Schlieren Visualization of the Energy Addition by Multi Laser Pulse in Hypersonic Flow

Oliveira, Antônio Carlos de; Minucci, M. A. S.; Toro, Paulo; Chanes, J. B.; Myrabo, Leik N.; Pakhomov, Andrew V.

doi:10.1063/1.2931909

Cited by 2 publications

(8 citation statements)

References 6 publications

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“…More importantly, flow instability becomes more pronounced as the pulse frequency increases [287] nevertheless, further increasing the frequency is found to dampen unsteadiness [258]. Similarly, increasing the time between successive pulses yields an unsteady behavior due to fore shock wave recovery [267].…”

Section: Factors Controlling the Energy Deposition Devices Effectivenessmentioning

confidence: 93%

“…The replacement of the conventional bow fore shock with a system of weaker shock as well as the low-pressure recirculation zone downstream of a rarefied gas channel act to reduce the drag on the forebody [247,248,252]. Instability of the flowfield around the forebody can take place with both continuous [261,265,266] and pulsed energy deposition [267,268] devices.…”

Section: Ac Electric Discharge 31%mentioning

confidence: 99%

“…Later, various studies were devoted to explore the structure of the flowfield due to pulsed energy deposition. Of these, the authors recommend the experiments of Oliviera et al [267], Sasoh et al [293], and Adelgren et al [260], the numerical simulations of Joarder et al [294], and the combined work of Schülein et al [295]. As for flowfield structure associated with continuous energy deposition devices, the authors recommend the experimental work of Schülein et al [296] and Satheesh, Jagadeesh [254].…”

Section: Survey On Key Studies On Energy Deposition Devicesmentioning

confidence: 99%

“…In addition, the comprehensive numerical work of Takaki and Liou [239] includes a comprehensive parametric study on a drag and aeroheating reduction of a generic energy source in Mach 14 freestream. As for flow instability associated with energy deposition devices, the readers are encouraged to refer to the studies by Oliviera et al [267], Schülein et al [265], Erdem et al [266], and Ohnishi et al [268].…”

Section: Survey On Key Studies On Energy Deposition Devicesmentioning

confidence: 99%

“…The most active research groups in the field of energy deposition devices are the following. The group of Myrabo conducted a set of experimental and combined experimental-simulation studies [247,256,267,271,282,297] with AC electric discharge devices applied to blunted forebodies in Mach 3 and 10 conditions. Flowfield structure, wall pressure, and drag were concerned.…”

Section: Survey On Key Studies On Energy Deposition Devicesmentioning

confidence: 99%

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Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Ahmed

Qin

2020

Progress in Aerospace Sciences

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One key feature that distinguishes the flowfield around vehicles flying in supersonic and hypersonic regimes is the bow shock wave ahead of forebody. The severe drag and aeroheating impacting these vehicles can be significantly reduced if the bow shock wave ahead of the vehicles forebodies is controlled to yield weaker system of oblique shocks. Benefits of forebody shock control include increasing flight ranges, economizing fuel consumption, reducing dead weights, and thermally protecting forebody structure and onboard equipment. Forebody shock control that has been widely studied since the early 1900s is achievable in numerous techniques that vary according to the mechanism of control. While some of these techniques have already been implemented in real systems, other techniques involve serious complications and tough trade-offs. The present paper is intended to serve as the first comprehensive survey on the field of forebody shock control devices. The objectives of the present paper are multifold. The paper categorizes the various forebody shock control devices in a physics-based manner, explains the underlying physics for each device, and surveys the key studies and state-of-the-art knowledge. The paper also addresses the existing gaps in knowledge, highlights the existing systems implementing these devices, and discusses the associated practical implementation issues and design-tradeoffs. 2. Structural devices, the mechanical spikes: 2.1. Principle of operation of mechanical spikes Drag and Aeroheating Reduction Devices Fluidic Devices Opposing jets Structural Devices Mechanical spikes Energetic Devices Energy deposition Basic devices Structural-Fluidic Devices Structural-Energetic Devices Hybrid devices

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Section: Factors Controlling the Energy Deposition Devices Effectivenessmentioning

confidence: 93%

Section: Ac Electric Discharge 31%mentioning

confidence: 99%

Section: Survey On Key Studies On Energy Deposition Devicesmentioning

confidence: 99%

Section: Survey On Key Studies On Energy Deposition Devicesmentioning

confidence: 99%

Section: Survey On Key Studies On Energy Deposition Devicesmentioning

confidence: 99%

See 3 more Smart Citations

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Ahmed

Qin

2020

Progress in Aerospace Sciences

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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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Schlieren Visualization of the Energy Addition by Multi Laser Pulse in Hypersonic Flow

Cited by 2 publications

References 6 publications

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

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

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