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중공 원추형 연료 분무의 미립화 및 벽 충돌 과정에 대한 연구
심영삼(Youngsam Shim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.4
Numerical analysis about atomization and wall impingement process of hollow-cone fuel spray is performed by a modified KIVA code with hybrid model. The atomization process is modeled by using hybrid breakup model that is composed of Linearized Instability Sheet Atomization (LISA) model and Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model. The Gosman model, which is based on the droplet behaviors after impingement determined by experimental correlations, is used for spray-wall impingement process. The LIEF technique was used to compare the results with those of experiment. The calculations and experiments are carried out at the ambient pressures of 0.1 ㎫ and 0.5 ㎫ and the ambient temperature of 293K. It was found that the calculated results show satisfactory agreement with experimental ones.
GDI 엔진용 고압 스월 인젝터의 초기 및 주 분무에 대한 수치적 연구
심영삼(Youngsam Shim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The objective of this study is to analyze the pre spray and the main pray ofa high pressure swirl injector for GDI injector by using a hybrid breakup model. The hybrid breakup model is composed of Linearized Instability Sheet Atomization (LISA) model and Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model. The LISA model was used for primary breakup process and the APTAB model was used for secondary breakup process. The spray model was incorporated in three-dimensional computational fluid dynamic code (KIVA code). The exciplex fluorescence method was used for comparing the calculated results with the experimental ones. The experiment and the calculation were performed at the ambient pressures of 0.1 ㎫ and 0.5 ㎫ and the ambient temperature of 293K.
GDI 분무의 벽 충돌 과정에 대한 실험 및 수치적 연구
심영삼(Youngsam Shim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Experimental and numerical analysis about atomization and wall impingement process of hollow-cone fuel spray is performed by hybrid model and wall impingement model. The atomization process is modeled by using hybrid breakup model that is composed of Linearized Instability Sheet Atomization (LISA) model and Aerodynamically Progressed Taylor Analogy Breakup (APTAB) model. The Gosman model, which is based on the droplet behaviors after impingement determined by experimental correlations, is used for spray-wall impingement process. The LIEF technique was used to compare the results with those of experiment. The calculations and experiments are carried out at the ambient pressures of 0.1㎫ and 0.5㎫ and the ambient temperature of 293K.
다양한 분위기 압력에서 GDI 분무 해석을 위한 혼합 분열 모델 연구
심영삼(Youngsam Shim),황순철(Soonchul Hwang),김덕줄(Duckjool Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The purpose of this study is to obtain the accurate prediction for the atomization process of GDI spray on various ambient conditions. The computational study of hollow cone spray for high-pressure swirl injectors was performed. Several hybrid models using the modified KIVA code have been introduced and compared. LISA model and CSD model were used for the primary breakup, and TAB and APTAB models were used for secondary breakup. To compare with the calculated results, the experimental results such as cross-sectional images and SMD distribution were acquired by exciplex fluorescence method and Phase Doppler Analyzer respectively. The experiment and the<br/> computation was performed at the ambient pressure of 0.1 MPa, 0.5 MPa, 1.0 MPa and the ambient temperature of 293K. The results show that CSD+APTAB hybrid model has the best prediction for spray formation process.<br/>
증발 조건에서 벽면 형상에 따른 충돌 분무 거동의 수치적 연구
심영삼(Youngsam Shim),김동욱(Dongwook Kim),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Numerical study on a spray-wall impingement process was performed under vaporization condition, and the effect of the ambient temperature on the film formation of wall was investigated. A detailed understanding of this process will help in designing injection systems and controlling the strategies to improve engine performance and exhaust emissions. The improved Abramzon model was used for vaporization process of the spray and the Gosman model was adopted for modeling of spray-wall impingement process. These model was implemented in the KIVA code. The calculated results of spray-wall impingement process was compared with experimental results. The ambient velocity field, the Sauter Mean Diameter and the generated fuel film on the wall, which are difficult to obtain by the experimental methods, were also calculated and discussed. It was found that the numerical results show good agreement with the experimental ones.
노우진(Ujin Roh),심영삼(Youngsam Shim),천무환(Muhwan Chon) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
When the conceptual design phase or the modification design phase, it is essential to confirm realistic predictions of the 1-D air distribution ratio inside the combustor which has the complicated geometry. This accurate initial design would make that the less time is spent on following design period like 3-D CFD analysis and test. There are many research which have performed on the internal flow but these researches have focused on the simple shape like a circular pipe, an annular pipe, an orifice and so on. However, the configuration of the gas turbine combustor does not consist of simple configurations. Therefore, many researches have focused on the way to simplify the combustor geometry and on the correlation for the real combustor configurations. The purpose of this study is to verify the 1-D flow network modeling using the effective area test and define the air distribution ration of the combustor. The commercial 1-D network tool, ‘Flowmaster’ is used for 1D flow network modeling.