Kazuyasu Matsuo

Quantitative Flow Visualization of Correctly Expanded Supersonic Jets by Rainbow Schlieren Deflectometry

A quantitative visual study of a correctly-expanded supersonic jet of a Mach number of 1.6 by the rainbow schlieren deflectometry has been conducted to reveal the jet flow field quantitatively. Rainbow schlieren images of the jet have been taken by a schlieren system with a rainbow filter which has a continuous hue distribution. The density contour plot of the jet flow is determined by using the image analysis based on the Abel inversion of experimental data of transverse displacement at the cut-off plane. Also, Pitot probe measurements at a jet cross-section have been carried out to obtain density profiles. The radial distribution of the density from the schlieren quantitatively agrees well with that from the Pitot probe.

Measurements in Overexpanded Supersonic Jets by Rainbow Schlieren Deflectometry

A visual study of an overexpanded supersonic jet issuing from an axisymmetric convergent-divergent nozzle by the rainbow schlieren deflectometry technique has been conducted to reveal the shock containing jet flow field quantitatively. Rainbow schlieren images of the jet have been taken by a schlieren system with a rainbow filter which has a continuous hue distribution. The density contour plot of the jet flow is determined by using the image analysis based on the Abel inversion of experimental data of transverse displacement at the cut-off plane. Leading and rear shocks as well as a Mach disk in the jet flow are clearly visible in the density contour plot of the jet. Also, the density ratio across the Mach disk obtained from the experiment shows an excellent agreement with the theoretical value across a normal shock wave quantitatively.