Actions for Laser velocimetry measurements in the cavity of HF chemical laser (cavity injector type CL-II).

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Laser velocimetry measurements in the cavity of HF chemical laser (cavity injector type CL-II).

Author
Hackett, C. E.
Published
United States : [publisher not identified], 1977.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1977.
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
Efforts to develop a non-invasive optical technique that permits measurement of gas/particle velocity distributions within the actual lasing zone of an operational continuous wave combustion driven HF chemical laser device are summarized. The results were obtained for the cavity injector type CL-II. Data were obtained from at least five cavity injector elements for a streamwise range from 3 to 16 intranozzle separation distances, using a scanning Fourier Transform laser velocimeter system to measure the velocity of TiO/sub 2/ particles formed by a chemical condensation technique inside the mixing layers between the cavity injector elements. The statistical features of the data ensembles have been analyzed by a computer to obtain both velocity probability distributions and the first four statistical moments of the particle velocity distribution at various locations within the intranozzle mixing layers. Comparative studies using cone pitot-static and two component hot-wire anemometry measurements in analog non-reacting flows have been included for reference. The results indicate that chemical laser cavity flows can be probed using a scanning Fourier Transformed laser velocimeter system and a Lagrangian chemical seeding technique. The spatial resolution is not small enough to study the fine-scale structure of the gas-mixing regions. The measured bimodal particle velocity probability distributions are ambiguous, either because the gas dynamics of the flow itself is unsteady, or the gas-particle kinematics exhibit features that indicate unmixed conditions in the intranozzle shear flow.
Report Numbers
SAND-76-9314
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: EY-76-C-04-0789
OSTI Identifier 7292823
Research organization: Sandia Labs., Albuquerque, NM (USA).
View MARC record | catkey: 47075973