Regenerative blowers, also called side-channel blowers, are momentum pumps that utilize the shape of the impeller to add more energy to the fluid. The design allows for a continuous flow out of the pump. The impeller has equally spaced vanes on both sides of the rim which allows for the fluid to enter in between them. The pressure of the fluid increases inside of the pump which forces most of the air out of the exhaust. Some of the air goes back to the inlet side and mixes with new air that has entered. When the air enters, it gets trapped in between the vanes, it behaves in a helical shape which gives it the regenerative aspect and allows for better efficiency and performance. A huge benefit is that regenerative blowers do not require as much maintenance as other pumps. The impeller does not contact the casing so there is no wear in that area and they do not require oil.
Regenerative blowers are commonly used for air filtration as they have increased flow rates at low pressures when compared to other pumps. Anytime large volumes of air have to be moved, regenerative blowers are great options. Some examples include sewage filtration, dust removal, and pond aeration. Another use is when engraving or cutting material because small particles are likely to scatter. Regenerative blowers produce a significant amount of heat which can be beneficial for drying purposes. Caution must be taken because the pumps can be damaged if any solids or liquids enter inside. Solids could potentially get lodged in between the impeller and casing which can be resolved by installing a filter near the inlet. Also, a water removal device might be needed if the working fluid is steam.