By virtue of an actual blower as example, following conclusions are obtained.Firstly amplitude of inflow flow pulsation of three leaves Roots blowers is less than that of two leaves Roots blowers.

• 给出理论流量、实际流量的计算方法，计算的生产实例表明，三叶罗茨风机比两叶罗茨风机的进气流量脉动小；