Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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An Experimental Study on the Ballistic Accuracy by Air Guide Grooves

공기안내홈이 탄도 정확도에 미치는 실험적 연구

  • Kim, Junkyu (Department of Mechanical Engineering, Hanyang University) ;
  • Kim, Hyungse (The R&D Institute, DURETEK LTD.) ;
  • Lee, Moonhwan (The 5th Research and Development Institute, Agency for Defense Development)
  • 김준규 (한양대학교 기계공학부) ;
  • 김형세 ((주)두레텍 기술 연구소) ;
  • 이문환 (국방과학연구소 제5기술연구본부)
  • Received : 2015.09.21
  • Accepted : 2016.03.25
  • Published : 2016.04.05
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Abstract

An experimental study has been found the air guide grooves for reducing drag. When a bullet is fired and move in the air, the drag is generated. The vortex which is one of the types of drag hinders the movement of the bullet. To solve this phenomenon, cut a negative grooves that we are called the air guiding grooves at the back of bullet. The grooves bullet has identified that the drag compared to conventional ammunition(KM80 and K193) is reduced to 4.480 and 4.054 : 10 % through a Finite Analysis Program($Ansys^{TM}$). Even pressure center was retreating 0.72 % compared to a Bullet(KM80 and K193). Effect obtained with these results is the accuracy of the grooves bullet in a shooting test was improved by over 32 %(KM80: 2.86, air guide grooves : 1.94) compared to conventional ammunition(KM80 and K193). In addition, muzzle velocity is increased 73 m/s. This is expected to be extended the velocity and effective range of bullet. Also, the velocity of the grooves bullet is increased when moving in the air while the velocity of the bullet(KM80 and K193) is reduced. The gas ejected from the muzzle to be balanced and stable flight of the Bullet. Given these effects, we can reckon the air guide grooves have positive influence.

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References

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