Laser Doppler velocimetry in chemical laser studies
Abstract
An experimental investigation of the gas kinematics in the mixing zone downstream of various supersonic nozzle arrays for use in chemical laser systems was conducted in the Chemical Laser Laboratory of the Air Force Weapons Laboratory (AFWL). The design considerations and experimental application of a scanning laser Doppler velocimetry (LDV) system for use in this investigation is reported. The problem of dielectric seeding of the low density supersonic gas streams was addressed and was in part circumvented by Lagrangian condensation reaction techniques. The LDV system incorporated a servo-driven scanning feature which enabled the Doppler sensing region to be swept in planes parallel to the face of the mixing nozzle array. Results were compared to hot-wire anemometry, and are found to be satisfactory.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1974
- Bibcode:
- 1974STIN...7512311H
- Keywords:
-
- Chemical Lasers;
- Laser Doppler Velocimeters;
- Doppler Effect;
- Hot-Wire Anemometers;
- Kinematics;
- Test Equipment;
- Lasers and Masers