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Parametric Aerodynamic Evaluation & Design of Curved Brake Ring
Abstract
An artillery rocket generally utilises wrap around fin (WAF) assembly to provide static and dynamic inflight stability. Wrap around fin configuration poses additional advantage in terms of compact storage in launcher tube. However, rocket with wrap around configuration are susceptible to coning instability due to out of plane moment generated at certain Mach number and angle of attack combination due to curvature of the fin plan form. An artillery rocket is designed to perform certain intended operations. Rocket under consideration is designed to be used specifically in mountainous region and is intended to be fired at higher elevation to achieve minimum range of 12 km after crossing a cliff or two. The same rocket when fired with proximity fuze, poses additional requirement of specific angle of impact for desired target end effect. To meet explicit demand on angle of impact, fireman’s control on choice of angle of elevation is lost, which is a dictating factor to achieve minimum range by the rocket. This poses a need to design a mechanism by which the range reduces and the angle of impact for particular AoE increases, while maintaining rocket’s inflight stability. In presented work, drag augmentation mechanism is designed for a medium range artillery rocket which is fired with proximity fuze and uses WAF for providing in flight stability. WAF configuration combination with drag augmentation device is analysed crucially for side force generation point of view. Extensive CFD simulation is done for all rocket configurations and CFD data is validated using wind tunnel analysis for one of the design. An in house Six degree of freedom (DoF) trajectory model is utilised for flight performance prediction. Flight test is conducted for the finalised design and it matched well with the predicted data. A suitable design of brake ring maintaining required static & dynamics stability is finalised for rocket’s minimum range performance.
Keywords
Curved brake ring, Wrap around Fin, Dynamic Stability, Side Slip Angle.Text
DOI
10.12783/ballistics2019/33120
10.12783/ballistics2019/33120
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