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Density measurement of supersonic airflow using decay characteristics of FLEET emission

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Abstract

A method that involves the use of a femtosecond laser can be utilized for nonintrusive measurement of supersonic airflow without seeding any additional molecules. In the present study, the feasibility of using this method to measure the density in supersonic airflows is investigated. In the experiments, a laser filament is created in underexpanded jets by focusing a femtosecond laser through a lens. Emission from nitrogen molecules in the laser filament is called femtosecond laser electronic excitation tagging (FLEET) emission. The signal of FLEET emission is detected by a CCD camera with an image intensifier changing the time delay after a laser pulse to obtain the data of decay in FLEET emission. The time constant characterizing the FLEET emission lifetime is estimated from the emission decay data and the constant is converted to the density based on the model proposed in the previous study. The densities measured by the present method are compared with those computed based on the Navier–Stokes equations. The results reveal that the densities in supersonic airflows can be measured with the accuracy of ± 11% under the conditions that the densities and the density gradients along the laser filament are less than 0.18 kg/m3 and 540 kg/m4, respectively.

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Funding

This work was partly supported by JSPS KAKENHI Grant Number JP22H01406.

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Authors and Affiliations

  1. Department of Advanced Science and Technology, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku-Ku, Nagoya, Aichi, 468-8511, Japan

    Wakako Yamaguchi & Taro Handa

  2. Aviation Technology Directorate, Japan Aerospace Exploration Agency, Chofu, Tokyo, 182-8522, Japan

    Yosuke Sugioka & Shunsuke Koike

Authors
  1. Wakako Yamaguchi
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  2. Yosuke Sugioka
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  3. Shunsuke Koike
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  4. Taro Handa
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Contributions

WY analyzed the experimental and computational results. YS constructed the optical system and edited the manuscript. SK guided the research and edited the manuscript. TH guided the research and wrote the main manuscript text. All of the authors conducted the experiments.

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Correspondence to Taro Handa.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Yamaguchi, W., Sugioka, Y., Koike, S. et al. Density measurement of supersonic airflow using decay characteristics of FLEET emission. Exp Fluids 64, 190 (2023). https://doi.org/10.1007/s00348-023-03738-0

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  • DOI: https://doi.org/10.1007/s00348-023-03738-0

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