FLEET velocimetry measurements in the ONR-UTA arc-jet wind tunnel

Gopal, Vijay; Palmquist, Daniel; Maddalena, Luca; Dogariu, Laura; Dogariu, Arthur

doi:10.1007/s00348-021-03306-4

Cited by 8 publications

References 39 publications

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Diagnostics of plasma–liquids systems: Challenges and their mitigation

Yatom

2023

Physics of Plasmas

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This article will review two popular methods of laser diagnostics in a plasma–liquid system and generally in low-temperature plasmas. These are Thomson scattering and laser-induced fluorescence. Setting up the plasma–liquid interaction experiment will be described while stressing the important points for laser diagnostics and maintaining conditions for correct and repeatable measurements. I will discuss the caveats that are encountered when measuring an inherently unstable and collisional system, such as plasma interacting with the liquid and how these challenges impact that data analysis and calibration efforts for these two-diagnostic approaches.

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Diagnostics of plasma–liquids systems: Challenges and their mitigation

Yatom

2023

Physics of Plasmas

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Resonant-enhanced multiphoton ionization of nitric oxide (NO) tagging velocimetry in a detonation-driven hypersonic shock tunnel

Chen,

Luo,

Wang

et al. 2024

Physics of Fluids

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This Letter demonstrates the use of long-lifetime NO fluorescence for molecular tagging velocimetry (MTV) with (1 + 1) resonant-enhanced multiphoton ionization (REMPI) scheme, utilizing a single laser beam in a detonation-driven hypersonic shock tunnel. The Q1 branch of the NO A←X (0, 0) transition was excited using radiation near 226.256 nm. It was determined that (1 + 1) REMPI of NO generates long lifetime fluorescence, and this observation is consistent with the findings reported by Jiang et al. [Opt. Lett. 49, 1297–1300 (2024)] and Leonov et al. [Opt. Lett. 49, 426–429 (2024)]. Single-shot tagged lines at microsecond delay times were obtained in a Ma6.9 hypersonic freestream flow using a long focal length lens. The measured average velocity of 3477 m/s agrees well with the simulation result.

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Tomographic FLEET with a wedge array for multi-point three-component velocimetry

Richardson,

Zhang,

Beresh

2024

Opt. Lett.

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Femtosecond laser electronic excitation tagging (FLEET) velocimetry is an important diagnostic technique for seedless velocimetry measurements particularly in supersonic and hypersonic flows. Typical FLEET measurements feature a single laser line and camera system to achieve one-component velocimetry along a line, although some multiple-spot and multiple-component configurations have been demonstrated. In this work, tomographic imaging is used to track the three-dimensional location of many FLEET spots. A quadscope is used to combine four unique views onto a single high-speed image intensifier and camera. Tomographic reconstructions of the FLEET emission are analyzed for three-component velocimetry from multiple FLEET spots. Glass wedges are used to create many (nine) closely spaced FLEET spots with less than 10% transmission losses. These developments lead to a significant improvement in the dimensionality and spatial coverage of a FLEET instrument with some increases in experimental complexity and data processing. Multiple-point three-component FLEET velocimetry is demonstrated in an underexpanded jet.

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FLEET velocimetry measurements in the ONR-UTA arc-jet wind tunnel

Cited by 8 publications

References 39 publications

Diagnostics of plasma–liquids systems: Challenges and their mitigation

Diagnostics of plasma–liquids systems: Challenges and their mitigation

Resonant-enhanced multiphoton ionization of nitric oxide (NO) tagging velocimetry in a detonation-driven hypersonic shock tunnel

Tomographic FLEET with a wedge array for multi-point three-component velocimetry

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