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Eulerian-Lagrangian 접근법과 SMART scheme을 이용한 강내탄도 전산해석 코드 개발
성형건,장진성,이상복,최동환,노태성,장영재,Sung, Hyung-Gun,Jang, Jin-Sung,Lee, Sang-Bok,Choi, Dong-Whan,Roh, Tae-Seong,Jang, Young-Jae 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3
In this paper, a numerical code for the interior ballistics has been investigated. The Eulerian-Lagrangian approach and the SMART scheme have been used in the numerical code for the grain combustion. The translational kinetic energy of the projectile and work done against barrel friction have been considered only. The ghost cell extrapolation method has been used for the chamber change with the projectile movement. The calculation results of the numerical code have been compared and verified through those of IBHVG2 code.
성형건(Hyung-Gun Sung),장진성(Jin-Sung Jang),최동환(Dong-Whan Choi),노태성(Tae-Seong Roh) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.11
Lumped parameter model에 오리피스의 이론식을 결합하여 강내탄도의 점화기 해석 모델을 개발하였다. 이 개발된 점화기 해석 모델을 이용하여 점화기 형상인 길이, 직경, 주입구 분포에 따른 강내탄도의 특성을 분석하였다. 포미와 초기탄저의 압력차의 결과로서 점화기 길이는 저주파 진동에 영향을 미치는 것으로 나타났고, 점화제 주입구 직경과 주입구 분포는 고주파 진동에 영향을 주는 것으로 나타났다. A numerical model of the igniter for the interior ballistics has been developed combining the lumped parameter model with the theoretical equation of the orifice. With the developed model of the igniter, the numerical study on characteristics of the interior ballistics according to the igniter configuration in terms of the igniter length, the side hole diameter, and the distribution of side holes has been conducted. As results of the calculation of the pressure difference between the breech and shot base, the low frequency oscillations have been influenced by the igniter length, while the high frequency oscillations have been affected by the side hole diameter and the distribution of side holes.
성형건(Hyung-Gun Sung),장진성(Jin-Sung Jang),김인주(In-Joo Kim),최동환(Dong-Whan Choi),노태성(Tae-Seong Roh) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
강내탄도 전산 해석 코드를 사용하여 점화제 주입 특성에 따른 강내탄도의 성능을 연구하였다. 점화제 주입 최대위치가 Base에 가까울수록 균일한 압력 분포가 나타났고 탄자의 탈출 속도도 증가하였다. Using the numerical code for the interior ballistics, the performance of the interior ballistics with the characteristic of the ignition injection has been investigated. When the maximum position of ignition injection is near the base, the pressure distribution at the chamber of the interior ballistics was uniform and the final projectile velocity is increased.
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(Hyung-Gun Sung),장진성(Jin-Sung Jang),유승령(Seung-Young Yoo),오석환(Seok-Hwan Oh),최동환(Dong-Whan Choi),노태성(Tae-Seong Roh) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
화포에서 탄저 압력이 포미 압력 보다 높은 역압력 구배가 발생하면 화포에 잠재적인 충격이 증가하는 것으로 알려져 있다. 화포의 안전성을 확보하기 위해 발사 과정에서 이 역압력 구배를 최소화시키는 설계가 필요하다. 이에 수치 해석을 통해 점화제 연소율이 역압력 구배에 미치는 영향을 조사하였다. 점화제 연소율 상수가 증가할수록 역압력 구배는 증가하였고, 특정 연소율 계수에서 급격한 압력 변동이 발생하였다. The appearance of the negative differential pressure(NDP), in which the shot base pressure is higher than the breech pressure, indicates that a potential damage on the gun system is increased. In order to safeguard the gun system, the igniter must be designed to minimize the NDP during the firing process. From this reason, the effect of igniter’s burning rate on the NDP of the interior ballistics has been investigated through the numerical simulations. The NDP has been increased with increment of the coefficient in the burning rate of the igniter. A sudden change of the chamber pressure has been shown in case of using a singular coefficient.
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.
성형건(Hyung-Gun Sung),박솔(Sol Park),홍기철(Gi-Cheol Hong),노태성(Tae-Seong Roh),최동환(Dong-Whan Choi) 한국추진공학회 2008 한국추진공학회지 Vol.12 No.6
The efficient plan and numerical methods for development of the interior ballistics code have been investigated. The schemes of the numerical code for the moving boundary with the projectile movement have been compared and verified through the free piston motion problem. The combustion of solid propellants and the pressure gradient in the chamber by the porosity effect have been predicted based on the numerical calculation of the initial combustion of the interior ballistics. Computerization techniques of the fundamental schemes and plans for development of the numerical analysis code for the interior ballistics have been obtained.
성형건(Hyung-Gun Sung),유승령(Seung-Young Yoo),이상복(Sang-Bok Lee),최동환(Dong-Whan Choi),노태성(Tae-Seong Roh) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.4
The analysis of performance and internal flow according to various numerical models for interior ballistics has been conducted. The initial flow has been mainly affected by the drag model of propellants and their drag degradation reduces oscillations of differential pressure between the breech and the shot base. Models of Nusselt number havent influenced the major performance of interior ballistics. The negative differential pressure isnt generated in the case without the heat transfer of propellants.
강내탄도 전산해석 코드 개발과 항력 모델에 따른 이상유동 분석
성형건(Hyung-Gun Sung),장진성(Jin-Sung Jang),유승령(Seung-Young Yoo),노태성(Tae-Seong Roh) 한국추진공학회 2011 한국추진공학회지 Vol.15 No.6
In order to simulate the ignition-gas injection in the interior ballistics, a two-dimensional analytic code for two-phase flows has been developed. The Eulerian-Lagrangian approach and the low-dissipation simple high-resolution upwind scheme(LSHUS) have been adopted in the numerical code for the propellant combustion of the gun propelling charges. The ghost-cell extrapolation method has been used for the moving boundary in the chamber with the projectile movement. The calculation results of the developed code have been compared and verified through those of the dimensionless IBHVG2 code and the previous one-dimensional code. In comparison with the two-phase flows according to the drag models, the numerical analysis of the muzzle velocity has been affected by the drag model.