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EFFECT OF BOURRELET LENGTH ON MAGNUS MOMENTS AND FLIGHT STABILITY OF THE PROJECTILE
Abstract
Aerodynamic design of an artillery shell often presents a challenging situation for the designer. Design parameters which enhance in-bore performance of shell in terms of reduced balloting & acceptable yaw rates at the muzzle end, in-turn disturbs the in-flight stability in certain flight regime. Similarly, design parameters which enhances in-flight static & dynamic stability, adversely affect the motion of shell inside barrel. Hence, an optimal selection of values of each design parameter is mandatory to attain desired performance of the ammunition both outside and inside the barrel. One of such design parameters is the Bourrelet distance or wheelbase, which is considered for this study. Parametric studies to evaluate comparative aerodynamic performance of artillery shell with varying bourrelet distance in terms of four major performance parameters such as Muzzle Jump Factor (MJF), Drag characteristics, Gyroscopic Stability & Dynamic Stability are carried out using commercially available software, PRODAS Version 3.2. Out of these four parameters, only MJF & Dynamic stability parameters are analysed in detail in the present work. Comparative values of MJF are used to evaluate inbore stability in terms of initial yaw rate at muzzle exit. Dynamic stability is evaluated in terms of Magnus moment generated by spinning shell. Effect of Magnus moment in terms of total angle of attack damping response during flight is studied by simulating trajectory of the shell for all firing zones. To study the effect of bourrelet distance on performance parameters, bourrelet distance is varied from 0.6 Cal to 1.4 Cal, where Cal is the maximum
DOI
10.12783/ballistics22/36131
10.12783/ballistics22/36131
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