Measurement of gas velocity in a high-gradient flow, based on velocity of tracer particles

Methods of reconstruction of the gas flow velocity from the measured velocity of disperse phase particles are considered. It is demonstrated that available approaches are limited by the low velocity nonequilibrium of the phases. A method of correction of particle image velocimetry (PIV) data on the basis of measuring the parameters of velocity relaxation of particles is proposed for measuring the gas velocity in high-gradient flows. The method is experimentally tested in the flow behind a shock wave with submicron tracers. A possibility of using this method in flows with gas-dynamic discontinuities is demonstrated.