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기용덕(Yong-Duck Ki),박형구(Hyung-Koo Park) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The flow characteristics along a intake/compression process are very important for the combustion<br/> process. The intake/compression flow fields are related to the piston shape of engine. The flow fields<br/> are analysed by using the ICEM-CFD IC3M code for the rapid mesh-generation and by using the<br/> STAR-CD code for the calculations. The influences of the piston bowl shapes were investigated. The<br/> results showed that piston shapes had influences on a intake/compression flow and offered the definite<br/> basic data in a design side.
가솔린직접분사기관에서 흡기포트 및 피스톤의 형상에 따른 유동해석
박찬국(Chan-Guk Park),박형구(Hyung-Koo Park),임명택(Myung-Taeck Lim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
In this paper, the characteristics of flow resulting from the configurations of piston head and intake-port of the cylinder in a gasoline-direct-injection engine are investigated numerically. Calculations are carried out from intake process to the end of compression. GTT code which includes the third order upwind Chakravarthy-Osher TVD scheme and k-ε, turbulence model with the law of wall as a boundary condition. As a result, a piston head with a smaller radius of curvature and larger radius gives stronger reverse tumble. It is also shown that as the maximum tumble ratio increases by the configuration of the intake-port the tumble ratio at the end of compression stroke increases. It is concluded that flows at the end of compression stroke can be controlled by the optimum design of intake-port and piston head.
CFD 방법을 이용한 분지관에서 비뉴턴 유체 유동에 대한 기초해석
황도연(Doyeon Hwang),박형구(Hyung-Koo Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The objective of this paper is simulating the non-Newtonian flow through both bifurcated rigid tube model by the CFD method. Originally, this is the fundamental analysis of the blood flow through the blood vessel suffering from atherosclerosis. A commercial FVM code, which is SC/Tetra, is used for this purpose. To describe a non-Newtonian characteristic of the blood flow, the several viscosity models are used; the Powell-Eyring model, the Cross model, the Carreau model, and etc. The angle and the diameter of the branched children are co-related, and models of various sizes are used. Finally, the results are analyzed with regard to viscosity models and sizes. Such factors as the WSS(wall shear stress), the WSSG(wall shear stress gradient) and the velocity profile are investigated. The results are compared with the existing data. The analysis of factors above under more low shear stress condition should be required.
가솔린직접분사기관에서 흡기포트 및 피스톤의 형상에 따른 유동해석
박찬국(Chan-Guk Park),박형구(Hyung-Koo Park),임명택(Myung-Taeck Lim) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
In this paper, the characteristics of flow resulting from the configurations of piston head and intake-port of the cylinder in a gasoline-direct-injection engine are investigated numerically. Calculations are carried out from intake process to the end of compression. GTT code which includes the third order upwind Chakravarthy-Osher TVD scheme and k-ε, turbulence model with the law of wall as a boundary condition. As a result, a piston head with a smaller radius of curvature and larger radius gives stronger reverse tumble. It is also shown that as the maximum tumble ratio increases by the configuration of the intake-port the tumble ratio at the end of compression stroke increases. It is concluded that flows at the end of compression stroke can be controlled by the optimum design of intake-port and piston head.
지하터널에서 주행하는 전동차의 하부에서 발생한 입자의 이동경로 예측
이경란,김원근,육세진,우상희,김종범,배귀남,박형구,윤화현,Lee, Kyung-Ran,Kim, Won-Geun,Yook, Se-Jin,Woo, Sang-Hee,Kim, Jong Bum,Bae, Gwi-Nam,Park, Hyung-Koo,Yoon, HwaHyeon 한국입자에어로졸학회 2015 Particle and Aerosol Research Vol.12 No.3
In this study, the flow around a subway train running in an underground tunnel was numerically estimated. For the validation of the numerical results, the airflow velocity at a point underneath a subway train was measured using an ultrasonic anemometer. Then, the trajectories of particles generated at the contact points between the wheels and rails were numerically predicted. By considering the airflow velocity and particle trajectories, the space underneath the T-Car (trailer car) was expected to be appropriate for the room for the installation of a dust-removal system.
주경제(Kyung-Jei Joo),최욱(Wook Choi),이제형(Jei-Hyung Lee),최병철(Byung-Chul Choi),박형구(Hyung-Koo Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The transient flow fields in direct injection engine was analyzed by using the STAR-CD CFD code during the intake/compression processes, The analyses were focused on the computation grid generation by using the IC3M code and compared with experimental data. The results showed that the used grid generation technique was well suited for the flow analyses on any internal combustion engines