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Abstract: In order to obtain the relationship between the changes of base circle radius on#br# three-lobe Roots blower and the blower performance, first the influence of blower rotor involutes#br# from the changes of base circle radius is analyzed from the perspective of geometric principles,#br# and the available range of involute base circle radius is given as well as its influence of area#br# utilization factor. Then based on the numerical analysis method, the blower internal pressure field,#br# the vortex intensity variation and the inlet mass flow rate changes under the same rotor type and#br# different base circle radius are calculated by the dynamic mesh technique. Simulation results show#br# that: the increase of the same kind of rotor type involute base circle radius can weaken the vortex#br# strength and speed, increase inlet mass flow, and improve efficiency of the Roots blower. The#br# blower manufacturer should therefore choose a larger involute base circle radius.#br# Key words: numerical analysis; three-lobe Roots blower; involute; dynamic mesh; base#br# circle radius
