Analysis of pressure fluctuation characteristics of rear stator pumpjet propulsor
Based on the improved delayed separation vortex model,the numerical simulation of the transient flow field of the post-stator pumpjet propulsor was carried out,and the maximum error between the calculated thrust value and the ex-perimental value was 4.68％,which verified the reliability of the numerical simulation.The time-frequency domain character-istics of the pressure fluctuation near the flow field of the pumpjet propulsor are analyzed,and the distribution laws of the surface pressure coefficient and the time-average value of the sound pressure fluctuation of the rear stator under multiple working conditions are studied.The results show that the pressure pulsation in the pumpjet propulsor is mainly affected by the rotor,the pulsation period is consistent with the rotor rotation period,and the peak value in the frequency domain ap-pears in the low frequency band and is an integer multiple of the passing frequency of the rotor blades;the rear stator bal-ances the work area of the rotor torque It is concentrated at the leading edge of the stator,and its contribution gradually de-creases along the chord direction.The position of about 1.8％of the stator chord length at the trailing edge has almost no con-tribution to the balance torque;the leading edge is the main contributor to the stator noise.As the secondary contribution source of the stator noise,the contribution of the trailing edge to the stator noise gradually decreases with the decrease of the advance speed coefficient.
万方数据
维普
