Multi-Property Measurements at High Sampling Rates Using Rayleigh Scattering

Autor:	Chih-Jen Sung, Kristie A. Elam, Amv F. Mielke
Rok vydání:	2009
Předmět:	Photomultiplier Jet (fluid) Materials science business.industry Nozzle Aerospace Engineering Temperature measurement Physics::Fluid Dynamics symbols.namesake Interferometry Optics Particle image velocimetry symbols Rayleigh scattering business Choked flow
Zdroj:	AIAA Journal. 47:850-862
ISSN:	1533-385X 0001-1452
DOI:	10.2514/1.37369
Popis:	A molecular Rayleigh scattering technique is developed to measure gas velocity, temperature, and density in unseeded gas flows at sampling rates up to 32 kHz. A high-power continuous-wave laser beam is focused at a point in an air flowfield, and Rayleigh scattered light is collected and fiber-optically transmitted to a Fabry-Perot interferometer for spectral analysis. Photomultiplier tubes operated in the photon-counting mode allow highfrequency sampling of the total signal level and the circular interference pattern to provide density, temperature, and velocity measurements. Mean and root-mean-square fluctuation measurements in both an electrically heated jet facility with a 10-mm-diam nozzle and in a hydrogen-combustor-heated-jet facility with a 50.8-mm-diam nozzle at NASA John H. Glenn Research Center at Lewis Field are presented. Measurements are compared with hot-wire anemometry, cold-wire thermometry, and temporally resolved particle image velocimetry to validate the Rayleigh technique.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1b1a77b38b697f97c80976797722d1f7 https://doi.org/10.2514/1.37369 Zobrazit plný text záznamu