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성형건(H.G. Sung),장진성(J.S. Jang),최동환(D.W. Choi),노태성(T.S. Roh) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
A numerical code for the interior ballistics has been investigated. The method of the ghost cell extrapolation has been used for the moving boundary with the projectile movement. The porosity effect and the Ergun's Equation have been used in the numerical calculation for the grain combustion. The calculation results of the numerical code have been compared and verified through those of the lumped parameter mel hod. Computerization techniques of the numerical analysis for the interior ballistics have been developed.
성형건(H.G. Sung),장진성(J.S. Jang),오석환(S.H. Oh),김영호(Y.H. Kim),최동환(D.W. Choi),노태성(T.S. Roh) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The appearance of the negative differential pressure(NDP) between the breech pressure and the shot base pressure in the interior ballistics indicates that a risk of the serious damage on the barrel or the ammunition has increased. From this reason, the gun system must be designed to reduce the NDP during the ignition stage. So, the effect of the propellant configuration has been investigated on the NDP of the interior ballistics. In order to simulate the interior ballistics with, the gas-solid flow, the developed two-dimensional axi-symmetric code has been used with, the Eulerian-Lagrangian approach and the LSHUS method. The propellant geometry with, the progressive surface area has increased the NDP.
강내탄도 해석에 사용되는 Ergun식에 관한 수치적 연구
배세욱(S.W. Bae),성형건(H.G. Sung),노태성(T.S. Roh) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
In this study, the Erguns equation has been verified in order to calculate pressure drop of the two phase flow. The equation had been used in the high Reynolds number region for interior ballistic analysis in spite of being verified in the low Reynolds number region. Therefore additional verification seems to be inevitable. Thus, the validity of the equation has been verified using CFD in the high Reynolds number cases of the diameter-particle ratio 10, 13 and 16.
장진성(J.S. Jang),성형건(H.G. Sung),이상복(S.B. Lee),김인주(I.J. Kim),노태성(T.S. Roh),최동환(D.W. Choi) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
Using the numerical code for the interior ballistics, the performance of the interior ballistics with the characteristics according to the position of the solid propellant in chamber has been investigated. In existing research, propellants have been evenly distributed in the chamber. In this study, however, several cases of the existence of empty space in the chamber at which the propellants are not evenly distributed are considered. The 7-perforated propellant configuration has been used in this research. The results have shown the change of performance of the interior ballistics according to solid propellant positions in the chamber.
유승영(S.Y Yoo),성형건(H.G. Sung),장진성(J.S. Jang),노태성(T.S. Roh) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Pressure drops of two-phase flow in a pipe according to particle shapes have been calculated and analyzed. The numerical analysis for 3 cases of Reynolds number has been conducted for each particle shape. In case of the cylinder shape, the particles had been assumed to be randomly distributed for each Reynolds number. The results haw been averaged and compared to those of the case of the ball shape. Additionally, pressure drops of ball and cylinder shapes has been compared to the result of Ergun’s equation.
장진성(J.S. Jang),성형건(H.G. Sung),이상복(S.B. Lee),노태성(T.S. Roh) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.4
Using the numerical code for the interior ballistics, the performance of the interior ballistics with the characteristics according to the position of the solid propellant in chamber has been investigated. In existing research, propellants have been evenly distributed in the chamber. In this study, however, several cases of the existence of empty space in the chamber at which the propellants are not evenly distributed are considered. The 7-perforated propellant configuration has been used in this research. The results have shown the change of performance of the interior ballistics according to solid propellant positions in the chamber.
Expanded bed에서 레이놀즈수와 직경입자비에 따른 압력강하 특성에 관한 수치적 연구
배세욱(S.W. Bae),성형건(H.G. Sung),노태성(T.S. Roh) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.2
Characteristics of the pressure drop in an expanded bed have been compared to those in a packed bed for numerical study of the in tel phase drag in gas-particle flows. A numerical analysis of the pressure drop by the particle drag has been conducted according to the tube-to-particle diameter ratios and Reynolds numbers for comparison. As the tube-to-particle diameter ratios increase at the same Reynolds number, the pressure drop tends to converge. It has been confirmed that characteristics of the pressure drop in the expanded bed are similar to those in the packed bed.