四渦流排油煙櫃係用以改善傳統商用排油煙設備缺點的新設備，本研究探討評估一套全新的四渦流排油煙櫃於高溫熱源作用時之空氣動力特性以及汙染物洩漏的程度。使用雷射輔助煙霧可視化技術探討氣流於排煙櫃入口以及內部的流動型態。流場可視化的結果顯示，四渦流排油煙櫃利用廂型式氣罩特性，降低因側風影響而萎縮的補集區範圍；使用向後偏移的狹長型吸氣槽以增加有效吸氣距離；使用Inlet BSC的開口設計以緩和汙染物於開口邊緣迴流的程度；使用導流板配合狹長型吸氣槽以及Inlet BSC開口設計，進一步消彌油煙逆流滯留於開口邊緣的問題，並產生穩定後傾的四渦流流場，使流場更加穩健；利用下吹式氣簾產生隔離泡防止汙染物外洩，並與狹長型吸氣槽配合產生短路氣簾；利用渦流產生器產生隔離泡防止汙染物外洩
，並控制分離點向排油煙櫃櫃面內移動，而設置渦流產生器亦可增加面速度。在吸氣速度Vs ≧ 16 m/s時，櫃內流場呈現向後傾斜的渦流模態，油煙被吸入渦流的低壓區中，最終被吸入櫃頂的狹長型吸氣槽而排出室外。在極度高溫以及大的出熱量時，櫃頂會有洩漏的危機，但由於下吹噴流與狹縫吸氣的共同作用所形成的隔離泡的存在，大部分的油煙被下吹式氣簾阻擋，少部分的油煙被渦流產生器擋住，而不會外洩。傳統商用排油煙櫃之面速度要介於0.5到1.0 m/s，才有稍好的補集效率，頗為浪費能源而且油煙仍舊洩漏，而四渦流排油煙櫃之面速度僅需0.28 m/s (吸氣速度為16 m/s) ，即可達到優異的表現，亦能達到節省能源的目的。

A box-type quad-vortex commercial kitchen hood was developed and experimentally studied. The laser-light-sheet-assisted smoke flow visualization technique was used to investigate the characteristic flow motions near the hood inlet, around the boundaries, and inside the hood at high temperatures and various suction velocities. The quad-vortex commercial kitchen hood consisted of three important elements at the hood roof: (1) an elongate suction slot, (2) a down-blowing planar jet, and (3) a vortex generator. Two deflection plates were installed upright at the side walls. Boundary-layer separation controllers were arranged at the peripheral of the hood inlet. The smoke flow visualization results showed some findings. The most risky areas favoring for high-temperature containment leakage were the inlet of the hood roof due to the high-temperature and high-heat-release rate induced buoyancy and gas expansion effect. The elongate slot suction worked with the down-blowing planar jet to form a recirculation bubble which isolated the outward-expanding hot gas or oil fumes. The vortex generator induced another recirculation bubble for isolation of the hot gas and oil fumes for the extremely high-temperature and high-heat-release operations. The deflection plates stopped the reverse flows going along the side walls and assisted to for two corner vortices. These two corner vortices subsequently induced two large vortices around the hood central area. The vortices carried the hot gas and fumes, rose up spirally, inclined rearward (due to the Coanda effect and rearward-offset of suction slot), and exhausted through the suction slot. The boundary-layer separation controllers installed at the inlet of the side walls and roof reduced the size of the separation-induced recirculation bubbles, and therefore decreased the risk of hot gas and oil fume leakages. The detailed physical mechanisms of flow and leakages were discussed and supported by flow visualization pictures. The hood presented no observable spillages of oil fumes when the suction velocity and the down-blowing jet velocity were 16 m/s and 2.5 m/s, respective, under the operation conditions of pot temperature 550 ℃ and heat-release rate 30 kW.

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