Investigation of Reshaping Pin Protuberance for Missile Flight Control in Supersonic Flow

Stephen, Eric J.; Broadbent, Drew Q.; Matherne, Brent A.; McLaughlin, Thomas

doi:10.2514/6.2018-1515

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Therefore, it is very important to investigate the relationship between protuberances and the resulting side force to guarantee the safety of vehicle launch trajectories. It has also been reported that asymmetric protuberances may be attached to rocket fairings and that the generated side forces can be used to control rockets [7][8]. Side forces have been observed not only as a result of axial asymmetric protuberances on the surface of slender-bodied objects, but of high angles of attack [9][10].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigations of Slender Body Side Force with Asymmetric Protuberances

Kawauchi

Harada

Kitamura

et al. 2019

Journal of Spacecraft and Rockets

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Typical space transportation vehicles have various asymmetric protuberant devices on their surfaces, such as cable ducts and side jet motors. Such protuberances, when arranged asymmetrically with respect to the vehicle axis, are known to cause asymmetric vortices that produce side force. In this study, to understand effects of side force and its associated flow fields, both wind tunnel tests and numerical calculations for a slender body with an asymmetric protuberance were conducted at a wind speed of Mach 1.5. The results of computed aerodynamic coefficients are in good agreement with the experimental results and detailed flow structures are provided. In particular, the results revealed that side force was generated by two factors. It linearly increased as vortices detached from the body and nonlinearly increased based on the effects of secondary vortex scale as the angle of attack increased. Additionally, the axial position and azimuthal angle (angle along the circumferential direction around the body axis) of the protuberance strongly influenced side force characteristics. First, the side force was significantly higher when the protuberance was installed in a forward axial position. Second, when the protuberance was installed on the leeward side of the slender body (upper side), the side force increased with the angle of attack. These results are not limited to the presented configuration and can be applied to other rocket designs for cost reduction and safety enhancement.

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Section: Introductionmentioning

confidence: 99%

“…Additionally, corresponding experiments were not conducted. As mentioned above, the authors of [5][6][7][8][9][10][11][12][13] only presented aerodynamic characteristics from either wind tunnel experiments or numerical calculations independently, or focused on a specific configuration.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations of Slender Body Side Force with Asymmetric Protuberances

Kawauchi

Harada

Kitamura

et al. 2019

Journal of Spacecraft and Rockets

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Aerodynamic Effects of Surface Protuberance Size on Slender-Bodied Supersonic Vehicle

Nimura,

Tsutsui,

Kitamura

et al. 2024

Journal of Spacecraft and Rockets

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The presence of protuberances can create an asymmetric flowfield, which contributes to side forces in slender-bodied launch vehicles. In this study, we conduct numerical calculations using a supercomputer at Japan Aerospace Exploration Agency (JAXA) on a slender body with a different-sized protuberance at Mach 1.5 to systematically determine the aerodynamic effects of the protuberance size. The protuberance size is varied in its height and width. According to the results, it is demonstrated that the side force significantly increases when the height of the protuberance increases. This is because, the higher the protuberance, the farther the wake vortex produced by the protuberance moved away from the body. Consequently, the flow asymmetry between the protuberance side and clean side is augmented, and the side force increases. In contrast, the side force is almost constant when only the width of the protuberance is changed. The results of this study indicate that when attaching the protuberance to the vehicles the height of the protuberance should be lowered, and the width of the protuberance should be increased to secure the volume of the protuberance and reduce the increase in side force.

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Investigation of Reshaping Pin Protuberance for Missile Flight Control in Supersonic Flow

Cited by 2 publications

References 6 publications

Experimental and Numerical Investigations of Slender Body Side Force with Asymmetric Protuberances

Experimental and Numerical Investigations of Slender Body Side Force with Asymmetric Protuberances

Aerodynamic Effects of Surface Protuberance Size on Slender-Bodied Supersonic Vehicle

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