By means of mathematical modelling the features of an outflow of high-velocity pulsating jets out of chambers of gas-detonation installations intended for handling materials are investigated. The boundary value problem is reduced to a solution of an inhomogeneous wave equation with allowance for pressure variation on the boundary of the pulsed source. The calculation of gas-dynamic fields of velocities and pressures is carried out, the volumetric density of potential and kinetic energies and its concentration on the surface under treatment are defined.