Trip-induced Transition Measurements in a Hypersonic Boundary Layer Using Molecular Tagging Velocimetry

Bathel, Brett F.; Danehy, Paul M.; Jones, Stephen B.; Johansen, Craig T.; Goyne, Christopher P.

doi:10.2514/6.2013-42

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…This technique requires a tunable and narrow linewidth pulsed 226 nm laser source. Recently, commercial Nd:YAG laser-pumped 226 nm dye lasers have been commonly used in the NO-PLIF [7][8][9]. However, these systems are usually expensive and complex.…”

Section: Introductionmentioning

confidence: 99%

Single-frequency laser pumped optical parametric oscillator at 226 nm

2019

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We demonstrate a narrow linewidth optical parametric oscillator (OPO), with a 452 nm signal radiation output, pumped by a 355 nm single frequency Nd:YAG laser. The pump laser can operate with a precisely controllable laser pulse firing time and so can the OPO output. The OPO is composed of two beta barium borate crystals and arranged in a linear cavity configuration. The cavity is not actively stabilized. The maximum output pulse energy achieved for the 452 nm signal is 11 mJ with a 45 mJ pump energy. The spectrum and spatial shape are measured to be in accordance with the pulse characteristics of a narrow linewidth laser. It is shown that the signal pulse is extremely dependent on the pump pulse. Then the signal pulse is frequency doubled to generate about 1.5 mJ in energy of ultraviolet radiation at 226 nm.

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Section: Introductionmentioning

confidence: 99%

Single-frequency laser pumped optical parametric oscillator at 226 nm

2019

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Entropy Effect in Laminar-Turbulent Transition of the Supersonic Boundary Layer in the Wake of an Isolated Roughness

Chuvakhov

2020

Fluid Dyn

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Review of Fluorescence-Based Velocimetry Techniques to Study High-Speed Compressible Flows

Bathel

Johansen

Inman

et al. 2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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This paper reviews five laser-induced fluorescence-based velocimetry techniques that have been used to study high-speed compressible flows at NASA Langley Research Center. The techniques discussed in this paper include nitric oxide (NO) molecular tagging velocimetry (MTV), nitrogen dioxide photodissociation (NO 2 -to-NO) MTV, and NO and atomic oxygen (O-atom) Doppler-shift-based velocimetry. Measurements of both singlecomponent and two-component velocity have been performed using these techniques. This paper details the specific application and experiment for which each technique has been used, the facility in which the experiment was performed, the experimental setup, sample results, and a discussion of the lessons learned from each experiment. Nomenclature

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Trip-induced Transition Measurements in a Hypersonic Boundary Layer Using Molecular Tagging Velocimetry

Cited by 3 publications

References 13 publications

Single-frequency laser pumped optical parametric oscillator at 226 nm

Single-frequency laser pumped optical parametric oscillator at 226 nm

Entropy Effect in Laminar-Turbulent Transition of the Supersonic Boundary Layer in the Wake of an Isolated Roughness

Review of Fluorescence-Based Velocimetry Techniques to Study High-Speed Compressible Flows

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