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The term pulse combustion originates from the intermittent (pulse) combustion of gaseous fuel in the pulse combustion engine, in contrast to continuous combustion in conventional burners. Such periodic combustions generate intensive pressure, velocity, and to a certain extent, temperature waves propagating from the pulse combustion unit through a tailpipe (a diffuser) to the process volume of the drying chamber. In order to excite enhanced pulsation in the drying chamber, the operating frequency of the pulse combustor engine must match the frequency of one of the natural acoustic (dynamic) modes of the process volume . When this condition is satisfied, the pulsations are in resonance and the process is resonance-driven.