Analysis of Axially Symmetric External Burning Propulsion for Bluff-Base Bodies

Mehta, Gopal; Strahle, Warren C.

doi:10.2514/3.61111

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…The stream wise slotted cavity is another passive device [6] that was found to yield a drag reduction; though insignificant due to the endured viscous losses. Active devices in base drag reduction include external burning [7][8][9][10] and base bleed. Nonetheless, using boattailing along with base bleed unit is the most common method of increasing base pressure [11,12].…”

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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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

View full text Add to dashboard Cite

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Flow computations past a triangular boattailed projectile

El-Awwad¹,

Ibrahim

Elshabkaa

et al. 2020

Defence Technology

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Computational Parametric Study and Live Firing Validation of Base-Bleed Exit Configuration

Aziz

Ibrahim

Riad

et al. 2023

Journal of Spacecraft and Rockets

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Base bleed, along with boattailing, is widely confirmed to be an efficient technique for drag reduction of projectiles. It is believed that the flow pattern at the projectile base, hence the level of drag reduction, is dependent on the base-bleed exit configuration design. It was also shown that bleeding from annular slots overperformed that from a single central orifice. However, central orifices are required for practical issues and may not be completely eliminated. The effect of simultaneous bleeding from the central orifice and annular slots was not adequately explored before. In addition, the impact of annular slot design on level of drag reduction was not thoroughly clarified in the available open literature. The objective of the present study was to systematically address these two gaps. Following parameterization of the bleed exit configuration, a set of three-dimensional computational simulations are conducted to find the design that yields the maximum drag reduction. A set of live firing experiments are conducted to assess the validity of simulation results. Based on parametric study results, the impact of bleed exit configuration on base flow pattern, base pressure, and total drag coefficient is explained. The optimized bleed configuration was found to yield a further drag reduction up to 5% compared to the baseline configuration, including a single central orifice.

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Analysis of Axially Symmetric External Burning Propulsion for Bluff-Base Bodies

Cited by 5 publications

References 6 publications

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

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

Flow computations past a triangular boattailed projectile

Computational Parametric Study and Live Firing Validation of Base-Bleed Exit Configuration

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