Visualization for a free jet by a laser induced fluorescence method and its structure
Abstract
Visualized free jets by an I2-Ar ion-laser induced fluorescence (LIF) method are shown and their features are explained qualitatively in connection with the flow properties of the flow medium and of the seeded I2. The LIF represents the jet structure very well except for helium jets. It is shown that striped patterns of LIF in the supersonic region of the jet result from the Doppler shift of the rovibronic absorption lines of I2 due to the flow velocity component in the direction of the laser beam and that the flow velocity can be determined from the observed inclination of the strips. It is also shown that the intensity of the LIF depends strongly on the rotational temperature of I2.
- Publication:
-
Institute of Space and Astronautical Science Proc. of the Symp. on Mech. for Space Flight
- Pub Date:
- March 1984
- Bibcode:
- 1984isas.proc...51T
- Keywords:
-
- Absorptivity;
- Flow Visualization;
- Fluorescence;
- Free Jets;
- Laser Induced Fluorescence;
- Rare Gas-Halide Lasers;
- Supersonic Flow;
- Argon;
- Doppler Effect;
- Flow Velocity;
- Iodine Lasers;
- Irradiation;
- Molecular Rotation;
- Temperature Dependence;
- Fluid Mechanics and Heat Transfer