Plasma Laboratory - Weizmann Institute of Science

Z-pinch PLIF results

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PLIF measures the gas profiles quickly and with high signal-to-noise ratio and spatial resolution. It enables the studying of the flow trajectory, azimuthal symmetry of the density, turbulence in the flow, and fine structures due to shell-on-shell interactions. Mapping of Both r – z and r – θ planes can be obtained by orientating the laser sheet perpendicular to the gas flow direction, and placing the camera accordingly.

Fig. ‎1: PLIF image of a double gas-puff (cylindrical shell around an on‑axis jet) nozzle.

Fig. ‎2: CCD PLIF image of a triple gas-puff, taken at 404 µs with respect to the pin trigger. Pressures in all valve plena were set to 24.4 psia. Both fluorescence and phosphorescence can be seen.

Fig. 3: ICCD PLIF image of a triple gas-puff, taken 412 µs with respect to the pin trigger. Pressures in all valve plena were set to 34 psia. Horizontal lines of varying intensity, due to imperfections in the planar sheet, are seen. Also seen is a gradual decrease in intensity from top to bottom.

Fig.4 : CCD PLIF images of the r – θ plane a triple gas-puff, taken at ~416 µs with respect to the pin trigger at z = 2 mm. (a) Three images taken with the laser sheet covering different regions of the gas-puff; (b) The images are stitched together to show the entire density profile; (c) For reference, a picture of the nozzle is given.


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Modified on: 2010-05-23

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