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벽면충돌분무 계산에서 확장충돌모델의 적용범위에 관한 고찰
박권하,정창화,Park, Gwon-Ha,Jeong, Chang-Hwa 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.8
This paper addresses to the area where the extended collision model is applied. In order to find the optimum shape of wall sprays, the extended model is applied to the nearest cells of just over the impaction wall, spray core or over all. The droplet distribution, wall spray radii, heights and gas flows are shown in all the cases. Those results show that the best spray shape represents in the case applying the extended model just on the impinging wall.
박권하(K.Park),유경배(K.B.Yoo),박정규(J.K.Park),김재휘(C.W.Kim),김진환(J.W.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Circumstances require improving diesel engines, and many studies have done in constant volume chamber(CVC). However the combustion mechanism of a diesel engine has many difficulties with non-homogeneous nature, so those give a limitation to analyzing with CVC. The study is often given in real engine, but also it has a limitation due to hard modification. To get more easy way with more engine like test, a rapid compression machine has introduced.<br/> This study addresses to designing a rapid compression expansion machine(RCEM) driven by compressed air, and to applying it on IDI diesel combustion chamber.<br/> Firstly rapid machine is introduced and its characteristics are tested, then whole test apparatus for diesel combustion analysis is explained. The system is applied to analyze IDI combustion chamber which results are shown.<br/>
분사압력변화가 분무특성에 미치는 영향에 관한 수치적 고찰
박권하(K. Park) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.2
High injection pressure system has been developed as a measure to reduce harmful exhaust gases. In order to understand the effect of pressure on diesel spray injection process, wide range of high injection pressure was tested. The gas phase is modelled by the Eulerian continuum conservation equations of mass, momentum, energy and fuel vapour fraction. The liquid phase is modelled following the discrete droplet model approach in Lagrangian form.<br/> The droplet distributions, vapor fractions and gas flows arc analyzed in various injection pressure cases. The distributions of spray and vapor increase and the Sauter mean diameter decreases with increasing injection pressure quickly in a low pressure area but slowly in a high pressure area.