Abstract
Two new molecular-based diagnostic methods show great promise for the measurement of turbulence in variable density, low-speed flow fields. The first of these methods is Rayleigh imaging, which is capable of capturing two-dimensional instantaneous cross sections of the flow field density. Through the use of atomic or molecular filters in front of the camera, Rayleigh imaging can be extended to the measurement of temperature and velocity. Flow tagging yields velocity profiles in variable density flow fields and can be used to measure the details of the turbulent structure. These two techniques may be applied simultaneously to capture instantaneous velocity and density fields with high resolution.
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Miles, R.B., Lempert, W.R., Forkey, J., Finkelstein, N.D., Harris, S.R. (1997). Optical Diagnostics for Flows with Density Variations. In: Fulachier, L., Lumley, J.L., Anselmet, F. (eds) IUTAM Symposium on Variable Density Low-Speed Turbulent Flows. Fluid Mechanics and Its Applications, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5474-1_31
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DOI: https://doi.org/10.1007/978-94-011-5474-1_31
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