Flow-tagging velocimetry for hypersonic flows using fluorescence of nitric oxide

Danehy, Paul M.; O’Byrne, Sean; Houwing, A. F. P.

doi:10.2514/6.2001-302

Cited by 28 publications

(34 citation statements)

References 15 publications

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“…Nitric oxide can, for example, be used to study effects of boundary layers using flow-tagging velocimetry 38 or rapid flow dynamics using burst-mode laser systems. 39 Atomic species, such as hydrogen and oxygen, can be excited by two-photon absorption where ultra-short laser pulses are advantageous due to the combination of high peak powers and moderate pulse energy, boosting signal to noise and minimizing photochemical interferences.…”

Section: Laser-induced Fluorescencementioning

confidence: 99%

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Ehn

Zhu

et al. 2017

Appl Spectrosc

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Gaining information of species, temperature, and velocity distributions in turbulent combustion and high-speed reactive flows is challenging, particularly for conducting measurements without influencing the experimental object itself. The use of optical and spectroscopic techniques, and in particular laser-based diagnostics, has shown outstanding abilities for performing non-intrusive in situ diagnostics. The development of instrumentation, such as robust lasers with high pulse energy, ultra-short pulse duration, and high repetition rate along with digitized cameras exhibiting high sensitivity, large dynamic range, and frame rates on the order of MHz, has opened up for temporally and spatially resolved volumetric measurements of extreme dynamics and complexities. The aim of this article is to present selected important laser-based techniques for gas-phase diagnostics focusing on their applications in combustion and aerospace engineering. Applicable laser-based techniques for investigations of turbulent flows and combustion such as planar laser-induced fluorescence, Raman and Rayleigh scattering, coherent anti-Stokes Raman scattering, laser-induced grating scattering, particle image velocimetry, laser Doppler anemometry, and tomographic imaging are reviewed and described with some background physics. In addition, demands on instrumentation are further discussed to give insight in the possibilities that are offered by laser flow diagnostics.

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Section: Laser-induced Fluorescencementioning

confidence: 99%

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Ehn

Zhu

et al. 2017

Appl Spectrosc

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“…This strategy has been shown to predict measured freestream velocities to within 5% [10][11][12]. To further validate the freestream parameters, 2-d-axisymmetric CFD simulations using the commercially available Ansys Fluent code including a custom implementation of the Landau-Teller model were conducted additionally.…”

Section: Influence Of Molecular Vibrational Energy Accommodation Modementioning

confidence: 99%

Influence of Molecular Vibrational Energy Accommodation Modeling on Cone Surface Heat FLUX at Mach 10

Hruschka¹,

Sauerwein²

2016

JEPE

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Abstract:In order to assess the influence of high vibrational temperatures typically found in shock-tunnel-generated flows on model surface heat flux, measurements are compared to simulations using the DSMC (direct simulation Monte Carlo) method. The two limiting cases of either full accommodation of molecular vibrational energy to the surface temperature or none at all are simulated for three shock tunnel conditions using Nitrogen (N 2 ) as a test gas. The conditions mainly differ by an order of magnitude in density, however, all three comparisons to the corresponding measurements suggest that vibrational surface relaxation happens only to a small extent. While model surface pressure is not affected, heat fluxes differ by up to 20%, depending on the modelling. Furthermore, lower flow densities generally lead to higher differences.

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“…Another advantage of using PLIF for flow visualization is that it is relatively easy to perform velocimetry in hypersonic flows if a PLIF flow visualization is already being performed. 16 …”

Section: Introductionmentioning

confidence: 99%

Visualization of a Capsule Entry Vehicle Reaction-Control System (RCS) Thruster

Danehy

Wilkes

Brauckmann

et al. 2006

44th AIAA Aerospace Sciences Meeting and Exhibit

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Flow-tagging velocimetry for hypersonic flows using fluorescence of nitric oxide

Abstract: We investigate a new type of flow-tagging velocimetry technique for hypersonic flows.

Cited by 28 publications

References 15 publications

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Influence of Molecular Vibrational Energy Accommodation Modeling on Cone Surface Heat FLUX at Mach 10

Visualization of a Capsule Entry Vehicle Reaction-Control System (RCS) Thruster

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