The Influences of Forebody Parameters of Flat-nosed Projectile on Trajectory Stability and Range

doi:10.12382/bgxb.2023.0236

Abstract

Abstract:

The influences of forebody parameters on the trajectory stability and range of supercavitating projectile are studied in the paper. A high efficiency coupling method of flow field and trajectory is established based on modal dynamics, a quantitative evaluation method for the trajectory stability and efficient range of supercavitating projectile during tail-slapping is proposed, and the simulated cavity shape and tail-slapping trajectory are validated. On this basis, the change law of trajectory stability and range of the projectiles with different lengths and diameters of forebody are analyzed. Results show that the trajectory stability increases with the increase in the diameter and length of forebody, and the trajectory instability mode can be divided into direct instability and oscillate instability. With the increase in diameter, the maximum range increases at first and then decreases, the maximum range is 3.8 times of the minimum range in the design domain, which means the forebody parameters have a relatively large influence on the range of projectile.

Key words: supercavitating projectile, forebody parameter, trajectory, stability, range

CLC Number:

TJ630

XU Yuntao, TAN Dalin, YANG Chao, DAI Yuting, WANG Zhenxiao, ZHOU Peng. The Influences of Forebody Parameters of Flat-nosed Projectile on Trajectory Stability and Range[J]. Acta Armamentarii, 2024, 45(6): 1933-1941.

Figures/Tables 14

Fig.1 Comparison of cavity shape in this paper with experimental data and empirical formula

Fig.2 Supercavitating projectile model

Fig.3 Comparison of loads and pitch angle by two different methods during tail-slapping

Fig.4 Schematic diagram of fluid calculation domain and boundary conditions

Fig.5 Mesh of flow field

Fig.6 Mass,center of gravity and initial velocity of calculation cases

Fig.7 Distribution of projectile stability under all working conditions

Fig.8 Typical curves of pitch angle of trajectile

Fig.9 Force distribution at time of peak tail-slap under typical working conditions

Fig.10 Distribution of projectile stability

Fig.11 Curves of projectile kinetic energy decay of typical cases

Fig.12 Distribution of efficient range of projectile

Table 1 Correlation coefficient of efficient range

变量	与S相关系数	与SA_n相关系数
A_n	-0.85	—
m	-0.18	0.99
x_g	-0.34	0.97

Fig.13 Scatter diagram of efficient range of projectile

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