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TIRE-LII를 이용한 확산화염에서의 매연입자크기에 관한 연구
김규보(Gyubo Kim),이종호(Jongho Lee),정동수(Dongsoo Jeong),전충환(Chunghwan Jeon),장영준(Youngjune Chang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Recently there is taking a growing 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. Therefore, in this study, we report the results of 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 useful to get the information for spatial and temporal soot volume fraction and size. Especially, TIRE-LII is able to measure soot particle size that is decided to solve the decay rate ofa S(t1) and S(t2) at two detection times. In laminar ethylene diffusion burner, visual flame height is 4㎝ from burner tip and measurement points are height of 15, 20, 27.5, 30 ㎜ above burner tip along radial direction. As higher form burner tip, particle size was increased to HAB=20㎜, decreased from HAB=27.5㎜ to 30㎜. this results shown growth and extinction processes for soot particles formed by combustion.
윤민지(Minji Yoon),김규보(Gyubo Kim),조승완(Seungwan Cho),장영준(Youngjune Chang),전충환(Chunghwan Jeon) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Recently, diesel vehicles have been increased and their emission standards have been getting strict. The emission of diesel vehicles contains numerous dangerous compounds, especially particulate matters cause a serious environmental pollutant and affect to human health seriously. Thousands of studies have already reported that particulate matters are associated with respiratory and cardiovascular diseases, and death. Due to these, it is necessary to measure the soot concentration and soot particle size in laboratory flames or practical engines to recognize the soot formation, and develop the control strategies for soot emission. In this study, the characteristics of exhausted soot particle size and volume fraction from 2.0L CRDI diesel engine have been investigated as varying engine speed and load. Laser induced incandescence has been used to measure soot concentration. Time-resolved laser induced incandescence has been used to determine soot particle size in the engine. The soot volume fraction is increased as increasing engine load but soot volume fraction is decreased as increasing engine speed. The primary particle size is distributed about 35nm 60nm at each experimental condition.
수소 예혼합 가솔린 직분사 엔진의 연소특성에 관한 수치해석 연구
배재옥(Jaeok Bae),최민수(Minsu Choi),서현욱(Hyunuk Suh),김규보(Gyubo Kim),전충환(Chunghwan Jeon) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The objective of this study is to improve fuel consumption and to decrease COx emissions by reducing amount of injected gasoline as a result of hydrogen addition during intake period of GDI engine that is available to lean burn. Amount of carbon mole in cylinder before combustion gets lower because of reducing amount of gasoline injection, thus it can reduce COx emissions generated after burning. Also, production by hydrogen addition is H₂O which is no harmful to the environment. amount of injected gasoline fitted by hydrogen fraction to addition, oxigen and nitrogen fraction, density and fixed equivalent ratio were decided by a little bit complexed calculation. Ignition delay is shortend and production of Soot and CO₂ is decreased in accordance with increasing of hydrogen addition. On the other hand, amount of NO production tends to accelate because of increasing max temperature except for cases of hydrogen percent 11%, 15%.