本研究針對四渦流排油煙機的流場與干擾氣流對其性能的影響作實驗分析，探討排油煙機在受干擾氣流於不同角度θ吹拂影響之下的流場特性與捕集性能。使用流場可視化法觀察不同干擾氣流吹拂速度Vd及角度θ變化之下對其流場的影響，進而分析流場型態。並利用雷射都普勒測速儀(LDV)量測其靜態時的內部流場，再以追蹤氣體(SF6)測試法量測其捕集效率ηave及捕集指標ξave，並與它款排油煙機的捕集性能作比較。實驗結果顯示，靜態時從流場可視化法觀察的結果與LDV量測出來的流場結構相互吻合。靜態時，當吸氣速度Vs ≥ 8 m/s，捕集效率ηave皆為~100%。受速度Vd ≤ 0.5 m/s的干擾氣流吹拂時，當吸氣速度Vs ≥ 8 m/s，捕集指標ξave皆為~100%。IQV排油煙機在抵禦干擾氣流吹拂時，吹拂角度θ為0o與90o時比45o時的捕集性能較高。當與其它排油煙機比較時，IQV排油煙機抵禦干擾氣流的能力高很多。受干擾氣流影響時，IQV排油煙機吸氣速度Vs為12 m/s時，已達極佳的捕集性能，且吸氣流量Qs只需8.6 m3/min，而傳統排油煙機吸氣流量Qs為15.0 m3/min時，捕集性能不及前者；除此之外，IQV排油煙機相較於傳統排油煙機的能量消耗節省了約47%。

A study is focused on the experimental analysis about the flow characteristics of inclined quad-vortex range hood and effects of draft on its performance. Laser light sheet-assisted smoke flow visualization is employed to qualitatively diagnose the flow patterns, which under effects of draft with different velocities and angles. Laser Doppler velocimetry (LDV) measurement is carried out to identify characteristics of flow structure. The tracer-gas (SF6) concentration method is applied to measure quantitative capture efficiency ηave and capture index ξave. The performances of IQV range hood are compared with those of conventional ones. The flow structures obtained by flow visualization method and laser Doppler velocimetry measurement correlate well. The capture efficiency of the IQV range hood operated at the suction velocity Vs ≥ 8 m/s attain ~100% when the hood is subject to the influence of a draft at the velocitiesVd ≤ 0.5 m/s. Theperformance of the IQV range hood under the influence of draft effects are significantly higher than those of IAC and conventional range hoods. Under the static condition, theIQV range hoodoperated at the suctionvelocity Vs= 12 m/s (Qs=8.6m3/min) presents almost 100% of capture efficiency. While thecapture efficiency of the conventionalrange hood operated at the flow rate Qs=10.5 m3/min is 99.01%.When subject to the influence of a draft Vd = 0.5 m/s, theIQV range hoodoperated at the suctionvelocity Vs= 12 m/s (Qs=8.6m3/min) still presents almost 100% of capture index.While thecapture index of the conventionalrange hood operated at the flow rate Qs=10.5 m3/min is 55.66% when subject to the influence of a draft Vd = 0.5 m/s.

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