Quiet Spike Prototype Flight Test Results

Freund, Donald; Simmons, Frank; Spivey, Natalie; Schuster, L. S.

doi:10.2514/6.2007-1778

Cited by 12 publications

(6 citation statements)

References 5 publications

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“…However, the pitching moment coefficient ( C mq ) showed less damping, but it deviated outside the acceptable range in transonic and supersonic regimes. The same conclusion was validated by Donald et al 113 that the spike is beneficial for reduction of the sonic boom, but it possesses destabilizing contribution to aircraft in supersonic conditions. However, further studies concluded that short-period damping was decreased in subsonic and supersonic regimes but increased in the transonic region.…”

Section: Passive Flow Control Techniquessupporting

confidence: 70%

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

Rashid

Nawaz

Maqsood

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Typical challenges of supersonic flight include wave drag, acoustic signature, and aerodynamic heating due to the formation of shock waves ahead of the vehicle. Efforts in the form of sleek aerodynamic designs, better propulsion systems, and the implementation of passive and active techniques are generally adopted to achieve a weaker shock wave system. Shock reduction can improve flight range, reduce fuel consumption, and provide thermal protection of the forebody region. This paper briefly reviews shock reduction techniques, including passive, active, and hybrid flow control. Airfoil shape optimization, mechanical spike, and forebody cavities are studied as passive flow control approaches. For active flow control, developments in the area of opposing jets and energy deposition are explored. The combination of active and passive flow control and the hybrid flow techniques are discussed in the end. The discussions include the principle of operation, physics of fluid behavior, and overall contribution to flight stability characteristics. The implications in the usage of these technologies, along with potential gaps, are also identified. This comprehensive review can serve as the basis for contemporary solutions to realize sustainable supersonic travel for the aviation industry.

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Section: Passive Flow Control Techniquessupporting

confidence: 70%

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

Rashid

Nawaz

Maqsood

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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show abstract

“…While shock waves are inherent to supersonic flight and cannot be eliminated, the ground pressure distribution can be modified by varying the aircraft geometry [46]. Therefore, it will be advantageous as research continues to consider a supersonic aircraft capable of in-flight sonic boom mitigation for different flight and atmospheric conditions to satisfy acceptable loudness requirements at ground level while also generating low drag [47,48].…”

Section: Strategies To Mitigate Perceived Levelmentioning

confidence: 99%

“…Additional control surfaces could be added to the vehicle to induce significant geometric changes, allowing for boom shaping. Some features such as a quiet spike (a reconfigurable nose cone) could change the length of the aircraft and the sonic boom signature [47].…”

Section: Large Reconfigurations (Trl 8)mentioning

confidence: 99%

Effects of Atmospheric Profiles on Sonic Boom Perceived Level from Supersonic Vehicles

Leal¹,

Schrass²,

Giblette³

et al. 2021

AIAA Journal

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U.S. national research priorities include reducing the disruption caused by sonic booms, which hindered the economic viability of supersonic aircraft in decades past. However, shock waves are unavoidable during supersonic flight; and exposure of people, animals, and structures to these shock waves on the ground cannot be eliminated entirely. It is herein shown that changing atmospheric conditions, gusts, and heights above ground can result in any supersonic aircraft that is acceptably quiet at specific atmospheric conditions becoming uncomfortably loud in other flight conditions. These performance variations are noticeable for periods ranging from 12 h to one year across the continental United States of America. Therefore, strategies to actively mitigate sonic booms may become necessary as researchers work toward resumption of overland commercial supersonic flight.

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“…45, is that the series of weak shocks generated by each of the telescoping sections will not coalesce into an N-wave but propagate to the ground in parallel fashion. The Quiet Spike has proven that it can play a significant role in achieving the desired area distribution for a low-boom aeroplane [108][109][110]. During the NASA N+2 Advanced Supersonic Commercial Transport Aircraft project, tests were carried out in NASA Ames 9'×7' supersonic wind tunnel to validate boom shaping tools.…”

Section: Mitigation Through Exotic Conceptsmentioning

confidence: 99%

Review and prospect of supersonic business jet design

Sun

Smith

2017

Progress in Aerospace Sciences

106

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This paper reviews the environmental issues and challenges appropriate to the design of supersonic business jets (SSBJs). There has been a renewed, worldwide interest in developing an environmentally friendly, economically viable and technologically feasible supersonic transport aircraft. A historical overview indicates that the SSBJ will be the pioneer for the next generation of supersonic airliners. As a high-end product itself, the SSBJ will likely take a market share in the future. The mission profile appropriate to this vehicle is explored considering the rigorous environmental constraints. Mitigation of the sonic boom and improvements aerodynamic efficiency in flight are the most challenging features of civil supersonic transport. Technical issues and challenges associated with this type of aircraft are identified, and methodologies for the SSBJ design are discussed. Due to the tightly coupled issues, a multidisciplinary design, analysis and optimization environment is regarded as the essential approach to

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Quiet Spike Prototype Flight Test Results

Cited by 12 publications

References 5 publications

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

Review of wave drag reduction techniques: Advances in active, passive, and hybrid flow control

Effects of Atmospheric Profiles on Sonic Boom Perceived Level from Supersonic Vehicles

Review and prospect of supersonic business jet design

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