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고압 분사 디젤 인젝터의 노즐 형상이 분사 특성 및 분무 거동에 미치는 영향
이창식 ( C. S. Lee ),박성욱 ( S. W. Park ),전문수 ( M. S. Chon ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.1
N/A This paper describes the characteristics of injection rate and macroscopic behavior of fuel spray injected from common-rail type diesel injectors with different nozzle geometries. The injection rates according to the nozzle geometries were measured at different energizing duration of the injector solenoid and injection pressure by using the Bosch`s injection rate meter based on the pressure variation in the tube. The spray behaviors injected from the different nozzles were visualized using the spray visualization system composed of an Ar-ion laser, an ICCD camera, and a synchronization system at various injection and ambient pressures. It is revealed that VCO nozzle has higher spray tip velocity at the early stage of injection duration and wider spray cone angle than the mini-sac nozzles. Also the spray cone angle is increased with the increase of nozzle diameter.
졸 - 겔법에 의한 헥사알루미네이트의 제조 및 연소특성
백영순,박성욱,김형진,문세기 ( Y . S . Baek,S . W . Park,H . J . Kim,S . K . Moon ) 한국공업화학회 1995 공업화학 Vol.6 No.6
금속 알콕사이드법에 의해 복합 알콕사이드를 합성하고, sol-gel 법으로 가수분해 반응시켜 얻은 전구체를 소성하여 내열성 바륨 헥사알루미네이트 담체를 만들었다. 복합 알콕사이드 합성시 알코올의 종류 및 양, 반응시간을 변화시켜 barium hexaaluminate 전구체물성에 미치는 영향을 관찰하였으며, 이 담체에 활성 물질인 전이금속(Mn, La)을 치환시켜 BaMnAl_(11)O_(19)과 Sr_(0.8)La_(0.2)MnAl_(11)O_(19) 촉매를 만들었다. 담체의 비표면적은 소성온도 1300℃에서 약 24㎡/g의 높은 값을 나타냈으며, 메탄 연소에 대한 활성화 에너지는 BaMnAl_(11)O_(19) 촉매의 경우 약 11㎉/mole, Sr_(0.8)La_(0.2)MnAl_(11)O_(19) 촉매의 경우 약 9㎉/mole을 나타냈다. 이를 사용하여 중·고온용 연소기의 운전범위에서 공간속도와 공연비를 변화시키면서 메탄 연소특성을 수행하였다. Complex alkoxides were synthesized using metal alkoxide method and were then hydrolyzed to make the precursors using sol-gel method. Factors such as kinds and amounts of alcohols and reaction time which govern the material properties of the barium hexaaluminate precursors were studied. The heat resistant barium hexaaluminate were prepared after the calcination of the precursors. BaMnAl_(11)O_(19) and Sr_(0.8)La_(0.2)MnAl_(11)O_(19) catalysts were finally yielded by the introduction of active transition metals (Mn, La) into the metals(Ba, Sr) hexaaluminate by substitution. The surface area of the hexaaluminate support was about 24㎡/g at 1300℃ and the activation energy for methane combustion was 11㎉/㏖ for BaMnAl_(11)O_(19) and 9㎉/㏖ for Sr_(0.8)La_(0.2)MnAl_(11)O_(19). Based on these catalysts, the characteristics of methane combustion were studied as functions of space velocity and air/fuel ratios in the operational range of mid/high temperature combustors.