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이상석(Lee S S),김근민(Kim K M),김봉곤(Kim B G),정성식(Jung S S),하종률(Ha J Y) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
In this study. to more percisely and systematically analyze the process of combustion of the impinging spray. Helium spray was impinged on the 3 types of piston cavity geometry into the quiescent atmosphere with a room temperature and pressure to simplify the state of the real combustion chamber and hot wire probe was used for analyze non-steady flow characteristics of impinging spray. and ensemble average technique method was used for data process. and consequently re-entrant type has larger entrainment then others and vortex appear at the sperical region.<br/>
비정상 충돌 분류의 Cavity 형상에 따른 공간 농도 분포 및 거동해석
이상석,김근민,김봉곤,정성식,하종률 한국액체미립화학회 1996 한국액체미립화학회지 Vol.1 No.2
In case of a high-speed D.I. diesel engine, the injected fuel spray is unavoidable that the impinging on the wall of piston cavity and in this case the geometry of piston cavity has a great influence on the atomization structure and air flow fields. In the field of combustion and in many other spray applications, there are clear evidence of correlation between spray structure and emission of pollutants. Ordinary, the combustion chamber of driving engine have unsteady turbulent flow be attendant on such as the change of temperature, velocity and pressure. So the analysis of spray behavior is difficult. In this study, a single spray was impinged on each cavity wall at indicated angle in a quiescent atmosphere at room temperature and pressure, as being the simplest case, and 3 types of piston cavity such as Dish, Toroidal and Re-entrant type was tested for analyzing the influence of cavity geometry. And hog wire probe was used for analyze non-steady flow characteristics of impinging spray, and to investigate the behavior of spray, the aspects of concentration c(t), standard deviation σ (t) and variation factor (v.f.) was measured with the lapse of time.