On the basis of analysis of physical regularities of change of hydrodynamics of blown system of composition of layer components in dense blown layer there are established regularities of development of pressure change in flow of pulsating blast with specified frequency of pulsations. Theoretically, the main regularities of pressure change are determined, both in the pulsator and in the object of influence of periodic fluctuations of gas flow supply. Theoretically, the main regularities of pressure change are determined, both in the pulsator and in the object of influence of periodic fluctuations of gas flow supply. Features of change of force effects on the object of pulsating flow are shown as the sum of intermediate time effects, which are able to provide increase of gas filtration rate through the bed nozzle with reduction of its gas-dynamic resistance.