Advanced Flow Diagnostic Tools (2nd Edition)

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: 30 April 2025 | Viewed by 647

Special Issue Editor

1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
Interests: supercritical fluids; advanced measurement techniques; energy; multiscale transport phenomena
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Special Issue Information

Dear Colleagues,

The turn of the century has seen tremendous progress in flow diagnostic tools as a result of the even more staggering improvement in optical illumination, detection devices, as well as data processing techniques. For instance, advances in laser-based optical methods over the last 40 years, including PIV, LDA, PSP/TSP, PLIF, FLEET, Rayleigh Scattering, etc., have made major breakthroughs in the analysis of complex flows containing shock waves, strong expansions, shear layers, vortex organizations, and recirculation regions. There are still many other advanced flow diagnostic technologies that have emerged in aerodynamics and have been widely used in the automobile, aircraft, propulsion, and turbomachinery industry. Although those methods are still under development, they are also opening new possibilities for the measurement and analysis of flow fields that seem too difficult (or even impossible) to achieve using conventional techniques.

This Special Issue will be a collection of contributions that reflect the latest efforts in the development and application of advanced and/or novel flow diagnostic tools with potential applications (or directly linked) to wind tunnel and flight tests, combustion flow, multiphase flow, heat transfer flow, etc. Suitable topics include but are not limited to:

  • Laser-based optical measurement techniques;
  • Flow visualization techniques;
  • Non-intrusive measurement of pressure, skin friction, heat transfer, and deformation at the surface;
  • Advanced measurement methods of aerodynamic forces and moments (magnetic suspension balance and cryogenic balance);
  • Flow diagnostic tools under extreme conditions (ultra-high-speed, low/high temperature; space condition, etc.);
  • Advanced data processing methods for flow diagnostic tools.

Dr. Lin Chen
Guest Editor

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Keywords

  • laser-based optical methods
  • surface flow visualization
  • transition detection
  • microfluidics/nanofluidics
  • combustion flow
  • multiphase flow
  • wind tunnel and/or flight tests
  • heat transfer flow
  • boundary layer
  • compressible flow

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Published Papers (1 paper)

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Research

16 pages, 16959 KiB  
Article
Application of High-Speed Self-Aligned Focusing Schlieren System for Supersonic Flow Velocimetry
by Philip A. Lax and Sergey B. Leonov
Aerospace 2024, 11(8), 603; https://doi.org/10.3390/aerospace11080603 - 24 Jul 2024
Viewed by 459
Abstract
A self-aligned focusing schlieren (SAFS) system combines the field of view of a conventional schlieren system with the defocus blur of a focusing schlieren system away from the object plane. It can be assembled in a compact form, measuring 1.2 m (4 ft) [...] Read more.
A self-aligned focusing schlieren (SAFS) system combines the field of view of a conventional schlieren system with the defocus blur of a focusing schlieren system away from the object plane. It can be assembled in a compact form, measuring 1.2 m (4 ft) in length in the described case. The depth of field is sufficiently shallow to distinguish specific spanwise features in a supersonic flow field within a 76.2 mm (3 in) wide test section. As a result, the boundary-layer perturbations on windows and window-material defects and surface imperfections are blurred. Analytical forms are derived for depth of field and vignetting of the SAFS system. A laser spark velocity measurement in Mach 2 flow is performed by tracking the blast wave of a laser spark using 500 kHz SAFS imaging with a 200 ns optical pulse width. The flow Mach number and stagnation temperature are measured by comparing the blast-wave dynamics to an analytical solution. Additionally, schlieren image velocimetry is performed by analyzing natural flow perturbations in 500 kHz SAFS images using a self-correlation method. Comparing the spectra of gas density perturbations from the core flow and a near-wall region reveals a significant difference, with high-frequency prevalence at the boundary-layer location. Full article
(This article belongs to the Special Issue Advanced Flow Diagnostic Tools (2nd Edition))
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