6 m/s時，平均洩漏濃度均小於0.005 ppm，幾近可以忽略的低洩漏值。當吸氣速度Vs = 6 m/s (Qs = 5.0 m3/min)時，壓損為88 Pa，所需的流功非常的小，只有7.4 Watt。

Experimental analysis was conducted in the present research to study the flow and leakage characteristics of a specially designed desk-top fume hood. The hood was designed to reduce the negative effect of containment spillage induced by the boundary-layer separation of flow, which was commonly observed in the aerodynamic phenomena. The design features of the hood include (1) an rearward-offset elongate suction slot at the ceiling, (2) an half-circle flange at the inlet of the hood, (3) two side guard plates, their leading edges were arranged with boundary-layer separation controllers (BSC), (4) two triangular platelets installed at the junctions of the hood and two guard plates. The laser-light-sheet smoke flow visualization technique and tracer-gas (SF6) concentration detection method were employed to characterize the properties of the hood. The results of flow visualization showed that the rearward-offset elongate suction slot enable the flow drawn from the front area of the hood to be inclined rearward when the flow goes toward the suction flow. The half-circle flange at the inlet of the hood and the BSCs at the leading edges of the guard plates effectively postponed the boundary-layer separation of the flow into the hood and away from the inlet of the hood. The postponement of the boundary-layer separation point is beneficial to reducing the leakage levels of containments due to the reverse and vortical flows induced by boundary-layer separation at the inlet. The triangular platelets presented effects of reducing the containment leakage induced by three-dimensional turbulent flow structure around the juncture of the hood and the guard plates. The results of tracer-gas concentration measurements showed that the aerodynamically improved desk-top fume hood operated at a suction velocity of 6 m/s present almost null leakage levels (< 0.005 ppm) for both the unoccupied and occupied tests. Operating the hood at a higher suction velocity would increase its robustness. The flow rate, pressure drop, and flow work corresponding to 6 m/s of suction velocity were 5.0 m3/min, 88 Pa, and 7.4 Watt, respectively, which were relatively smaller than the conventionally used chemical fume hoods.

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