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직접분사식 엔진의 분무특성에 미치는 스월의 영향 및 입경분포에 대한 수치해석적 연구
양회천(H.C.Yang),유홍선(H.S.Ryou),최영기(Y.K. Choi) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A numerical simulation of the spray characteristics in a direct injection engine was performed 10 study the effects of swirl on spray. This study used the finite volume method. the hybrid and Euler implicit scheme and the modified k-ε turbulence model. Also the spray model which considered breakup, collision and coalescence and evaporation of spray droplets was used.<br/> The calculation results of Sauter mean diameter(SMD) and droplet size distribution were compared with<br/> the experimental data(1-2] in a quiescent environment<br/> As the swirl ratio increased the evaporation rate was increased. due to the wide dispersion of spray<br/> droplets and the strong interaction between spray droplets and gas field.<br/>
홍기배(K. B. Hong),김형섭(H. S. Kim),양회천(H. C. Yang),유홍선(H. S. Ryou) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this study, the numerical simulations of the spray characteristics within the combustion chamber of direct injection model engine are performed to examine the applicability of turbulence model. The turbulence models used are the RNG k-t model and the modified k-ε model which included the compressibility effect due to the compression/expansion of the charges. The predicted results in the quiescent condition of direct injection model engine show reasonable trends comparing with the experimental data of spray characteristics, i .e., spray tip penetration, spray tip velocity. The spray tip penetration predicted using the RNG k-t model is