• Title/Summary/Keyword: Two-Stage Light Gas Gun

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Experimental Study on the Two-Stage Light-Gas Gun (2단 경가스총에 대한 실험적 연구)

  • Lee, Jung-Kuen;Lee, Jong-Sung;Kim, Heuy-Dong;Koo, Ja-Ye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.05a
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    • pp.345-348
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    • 2010
  • Light gas guns have a large number of applications in various fields of engineering. A two-stage light gas gun can develop an extremely high pressure in a very short interval of time. This can be employed efficiently in the application of ultra-high pressure liquid jets. In general, the two-stage light gas gun is made up of a high pressure tube, a compression tube and a launch tube, each stage being separated by diaphragms. The first diaphragm is installed downstream of the high pressure tube and the second, downstream of the compression tube. In the present study, experiments are carried out to investigate the projectile velocity and pressure behavior in the tubes according to the pressure changes at diaphragm opening. It is found that the rupture pressure of the first diaphragm has a dominant influence on projectile velocity. It is also observed that at pressures greater than 14 bar, the pressure in the launch tube exceeds that in the compression tube.

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Experimental Study on a Two-Stage Light-Gas Gun (2단 경가스총에 대한 실험적 연구)

  • Lee, Jung-Keun;Kim, Heuy-Dong;Koo, Ja-Ye
    • Journal of the Korean Society of Propulsion Engineers
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    • v.14 no.4
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    • pp.10-15
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    • 2010
  • Light gas guns have a large number of applications in various fields of engineering. A two-stage light-gas gun can produce an extremely high pressure in a very short interval of time. In general, the two-stage light-gas gun is made up of a high pressure tube, a compression tube and a launch tube, each stage being separated by diaphragms. This can be employed efficiently in the application of ultra-high pressure liquid jets. In the present study, experiments are carried out to investigate the projectile velocity and pressure behavior in the tubes according to the pressure changes at the frist diaphragm opening. In the present study result was found that the rupture pressure of the first diaphragm has a dominant influence on piston acceleration.

A Numerical Simulation of Projectile Aerodynamics Using a Ballistic Range (Ballistic Range를 이용한 Projectile 공기역학의 수치모사)

  • Jung S. J.;Rajesh G.;Kim H. D.;Lee J. M.
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.386-393
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    • 2005
  • The objective of the present study is to develop a new type of the Ballistic range, called 'two-stage light gas gun'. A computational work has been performed to investigate the aerodynamics of a projectile which is launched from the two-stage light gas gun. A moving coordinate method for a multi-domain technique is employed to simulate unsteady projectile flows with a moving boundary. The effect of a virtual mass is added to the axisymmetric unsteady Euler equation systems. The computed results reasonably capture the major flow characteristics which are generated in launching the projectile supersonically, such as the interaction between the shock wave and the blast wave, the interaction between the vortical flow and the barrel shock, and the steady under-expanded jet. The present computational results properly predict the velocity, acceleration, and drag histories of the projectile.

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A Theoretical Study for the Design of a New Ballistic Range

  • Rajesh G.;Lee J.M.;Back S.C.;Kim Heuy-Dong
    • Journal of Mechanical Science and Technology
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    • v.20 no.7
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    • pp.1019-1029
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    • 2006
  • The ballistic range has long been employed in a variety of engineering fields such as high-velocity impact engineering, projectile aerodynamics, creation of new materials, etc, since it can create an extremely high-pressure state in very short time. Of many different types of ballistic ranges developed to date, two-stage light gas gun is being employed most extensively. In the present study, a theoretical work has been made to develop a new type of ballistic range which can easily simulate a flying projectile. The present ballistic range consists of high-pressure tube, piston, pump tube, shock tube and launch tube. The effect of adding a shock tube in between the pump tube and launch tube is investigated. This improvement is identified as the reduction in pressures in the high pressure tube and pump tube while maintaining the projectile velocity. Equations of motions of piston and projectile are solved using Runge-Kutta methods. Dependence of projectile velocity on various design factors such as high pressure tube pressure, piston mass, projectile mass, area ratio of pump tube to launch tube and type of driver gas in the pump tube are also analyzed. Effect of various gas combinations is also investigated. Calculations show that projectile velocities of the order 8 km/sec could be achieved with the present ballistic range.

