Transonic Flow Past Axisymmetric and Nonaxisymmetric Boatt ail Projectiles

Stahara, S. S.; Elliottt, James P.; Spreiter, J. R.

doi:10.2514/3.51192

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Actually, their main concern was prediction of the surface pressure, normal force and pitching moment coefficients using three-dimensional inviscid flow field computations past a nonspinning non-conical boattail. Some computational studies using different techniques were carried out in order to investigate the steady inviscid aerodynamic behavior of projectiles having conical, triangular and square boattail shapes [15,16]. These studies concerned in finding analytical solution predicting some parameters affecting the stability of a projectile provided with one of the unconventional boattails at transonic speeds.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Flow Characteristics of Air Past a Projectile With a Triangular Base

El-Awwad

Ibrahim

El-Sebae

et al. 2012

The International Conference on Applied Mechanics and Mechanica

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A computational study has been carried out to investigate the air flow over a projectile provided with a triangular base at transonic and supersonic speeds. The study aims to discuss the effect of the triangular base on the air flow characteristics comparing with the flow over a typical projectile. One of the study main concerns is the drag since it is the key issue in the projectile range. Good agreement is noted when comparing the computational drag coefficients with the experimental work of Platou [11]. The study shows that the flat surfaces of the unconventional boattail cause the formation of a single normal shock wave at transonic speeds. Moreover, these surfaces may be a main reason for the shock wave smearing at transonic/supersonic speeds and lower turbulence level in the base region. A diminishing of the wake behind the unconventional base is noted resulting in nearer rear stagnation point and lower base drag.

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Section: Introductionmentioning

confidence: 99%