| Summary: | 碩士 === 元智大學 === 機械工程學系 === 93 === 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.
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