Simulation research on key parameters and resistance characteristics of inner conical hollow projectile

DOI:	10.11809/bqzbgcxb2024.05.008
Keywords:	internal cone hollow projectile; drag coefficient; numerical simulation; choke; wedge angle; throat diameter ratio
Abstract:	In order to reveal the relationship between the key parameters and resistance characteristics of the inner conical hollow projectile, based on the 30 mm diameter inner conical hollow projectile model, the resistance characteristics of the hollow projectile under different Mach numbers are obtained by changing the key parameters of wedge angle and throat diameter ratio using the computational fluid dynamics software Fluent. The results show that when the throat diameter ratio is too small as 0.2, the hollow projectile will become blocked, and the blocking cannot be eliminated by increasing the Mach number alone. Before removing the obstruction, with the increase of laryngeal diameter ratio, the resistance coefficient value decreases gradually, especially near the critical point of obstruction. After removing the obstruction, the resistance coefficient values did not change significantly with the increase of laryngeal diameter ratio. The Mach number required to eliminate obstruction decreases with the increase of laryngeal diameter ratio. The size of the wedge Angle has a great influence on the resistance characteristics. The larger the wedge Angle is, the easier it is to cause obstruction. Under the condition of the same throat diameter ratio and Mach number, the greater the wedge Angle, the greater the resistance coefficient. When the ratio of wedge angle to throat diameter is the same, the larger the Mach number, the smaller the resistance coefficient value. In the design of hollow projectiles and similar projectiles, the effects of wedge angle, throat diameter ratio and Mach number on aerodynamic characteristics should be considered at the same time.
Published:	2024-05-31
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