本研究針對雙背吸式(DBS)排油煙機之靜態流場及檯前有假人站立對其性能的影響做實驗分析，探討流場與洩漏的特性。雙背吸式排油煙機擁有數個特徵結構：(1)主要狹縫型吸氣槽、(2)十二個橫狀排列輔助吸氣孔、(3)兩狹縫型吹氣槽、(4)兩面側板前方設計一三角形結構、(5)入口邊界層分離控制器。使用雷射輔助煙霧可視化技術，觀察排油煙機在不同火力與吸氣量搭配下流場的特性，推測洩漏原因和尋求最理想的操作參數。由於第(1)項特徵結構所處的位置設計，使絕大部分煙霧立即被排出，少部分因高溫浮力和紊流擾動而未被第(1)項特徵排出的煙霧，再由第(2)項特徵進行排出。由於排油煙機頂部第(3)、(4)、(5)項特徵結構的裝設，形成隔絕渦流，使極少部分未被第(2)項特徵排出的煙霧不易洩漏至外界。流場可視化結果顯示，當瓦斯流量Qfuel = 1.8、2.2、2.5 LPM (瓦斯爐燃燒熱功率qcomb = 3.4、4.2、4.7 kW)時，排油煙機在靜態無人的吸氣量Qs ≥ 8.64、8.64、9.36 m3/min，在動態真人炒菜的吸氣量Qs ≥ 9.36、9.36、10.08 m3/min，即完全無觀察到煙霧洩漏。但是，若吸氣量Qs小於額定值時，可觀察到煙霧由頂板前方洩漏至外界。SF6追蹤氣體測試結果顯示：當吸氣量大於等於額定值時，在排油煙機開口面所測得的SF6時間平均洩漏濃度Cave ≤ 0.004 ppm，瞬間洩漏濃度Cmax ≤ 0.007 ppm，幾乎達到零洩漏的程度。假人站立於鍋前的追蹤氣體測試結果顯示，雙背吸式排油煙機效能不會受假人站立時的鈍體效應影響而使油煙逸散出來。相較於傳統排油煙機，雙背吸式排油煙機有較佳之排出煙霧能力。

The flow patterns and leakage levels of a dual back-suction range hood (DBS range hood) were studied experimentally. The DBS range hood consisted of five featured structures: (1) a suction slot near the pots, (2) twelve suction holes at high level, (3) two slot jets, (4) two small triangular plates on the upper left and right corners of the hood face, (5) inlet boundary-layer separation controllers (BSC). Laser light-sheet assisted smoke flow visualization method was used to examine the flow patterns. Due to the locations of structures (1) and (2), most of the oil mist was attracted and exhausted outdoors. Due to the arrangement of the structures (3), (4), and (5), outward leakage from structure (2) was isolated. At the propane fuel flow rate Qfuel = 1.8, 2.2, and 2.5 LPM (corresponding to the Combustion Heating Power qcomb = 3.4, 4.2, and 4.7 kW, respectively), no oil-mist leakage was observed at the suction flow rate Qs ≥ 8.64、8.64、9.36 m3/min, respectively. The tracer-gas (SF6) detection experimental results corresponding to the aforementioned flow conditions revealed that the time-averaged and instantaneous leakage concentrations were Cave ≤ 0.004 and Cinst ≤ 0.007 ppm, respectively. The mannequin standing in front of the hood did not show any substantial negative effect on the hood flow patterns and leakage levels. The DBS range hood apparently presented a containment performance higher than the conventional hoods.

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