| A Study on the Pressure-travel Curve of 5.56mm Rifle Obtained from the Empirical Base Pressure Factor |
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Sang-Kil Lee, Gang-Young Lee |
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Korea Military Academy |
| 탄저압력계수를 이용한 5.56mm 소총의 압력-이동거리 곡선 산출 |
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이상길, 이강영 |
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육군사관학교 |
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| Abstract |
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As the propellant mass is being accelerated out of the gun chamber along with the projectile, a continuous pressure gradient exists between the end of chamber and the base of the projectile. For this reason, the base pressure-travel curve is very important to design a conventional gun barrel in the interior ballistics, but it is not obtained briefly by empirical or theoretical method. In this paper, a simple relation between chamber pressure and base pressure was determined by the factor of base pressure(Cb) obtained from the experimental method. The simple relation gives a reasonable prediction for the reduction of pressure between the breech and the base of projectile owing to the axial gradient in the gun tube. The predictions have been validated by the infrared screen sensor and the PRODAS(PROjectile Design and Analysis System) for interior ballistic systems. Therefore, the base pressure-travel curve could be calculated from the chamber pressure measured by piezoelectric sensor. The base pressure-travel curve obtained from the simple relation offers initial information to gun barrel designer and is used for calculation of muzzle velocity. |
| Key Words:
Chamber Pressure, Base Pressure, Pressure-travel Curve, Factor of Base Pressure, Muzzle Velocity |
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