Aerodynamics of projectiles with wrapped around and grid fins

Afzal, Sher; Baig, Ajmal; Rafique, Mohsin

doi:10.1109/ibcast.2013.6512165

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Afzal et al 13 considered aerodynamics performance of projectiles with wrapped around and grid fins. They found from stability point of view the WAF is more advantageous as compared with grid fin configuration.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of aerodynamic effects of opposite wrap-around fins at supersonic speeds

Bagheri

Pasandideh‐Fard

Sabour³

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this research work, using numerical simulations, the three-dimensional flow around a standard projectile is investigated with two fin arrangement models, namely opposite and conventional wrap-around fins. Eliminating the rolling moment and investigation of aerodynamic performance of the new geometries are the purpose of this paper. Finite volume method is used to undertake the numerical simulations where flow is considered to be compressible, steady, nonviscous, and three-dimensional. For this purpose, the research begins with simulating the flow around a projectile with conventional fin arrangement and then the obtained values of drag coefficients and rolling moment are compared against experimental data, indicating the validity of the simulation results. After then, the effect of wrap-around fins in an opposite arrangement is investigated, with the results compared against those of the conventional configuration. The opposite fins are investigated at different opening angles and joint position, while the area of fins shading is assumed constant in all cases. Simulations were conducted at three Mach numbers of 1.5, 2.5, and 3.5, different angles of attack ranging within 0–14°, and lateral wind angles up to 8°. According to the results, the rolling moment in conventional wrap-around fins is a result of the pressure difference between sides of the fins, so that it can be avoided by configuring the fins in an opposite arrangement, which contributes to slightly higher drag coefficients too. Fin dimensions and their opening angle influence the regime of the flow passing through the fins, making their aerodynamic performance variable at different Mach numbers.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of aerodynamic effects of opposite wrap-around fins at supersonic speeds

Bagheri

Pasandideh‐Fard

Sabour³

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Compared with the above methods, CFD is the kind of simulation method by which we can intuitively get the distribution of the flow field, and for the reasons that the process is simple and the results reliable and accurate, it is widely used for aerodynamic parameter calculations of guided projectiles, resulting in it becoming a hot area of aerodynamic research. For example, the CFD simulation has been used for the aerodynamic characteristic study of the spin-stabilized artillery shell by Hamel and Gagnon, 1 Je et al, 2 Fu et al, 3 and Yin et al, 4 used for the aerodynamic characteristic study of the fin-stabilized rocket by Afzal et al, 5 Sahu,6 Zhimin et al, 7 Sahu et al, 8 Zhang et al, 9 and López et al, 10 and used for the aerodynamic characteristic study of the mortar projectile by Su et al, 11 Li et al, 12 and Chengen et al 13 Most of the CFD simulations that are used for aerodynamic characteristic studies on projectiles, are focused on the effect of geometry on the aerodynamic parameter. The contrastive analysis of the CFD simulation method is relatively less.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the aerodynamic parameters simulation method of a guided rocket

Chen

Gao

2017

SIMULATION

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Orthogonal design method is adopted to investigate the aerodynamic parameters simulation method of a canard guided rocket, in order to obtain one simulation method which can calculate the aerodynamic parameters quickly, reliably, and accurately. The turbulence model, mesh size, y + value and flow field size, which are regarded as the main factors in computational fluid dynamics (CFD) simulation, are divided into three levels for comparative analysis. Nine simulation combination schemes, which are representative and comprehensive, are singled out based on orthogonal table. The axial force coefficient and normal force coefficient in subsonic, transonic, and supersonic conditions are respectively calculated with these nine simulation combination schemes. The best simulation combination schemes in subsonic, transonic, and supersonic conditions are respectively picked out by intuitive analysis and synthesis balance analysis. The aerodynamic parameters in different velocities and attack angles, which were obtained by corresponding best simulation combination schemes, prove that the best simulation combination schemes are accurate. The results provide basis for the aerodynamic characteristic study of the canard guided rocket, and this research method can be used for the investigation on aerodynamic parameters simulation method of projectiles with different configurations.

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Aerodynamics of projectiles with wrapped around and grid fins

Cited by 2 publications

References 2 publications

Numerical investigation of aerodynamic effects of opposite wrap-around fins at supersonic speeds

Numerical investigation of aerodynamic effects of opposite wrap-around fins at supersonic speeds

Investigation of the aerodynamic parameters simulation method of a guided rocket

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