Measurement for void fraction distribution of high-speed water jet by laser tomography technique
- Conference date: 17–19 September 2011
- Location: Tianjin, China
In this study, the Laser tomography method was applied to measure the void fraction distribution of the highspeed water jet in radial and axial direction. The continuous Laser beam emitted by Nd:YAG green laser (wavelength is 532nm, beam diameter is 0.2mm) is introduced into the water jet normally to the flow direction. The laser beam is emitted toward the photo detector, which is located at the opposite side. The photo detector can detect the time-averaged transmissivity of the laser beam passing across the cross section of the jet. By traversing the laser and photo detector on radial direction, we can get the time-averaged transmissivity distribution in radial direction. From this transmissivity distribution data, we can reconstruct the local transmissivity distribution by the tomography method. By using this technique, the void fraction distribution of extreme high speed water jet can be evaluated.
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