Study on Rolling Characteristics of the Projectile with Wide-Angle Oblique Empennages
- 1 The College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China
- 2 The College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China
- 3 The College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China
- 4 The College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China
- 5 The College of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, China
Abstract
Due to requests on high rotary velocity of novel smart empennage-stable projectiles, the rolling characteristics under wide-angle oblique angles are studied. Since the wind tunnel tests performed verify numerical simulation, so that the latter method can be applied to study the rolling characteristics widely combining theoretical models. In the theoretical part, the rolling dynamics equations are established considering the span, taper ratio and oblique angle of the empennages, and are further solved combing ballistic equations. For the simulation, the rolling moment coefficients under various rotary velocities are solved based on rotating coordinate system methods, so that the balance rotary velocity can be obtained using interpolation. The results indicate that shorter span, higher taper ratio and especially larger oblique angle can bring higher projectile rotary velocity; the balance rotary velocity is approximately linear to the oblique angle in a certain range.
- Yang, S.Q. (2010) Smart Ammunition Engineering. National Defence Industry Press, Beijing.
- Jenke, L.M. (1975) Experimental Roll-Damping Magnus, and Static Stability Characteristics of Two Slender Missile Configurations at High Angles of Attack (0 to 90 deg) and Mach Numbers 0.2 through 2.5. AEDC-TR 76-58.
- Cheng, J., Wang, X.M., Yu, J.Y. and Yao, W.J. (2015) Study on the Effect of Sub-Caliber Asymmetry Canards on the Aerodynamics of Trajectory Correction Projectiles. Transactions of Beijing Institute of Technology, 35, 133-138.
- Sahu, J. (2007) Numerical Computations of Dynamic Derivatives of a Finned Projectile Using a Time Accurate CFD Method. AIAA Atmospheric Flight Mechanics Conference and Exhibit, South Carolina, 20-23 August 2007, AIAA 2007-6581. http://dx.doi.org/10.2514/6.2007-6581
- Bhagwandin, V. (2012) Numerical Prediction of Roll Damping and Magnus Dynamic Derivatives for Finned Projectiles at Angle of Attack. 30th AIAA Applied Aerodynamics Conference, New Orleans, 25-28 June 2012, AIAA 2012-2905. http://dx.doi.org/10.2514/6.2012-2905
- Qian, W.Q. and Cai, J.S. (1999) Numerical Simulation of Turbulent Flow Past Airfoil at Low Mach Number. Acta Aeronautica et Astronautica Sinica, 20, 261-264.
- Deng, F., Chen, S.S., Tan, X.Z. and Xu, T. (2010) Investigation of Aerodynamic Characteristics of Canard Configuration Long-Range Missile with Different Tails in Transonic and Supersonic Flow. Journal of Experiments in Fluid Mechanics, 24, 46-50.
- Miller, F.P., Vandome, A.F. and Mcbrewster, J. (2010) External Ballistics. Alphascript Publishing, 105-185.