Optimization of artillery projectiles base drag reduction using hot base flow

Amin, Mohammed Dali; Jaramaz, Slobodan

doi:10.2298/tsci180413210d

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…The Computational approach was carried out using CFD software. The governing equations are based on Reynolds Averaged Navier Stokes equations (RANS), given by equations for the conservation of mass (continuity), momentum and energy, presented below (Dali et al 2019;Nicolás-Pérez et al 2017;Belaidouni et al .2016). To achieve closure of the governance equations, the k ε − realizable model was chosen in view of its wide use in similar studies (Chang et al 2023;Aziz et al 2020;Torangatti et al 2014;Belaidouni et al 2016), default constant values were employed for this model.…”

Section: Computational Approachmentioning

confidence: 99%

Prediction of Drag Aerodynamic Coefficient of the 155mm Projectile Under Axisymmetric Flow Using Different Approaches

Ferfouri,

Allouche,

D. Jerković

et al. 2023

JSSCM

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The determination of the total aerodynamic load which negatively influences the movement of artillery projectiles is inevitable and indispensable in order to be able to increase or control their ranges. The main part of this aerodynamic load that has the most influence on projectile movement is the drag force, which acts in the opposite direction to the velocity vector and therefore opposes its movement. From this, in this present work, the total drag coefficient of the 155mm M107 axisymmetric projectile under axisymmetric flow, at zero yaw, was predicted by semi-empirical and computational fluid dynamics (CFD) approaches in the three flow regimes, also the influence of its components on the total drag was analysed. The average deviation of the total drag coefficient in the three flow regimes, compared to the reference experimental results, is 5.7% for the semi-empirical results and 1.7% for the computational results. Analysis of the influence of the total drag components, such as pressure drag, friction drag and base drag, permitted to calculate their influence rates on the total drag as a function of Mach number and flow regime.

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Section: Computational Approachmentioning

confidence: 99%

Prediction of Drag Aerodynamic Coefficient of the 155mm Projectile Under Axisymmetric Flow Using Different Approaches

Ferfouri,

Allouche,

D. Jerković

et al. 2023

JSSCM

View full text Add to dashboard Cite

show abstract

“…A commercial CFD tool was utilized [44]. Two-equation turbulence models have been successfully used in similar simulations; K−epsilon model was implemented in [37,45] whereas K−omega model was used in [40,46]. In the present work, the K−epsilon with Realizable Enhanced Wall Treatment turbulent model was used.…”

Section: Fig 4 Structured 3-d Grid (One-eighth Domain)mentioning

confidence: 99%

“…On the other hand, the impact of bleed grain regression pattern on projectile total drag was addressed based on contrasting simulation and live firing results. The use of total projectile drag coefficient based on live firing results has been widely adopted to assess both the quality of simulations and the impact of base bleed [5,15,17,29,35,40].…”

Section: Introductionmentioning

confidence: 99%

Live Firing and 3D Numerical Investigation of Base Bleed Exit Configuration Impact on Projectile Drag

Aziz

Ibrahim

Riad

et al. 2022

AiMT

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Base bleed, in which gases are discharged at the base of projectile, is confirmed to be an effective drag reduction technique. Itis believed that the design of base exit can impact the pattern of gas bleeding and, hence, the level of drag reduction. The present study is aimed to address this dependence that was not clarified in previous studies by examining the reduction in drag acting on a projectile with two different base bleed exit configurations. The first configuration includes a central circular orifice while the other is modified to include a smaller central circular orifice and four annular slots with equivalent total area. Numerical simulations on 3‑D computational domain have been conducted to estimate drag and to explore the base flowfield for each configuration. The computational results at different Mach numbers have been compared with the mean drag based on range shooting for projectiles with both base configurations. In addition, different simulations have been performed to predict the real pattern of bleeding through the modified configuration based on the comparison with firing data at different Mach numbers.

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“…Some researchers have used components such as fins, blades, and jets to improve the aerodynamic characteristics of projectiles by introducing intelligent technologies [12,13]. Moreover, a bow shock wave in front of a hollow projectile affects drag reduction [14]. Introducing artificial intelligence, self-driving, and automated ballistic projectiles has been a step forward in this research direction [15].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Drag and Lift Forces on a Bullet Head

et al. 2022

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The bullet head plays a principal role in the modern enlargement of an efficient bullet. A bullet’s main design parameters depend upon the lift and drag forces acting on the head. The factors in a bullet’s shape design that affect bullets’ lift and drag forces are essential in aerodynamics, especially in ballistics. Therefore, the effect of wind on the lift and drag forces acting on the bullet, and the role of the bullet head to allow the bullet to travel efficiently through the wind, need to be investigated. This work discusses the parameters that affect the lift and drag force on the bullet. Simulations are performed in Ansys Fluent by varying the key parameters of the bullet head, i.e., the length and angle of attack, while keeping the air velocity at 5.2 m/s. The simulation outcome shows that the size of the bullet and the angle of attack are important factors related to the drag force. Therefore, this work predicts the inspection of a bullet under distinct wind conditions. An evaluation is performed to scrutinize the effect of design factors on the system execution of the bullet and its constructive flight path. It is concluded that when increasing the length of the bullet and its angle of attack (AOA), the drag force and lift forces increase drastically, contributing to the inefficiency of the bullet’s accuracy and penetrating power. A new design is also proposed in which the drag forces are reduced to the minimum.

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Optimization of artillery projectiles base drag reduction using hot base flow

Cited by 8 publications

References 23 publications

Prediction of Drag Aerodynamic Coefficient of the 155mm Projectile Under Axisymmetric Flow Using Different Approaches

Prediction of Drag Aerodynamic Coefficient of the 155mm Projectile Under Axisymmetric Flow Using Different Approaches

Live Firing and 3D Numerical Investigation of Base Bleed Exit Configuration Impact on Projectile Drag

Numerical and Experimental Analysis of Drag and Lift Forces on a Bullet Head

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