Numerical Simulation of Aerodynamic Characteristics of a Supersonic Projectile (초음속 발사체의 공력 특성에 관한 수치해석)

  • Lim Chae-Min;Lee Jeong-Min;Kim Heuy-Dong
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2005.11a
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    • pp.86-89
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    • 2005
  • A computational work has been performed to investigate the aerodynamics of a projectile which is launched from the two-stage light gas gun. A moving coordinate method for a multi-domain technique is employed to simulate unsteady projectile flows with a moving boundary. The effect of a virtual mass is added to the axisymmetric unsteady Euler equation system. The computed results reasonably capture the major flow characteristics which we generated in launching the projectile supersonically, such as the interaction between the shock wave and the blast wave, the interaction between the vortical flow and the barrel shock, and the steady under-expanded jet. The present computational results properly predict the velocity, acceleration, and drag histories of the projectile.

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Atomization Effect of Supersonic Liquid Jet by a Nozzle L/d of Subscale High-Pressure Injection System (축소형 초고압 분사 시스템의 노즐 L/d에 따른 초음속 액체 제트의 미립화 특성)

  • Shin, Jeung-Hwan;Lee, In-Chul;Kim, Heuy-Dong;Koo, Ja-Ye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.04a
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    • pp.196-199
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    • 2011
  • Subscale high-pressure injection system which use two-stage light gas gun composed with high-pressure tube, pump tube and launch tube can make supersonic liquid jet. The supersonic liquid jet enhances droplet atomization by shockwave in front of the jet. In this study, the experiments was executed to identify the atomization characteristics of the supersonic liquid jet using straight cone nozzle. SMD which presents the atomization characteristics was decreased from $151.2{\mu}m$ to $52.25{\mu}m$ by increasing of L/d.

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2-단계 기포(氣砲)의 성능 특성에 관한 연구

  • 최병철;허철준;탁정수;배기준;변영환;이재우
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2000.04a
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    • pp.19-19
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    • 2000
  • 항공 탄도학 분야에 있어서 여러 다양한 형태의 발사장치들이 제시된 바 있으나, 고속 분야에서 최고의 성능을 인정을 받은 것은 constant-base-pressure gun의 개념에서 나온 2-단계 기포(two-stage light gas gun)이다. 이러한, 2-단계 기포는 1, 2차 구동부와 피동부로 구성되며, 작동 원리가 간단하고 여러 작동 인자들의 변화를 통하여 성능 향상을 이룰 수 있다. 반면에 구조적인 강도 문제로 인한 작동 한계가 있으며 내부에서는 고온, 고밀도의 영향으로 추진기체에 Nonideality현상 등이 일어난다.

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An Experimental Study for the Performance Test of a Ballistic Range Simulator (Ballistic Range Simulator의 성능평가를 위한 실험적 연구)

  • Kang, Hyun-Goo;Rajesh, G.;Lee, Jung-Min;Kim, Heuy-Dong
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.11a
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    • pp.367-370
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    • 2006
  • The ballistic range has long been employed in a variety of engineering fields such as high-velocity impact engineering, projectile aerodynamics, creation of new materials, etc, since it can create an extremely high-pressure state in very short time. Two-stage light gas gun is being employed most extensively. The present experimental study has been conducted to develop a new type of ballistic range which can easily perform a projectile simulation. The ballistic range consists of a high-pressure tube, piston, pump tube, shock tube and launch tube. The experiment is conducted to find out the dependence of various parameters on the projectile velocity. The pressure in high-pressure tube, pressure of diaphragm rupture and projectile mass are varied to obtain various projectile velocities. This study also addresses the effect of the presence of a shock tube located between the pump tube and launch tube on system study. The experimental results are compared with those obtained through an author's theoretical study.

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Visualization of Supersonic Projectile Flow in a Ballistic Range (Ballistic Range를 이용한 초음속 Projectile유동의 가시화)

  • Kang, Hyun-Goo;Shin, Choon-Sik;Choi, Jong-Youn;Lee, Jong-Sung;Kim, Heuy-Dong
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.11a
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    • pp.263-266
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    • 2007
  • The ballistic range has long been employed in a variety of engineering fields such as high-velocity impact engineering, projectile aerodynamics, creation of new materials since it can create an extremely high-pressure state in very short time. Two-stage light gas gun is being employed most extensively. The present experimental study has been conducted to develop a new type of ballistic range which can easily perform a projectile simulation. The experiment is conducted to find out the dependence of various parameters on the projectile velocity. The pressure in high-pressure tube, pressure of diaphragm rupture and projectile mass and piston mass are varied to obtain various projectile velocities. The flow field is visualized to see flow around projectile.

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