A Roots rotary lobe positive discplacement blower, or PD blower, is a machine that "pushes" a relatively constant volume of the gas handled at the inlet through the discharge. It doesn't internally compress the gas, so it isn't considered a compressor. The amount of gas the machine handles is fixed by the configuration of the casing and rotating parts.
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Flow through a PD machine is relatively constant, regardless of pressure changes. This is different from a centrifugal compressor, which maintains a relatively constant pressure while the flow varies.
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As the dual, figure-8 shaped impellers rotate, a fixed quantity of gas (or air) at the inlet is trapped between the impeller and the casing parts. With each revolution, four of these "pockets" of gas are trapped, then forced out the discharge against whatever pressure exists in the system.
When each of these pockets is expelled, a pulse is generated, which imposes a certain shock load on the blower and the downstream system. A ROOTS improvement on the basic PD design is the Whispair Blower. It lets the gas in the pocket pressurize slowly to discharge conditions via the internal "jets." This significantly reduces pulsations and shock load on the equipment.
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