JOURNAL BROWSE
Search
Advanced SearchSearch Tips
An Experimental Study on the Ballistic Accuracy by Air Guide Grooves
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
An Experimental Study on the Ballistic Accuracy by Air Guide Grooves
Kim, Junkyu; Kim, Hyungse; Lee, Moonhwan;
  PDF(new window)
 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(). 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.
 Keywords
Drag;Bullet;Grooves;Vortex;Accuracy;Finite Analysis;
 Language
Korean
 Cited by
 References
1.
In-Young Kang, "Stability and Accuracy Analysis for the Shape of Supersonic Spin-stabilized Projectile," South Korea: ADD, 2003.

2.
S. Yoon, "Development Trends in Aerodynamic Analysis," Journal of the Korean Society for Aeronautical & Space Sciences, Vol. 2, 1994.

3.
S. Hwang, "Several Factors Affect the Ballistics Pistols and Rifles," South Korea: ADD, 2006.

4.
G. Choi, O. Rho, "Determination of Parameters Characterzing Dynamic Behavior of Bullet During Atmospheric Flight," Journal of the Korean Society for Aeronautical & Space Sciences, Vol. 6, 1978.

5.
Y. Kang, "Multi Disciplinary Design Optimization and Performance Evaluation of a Single-Stage Transonic Axial Compressor," ASME Turbo Expo., 2012.

6.
ANSYS Inc, "ANSYS CFX-Solver Theory Guide," Release 12.1, 2009.

7.
J. Kim, H. Kim, M. Lee, "An Experimental Study on the Ballistic Accuracy by Air Guide Grooves," KIMST Annual Conference Proceedings, 2015.

8.
Engineering Design Handbook, "Design for Control of Projectile Flight Characteristics," Headquarters U.S Army Materiel Command, 1966.

9.
Mehmet AKCAY, "Development of Universal Flight Trajectory Calculation Method for Unguided Projectiles," ITU Der-gisi in Turkish, 28, 369-376, 2004.

10.
McCoy, Robert, "Modern Exterior Ballistics: The Launch and Flight Dynamics of Symmetric Projectiles," Schiffer Pub., 1999.

11.
C. L. Farrar, D. W. Leeming, "Military Ballistics: A Basic Manual," Brassey's Publishers, 1983.

12.
Lee, H. J., "Gun and Ballistics," South Korea: Cheongmoon-Gak, 1998.