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직분식 CNG 엔진에서 연료 분사시기의 변화가 연소 및 출력 특성에 미치는 영향
강정호(Jeongho Kang),윤수한(Soohan Yoon),이중순(Joongsoon Lee),박종상(Jongsang Park),하종률(Jongyul Ha) 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.1
Natural gas is one of the most promising alternatives to gasoline and diesel fuels because of its lower harmful emissions, including CO², and high thermal efficiency. In particular, natural gas is seen as an alternative fuel for heavy-duty Diesel Engines because of the lower resulting emissions of PM, CO² and NOx. Almost all CNG vehicles use the PFI-type Engine. However, PFI-type CNG Engines have a lower brake horse power, because of reduced volumetric efficiency and lower burning speed. This is a result of gaseous charge and the time losses increase as compared with the DI-type. This study was conducted to investigate the effect of injection conditions (early injection mode, late injection mode) on the combustion phenomena and performances in the DI CNG Engine. A DI Diesel Engine with the same specifications used in a previous study was modified to a DI CNG Engine, and injection pressure was constantly kept at 60bar by a two-stage pressure-reducing type regulator. In this study, excess air ratios were varied from 1.0 to the lean limit, at the load conditions 50% throttle open rate and 1700rpm. The combustion characteristics of the DI CNG Engine - such as in-cylinder pressure, indicated thermal efficiency, cycle-by-cycle variation, combustion duration and emissions - were investigated. Through this method, it was possible to verify that the combustion duration, the lean limit and the emissions were improved by control of injection timing and the stratified mixture conditions. And combustion duration is affected by not only excess air ratio, injection timing and position of piston but gas flow condition.
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김진영,노태정,윤수한 동명정보대학교 2000 東明情報大學校論文集 Vol.3 No.-
X-ray technology is a good solution for inspecting inner defects of industrial products. In case of conventional x-ray radiography images, however, it is very difficult to correctly recognize the internal shape of objects, because all objects on the projection line are overlapped in the images. On the other hand, x-ray cross-sectional imaging systems forming an arbitrary cross-section image of a 3D object make it easy to inspect the inner shape or structure of it. PCB solder joint inspection is one of the industrial fields which need such an x-ray inspection system. In this paper, a newly developed DT system is introduced, and the x-ray cross-sectional images of PCB solder joints is acquired from this proposed system.
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