Title :
On the development of Doppler global velocimetry for cryogenic wind tunnels
Author :
Willert, C. ; Stockhausen, G. ; Klinner, J. ; Beversdorff, M. ; Quest, J. ; Jansen, U. ; Raffel, M.
Author_Institution :
Inst. of Propulsion Technol., German Aerosp. Center, Koln, Germany
Abstract :
A specially designed Doppler global velocimetry system (DGV, planar Doppler velocimetry) was tested in a high-speed cryogenic facility at Mach 0.3 to Mach 0.8 and pressures between 1.2 and 2.5 bar. The necessary seeding was achieved by injecting a mixture of gaseous nitrogen and water vapor into the dry and cold tunnel flow which then immediately formed a large amount of small ice crystals. As operational and access conditions are quite restrictive with respect to other facilities, DGV is currently considered the best choice for the non-intrusive measurement of flow fields. A comparison of DGV to the more wide-spread particle image velocimetry technique (PIV) is also given.
Keywords :
Doppler measurement; Mach number; cryogenics; flow measurement; laser velocimetry; wind tunnels; 1.2 to 1.5 bar; Mach number; cryogenic wind tunnels; gaseous nitrogen; ice crystals; nonintrusive measurement; particle image velocimetry; planar Doppler global velocimetry; tunnel flow; water vapor; Aerodynamics; Aerospace testing; Aircraft; Circuit testing; Cryogenics; Nitrogen; Optical scattering; Propulsion; System testing; Temperature;
Conference_Titel :
Instrumentation in Aerospace Simulation Facilities, 2003. ICIASF '03. 20th International Congress on
Print_ISBN :
0-7803-8149-1
DOI :
10.1109/ICIASF.2003.1274846
