Pulse-Burst PIV in a High-Speed Wind Tunnel

Beresh, Steven J.; Wagner, Justin L.; Henfling, John F.; Spillers, Russell Wayne; Pruett, Brian Owen Matthew

doi:10.1007/978-3-319-44866-4_114

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…This current work is part of a series of recent efforts, composed of joint high-resolution experiments and high-fidelity simulations, to understand the unsteady dynamics of strong, swept, 3-D STBLIs. These thrusts have been prompted by several recent advances in massively parallel simulations (Poggie, Bisek & Gosse 2015) as well as time-resolved unsteady measurements of high-speed flows (Beresh et al 2015) and other novel measurement techniques (Fahringer & Thurow 2018). The effort combines experimental measurements of the SCR (Vanstone et al 2016(Vanstone et al , 2018 and SF (Baldwin et al 2016;Jones et al 2017;Arora et al 2018) interactions, along with high-fidelity large-eddy simulations (Adler & Gaitonde 2017, 2018b, 2019a of both configurations.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of strong swept-shock/turbulent-boundary-layer interactions

Adler

Gaitonde

2020

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 99%

Dynamics of strong swept-shock/turbulent-boundary-layer interactions

Adler

Gaitonde

2020

J. Fluid Mech.

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“…A custom-modified Spectral Energies QuasiModo pulse-burst laser 48 operating at 532 nm is utilized. Compared with previous work using this laser 39 , a higher-energy pulsed seed laser, software modifications, beam expansions, and reduced pulse durations were needed to enable 5 MHz operation without damage to optics. In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, only a single snapshot could be captured per experiment and the fundamental high-speed dynamics could not be measured. With recent developments in pulse-burst laser technologies 21,37,38 , innovations in laser diagnostics at high repetition rates [39][40][41][42] , and advancements in ultra-high-speed camera designs 43 , it is now feasible to develop new techniques for ultra-high-speed PCDIH. Flashlamp-pumped pulse-burst lasers, however, have notoriously poor beam quality making them appear to be unacceptable for both coherent imaging and four-wave-mixing.…”

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confidence: 99%

Megahertz-rate shock-wave distortion cancellation via phase conjugate digital in-line holography

et al. 2020

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Holography is a powerful tool for three-dimensional imaging. However, in explosive, supersonic, hypersonic, cavitating, or ionizing environments, shock-waves and density gradients impart phase distortions that obscure objects in the field-of-view. Capturing time-resolved information in these environments also requires ultra-high-speed acquisition. To reduce phase distortions and increase imaging rates, we introduce an ultra-high-speed phase conjugate digital in-line holography (PCDIH) technique. In this concept, a coherent beam passes through the shock-wave distortion, reflects off a phase conjugate mirror, and propagates back through the shock-wave, thereby minimizing imaging distortions from phase delays. By implementing the method using a pulse-burst laser setup at up to 5 million-frames-persecond, time-resolved holograms of ultra-fast events are now possible. This technique is applied for holographic imaging through laser-spark plasma-generated shock-waves and to enable three-dimensional tracking of explosively generated hypersonic fragments. Simulations further advance our understanding of physical processes and experiments demonstrate ultra-high-speed PCDIH techniques for capturing dynamics.

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“…It was proved that using this solution significantly improved the light scattering compared to micron-sized droplets. The authors of Reference [ 22 ] used a pulse-burst laser as part of a time-resolved PIV method. This made it possible to visualize the flow under high-speed and turbulence conditions.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Flow Field Generated by Multicopter Propellers

Czyż¹,

Karpiński

Stryczniewicz

2020

Sensors

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This paper presents the results of research on the airflow around a multirotor aircraft. The research consisted of the analysis of the velocity field using particle image velocimetry. Based on the tests carried out in a wind tunnel, the distribution of the velocity and its components in the vertical plane passing through the propeller axis were determined for several values of the angle of attack of the tested object for two values of airflow velocity inside the tunnel, i.e., vwt = 0 m/s and vwt = 12.5 m/s. Determining the velocity value as a function of the coordinates of the adopted reference system allowed for defining the range of impact of the horizontal propellers and the fuselage of the research object itself. The tests allowed for quantitative and qualitative analyses of the airflow through the horizontal rotor. Particular attention was paid to the impact of the airflow and the angle of attack on the obtained velocity field distributions.

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Pulse-Burst PIV in a High-Speed Wind Tunnel

Cited by 5 publications

References 5 publications

Dynamics of strong swept-shock/turbulent-boundary-layer interactions

Dynamics of strong swept-shock/turbulent-boundary-layer interactions

Megahertz-rate shock-wave distortion cancellation via phase conjugate digital in-line holography

Measurement of the Flow Field Generated by Multicopter Propellers

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