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Shock-wave-detection technique for high-speed rarefied-gas flows

Akhlaghi, H ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.2514/1.J055819
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2017
  4. Abstract:
  5. This paper introduces a shock-wave-detection technique based on the schlieren imaging for continuum and rarefied-gas flows. The scheme is applicable for any existing two-dimensional flowfields obtained by experimental or numerical approaches. A Gaussian distribution for a schlieren function within the shock-wave region is considered. This enables the authors to access any desired locations through the shock (e.g., shock center, or leading- and trailing-edge locations). The bow shock-wave profile is described via a rational function, which could be employed for the estimation of shock angle. The relation between pre- and postshock flow properties along the shock wave with a high resolution can be investigated by using this technique. The technique is verified in a novel way based on the well-known gas dynamics curves (i.e., flow-deflection angle vs shock angle and shock polar diagrams). High-speed continuum, near continuum, and rarefied-gas flows over a wedge and cylinder are considered for evaluation of the proposed technique. The results show a very good agreement with existing analytical relations for continuum flow. Copyright © 2017 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved
  6. Keywords:
  7. Flow of gases ; Gas dynamics ; Gases ; Rational functions ; Signal detection ; Analytical relations ; Deflection angles ; Flow properties ; High resolution ; Numerical approaches ; Rarefied gas flow ; Schlieren imaging ; Shock wave detection ; Shock waves
  8. Source: AIAA Journal ; Volume 55, Issue 11 , 2017 , Pages 3747-3756 ; 00011452 (ISSN)
  9. URL: https://arc.aiaa.org/doi/10.2514/1.J055819