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擴焰板對噴流擴散火焰效應之研究

A Study on Impinging Diffusion Flame with Splash Plate

指導教授 : 蘇艾
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摘要


擴焰板對噴流擴散火焰效應之研究 學生:蔡孟原 指導教授:蘇 艾博士 私立元智大學機械工程研究所 摘 要 本實驗主要在研究不同動量比及雷諾數條件下,利用不同擴焰板型態及調配擴焰板與噴嘴不同相對位置等參數,提昇單相及相向噴流火焰燃燒效率之研究。本實驗在兩個夾角為72.5度之噴嘴中間安裝一組擴焰板,提供噴嘴之氣體一為甲烷(CH4),另一個為空氣,藉由噴嘴氣體供給量變化去調整不同動量比及雷諾數之條件,利用K-type熱電偶去量測火焰溫度,以便了解不同條件下火焰溫度場之變化,在藉由溫度變化之統計分析去判別改變參數對燃燒效率之影響。本實驗所使用之研究參數為maf為1及0.8,擴焰板型式選定為平面及斜面,燃料雷諾數選定為Refuel=225及Refuel=290。 經由實驗得知,在單相噴流火焰研究中,在固定燃料流量的情況下,發現斜面擴焰板較平面擴焰板對燃燒效益助益更大,斜面擴焰板與平面擴焰板比較,Refuel=225時Teff=7.1%,在Refuel=290時Teff=11.3%。在低燃料雷諾數時,擴焰板有較明顯之助焰效果,雷諾數Refuel=225與Refuel=290之條件下,平面擴散板機構時Teff=10.7%,斜面擴焰板機構時Teff=6.5%。 在相向噴流非同質火焰研究中,無擴焰板的情況下,相同燃料雷諾數條件下,空氣與甲烷動量比由1降至0.8時,Teff=7.63%。在相同動量比之情形下,將燃料雷諾數由Refuel=225提高至Refuel=290,速度場變強時Teff=7.3%。斜面擴焰板,藉由改變擴焰板與噴嘴相對位置來探討火焰溫度場變化,在相同雷諾數及相同動量比條件下,燃料雷諾數Refuel=225時,在噴流全擋比噴嘴半擋情況下比較Teff=-8.9%。但當燃料雷諾數提高至Refuel=290時,噴嘴全擋比噴嘴半擋情況下比較Teff=6.7%。在不同動量比之條件,當動量比由1降至0.8時,噴嘴半擋情形下Teff=6.7%,而在噴嘴全擋情形下Teff=8.3%。 基於實驗結果得知,對於擴焰板之型式,選擇斜面擴焰板比平面擴焰板對火焰溫度效益提昇較好,而在雷諾數之選擇方面,提高燃料及空氣雷諾數時也會提高火焰溫度效益,而將maf由1降至0.8也會提高火焰溫度效益。

並列摘要


A Study on Impinging diffusion Flame with Splash Plate Student:Meng-Yuan Tsai Advisors:Dr. Ay Su Institute of Mechanical Engineering Yuan-Ze University ABSTRACT The objective of this study is to enhance the combustion efficiency of the one-direction and reciprocal jet impinging flames by using different splash plates and regulating the locations of splash plates and nozzles at various momentum ratios and Reynolds numbers. To investigate the combustion efficiency, a splash plate was installed between two nozzles (72.5o included angle). Air and methane were supplied form two nozzles for adjusting operational conditions. A K-type thermal couple was employed to measure the temperature profiles of the flames. In this study, a plane and an incline splash plates were employed. The momentum ratios between methane and air were set to be 1 and 0.8, and the fuel of Reynolds numbers were set to be 225 and 290. The results show that the combustion efficiency increased by employing the incline splash plate with one-direction flames: Teff=7.1% at Refuel=225 and Teff=11.3% at Refuel=290. Splash plates also can enhance the flame at lower Reynolds numbers. The Teff= 10.7% by using the plant splash plate, and Teff=6.5% by using the incline splash plate at Refuel =225 than these at Refuel =290. At heterogenous jet impinging diffusion flame conditions, the Teff= 7.63% without the splash plate when the air/methane momentum ratios decreased from 1 to 0.8. The Teff=7.3% when the fuel of Reynolds number increased from 225 to 290 due to the enhancement of the velocity field. At Refuel =225 with an incline splash plate, the Teff= -8.9% when nozzles were fully-blocked than half-blocked at the same momentum ratio. In contrary, the Teff= 6.7% at Refuel =290. When the momentum ratios decreased from 1 to 0.8, the Refuel =6.7% when nozzles were half -blocked and Teff =8.3% when nozzles werefully-blocked. In conclusions, to enhance temperature-effective, employing the incline splash plate is better than the plane one. Higher Reynolds numbers and lower momentum ratios also can increase the Teff value.

參考文獻


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被引用紀錄


謝明濬(2005)。提昇衝擊擴散火焰燃燒效率與節能機制之探討〔碩士論文,元智大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0009-0112200611361500

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