Time-average measurement of velocity, density, temperature, and turbulence velocity fluctuations using Rayleigh and Mie scattering
| Autor: | Jayanta Panda, Kristie A. Elam, Richard G. Seasholtz, Amy F. Mielke |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics business.industry Turbulence Mie scattering Astrophysics::Instrumentation and Methods for Astrophysics Computational Mechanics General Physics and Astronomy Light scattering Physics::Fluid Dynamics symbols.namesake Interferometry Optics Thermal velocity Mechanics of Materials symbols Group velocity Rayleigh scattering business Choked flow |
| Zdroj: | Experiments in Fluids. 39:441-454 |
| ISSN: | 1432-1114 0723-4864 |
| DOI: | 10.1007/s00348-005-0990-8 |
| Popis: | Measurement of time-averaged velocity, density, temperature, and turbulence velocity fluctuations in sparsely seeded gas flows using a non-intrusive, point-wise technique based on Rayleigh and Mie scattering is discussed. A Fabry-Perot interferometer (FPI) is used to spectrally resolve laser light scattered by molecules and particulates in gas flows. The spectral content of the scattered light provides information about velocity, density, and temperature of the gas. A CCD camera is used to record images of the fringes formed by scattered light passing through the interferometer. Models of the spectral components are used in a least squares fitting routine to estimate the parameters from fringe images. Flow measurements are presented for subsonic and supersonic jet flows. The application range for this technique is mostly for high velocity situations (>25 m/s). Velocity, density, temperature, and turbulence velocity fluctuations were determined with accuracies within 5 m/s, 4%, 2%, and 5 m/s, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink