Combined holographic interferometer and Laser-Schlieren system applied to high temperature, high velocity flows

The High Enthalpy tunnel in Goettingen (HFG) is operated by the German Aerospace Research Establishment. Nominal test conditions of a free stream Mach number of 10, reservoir enthalpies of up to 23 MJ/kh and reservoir pressures of up to 100 MPa make the HEG ideal to study the 'hot' entry p...

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Bibliographic Details
Main Authors: Kastell, Dirk, Eitelberg, Georg
Format: Conference Proceeding
Language:English
Subjects:
Flow visualization
High temperature operations
Holograms
Interferometers
Lasers
Mathematical models
Signal to noise ratio
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Summary:The High Enthalpy tunnel in Goettingen (HFG) is operated by the German Aerospace Research Establishment. Nominal test conditions of a free stream Mach number of 10, reservoir enthalpies of up to 23 MJ/kh and reservoir pressures of up to 100 MPa make the HEG ideal to study the 'hot' entry phase of space vehicles. For the flow visualization in the HEG, a holographic interferometer with a 300 mm field of view is set up. This method enables computerized evaluation of the holograms to create high quality interferograms by increasing the signal to noise ratio. Complete flow field density gradient around two dimensional models can be calculated from the interferograms. However, the exact localisation of the shocks is difficult. To overcome this lack, Laser-Schlieren system is used to obtain simultaneous interferometric and Schlieren information.
ISSN:0730-2010