Abstract
Keywords:
Soot particle size, Laser-induced incandescence, Ethylene diffusion flame, Decay rate, Time-resolved
Abstract
Recently there is an increasing interest in particulate matter emission because of new emission regulations, health awareness and environmental problems. It requires to improve particulate measurement techniques as well as to reduce soot emissions from combustion systems. As mentioned above, it is demanded that reduction techniques together with measurement techniques of exhausted particle matters in combustion systems such as vehicles. However, measurement techniques of particle matters should be prior to reduction techniques of that because it is able to know an increase and a decrease of exhausted particle matters when measured particle matters. Therefore, in this study, we report the measurement of soot particle size using time-resolved laser induced incandescence (TIRE-LII) technique in laminar ethylene diffusion flame. As an optical method, laser induced incandescence is one of well known methods to get information for spatial and temporal soot volume fraction and soot primary size. Furthermore, TIRE-LII is able to measure soot particle size that is decided to solve the decay rate of signal S (t1) and S (t2) at two detection time. In laminar ethylene diffusion burner, visual flame height is 40 mm from burner tip and measurement points are height of 15, 20, 27.5, 30 mm above burner tip along radial direction. As increasing the height of the flame from burner tip, particle size was increased to HAB=20mm, and then decreased from HAB=27.5 mm to 30 mm. This results show the growth and oxidation processes for soot particles formed by combustion.