Abstract
Underexpanded supersonic gas‐particle jets were experimentally studied by the shadowgraph technique in order to examine the influence of the dispersed phase on the shape of the free jet and the structure of the shock waves. It was found that the Mach disc moves upstream towards the orifice with increasing particle loading. Since this observation was in opposition to the results obtained by numerical simulations, further experiments were conducted in which the particle velocity along the jet centerline was measured by a modified laser‐Doppler anemomenter. These measurements revealed, that the particles move considerably slower than the gas flow at the nozzle exit.
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