Numerical Investigation Of Flow-Induced Noise On Interior Sound Field In Helic-Axial Multiphase Pump

As one of the most important equipments in oil field exploitation,helic-axial multiphase-pump has a very broad application prospect in multiphase transportation.The flow-induced noise characteristics of the pump have an important impact on the safe and stable operation of the system.Reducing the flow-induced noise is an important measure to control the noise radiating by pipeline facilities.Based on the self-designed YQH-100 axial-flow miltiphase pump,the flow field and internal acoustic field of the pump are studied by STT turbulence model and acoustic boundary element method.The flow field,pressure pulsation and flow-induced noise characteristics are analyzed in order to provide reference for flow-induced noise control of the pump.The main contents and achievements of this paper are as follows:1.Hydraulic design,three-dimensional modeling,meshing and numerical calculation of YQH-100 multiphase pump with given parameters are carried out.The results show that the pump head,efficiency and other performance parameters meet the design requirements,demonstrating the rationality of hydraulic design.2.The steady and unsteady flow characteristics of the pump were analyzed,the results show that the complex flow phenomena such as recirculation and whirlpool exist in the guide vane,and the flow field state is improved with the increase of flow rate;the pressure gradient in the rotor and stator interaction region between impeller and guide vane is larger;the rotor and stator interaction between impeller and guide vane is an important factor affecting the pressure pulsation characteristics of the pump.The characteristic frequency of pressure pulsation in the flow field is impeller blade frequency and its times.The pressure pulsation in the guide vane is related to the number of impeller blades and the rotating speed of the pump.Compared with the rotor-stator coupling in the compression stage,the coupling between stages is more intense.With the increase of flow rate,the flow state in the compression stage of is gradually enhanced by the rotor-stator interaction between the impeller and the guide vane,while the influence of rotational speed is gradually weakened,but the flow state at the inlet of the first impeller is greatly affected by the rotational speed.3.Flow-induced noise in impeller,guide vane and volute are calculated separately.The results show that among the three flow passage components,the flow-induced noise by impeller is the largest,the flow-induced noise by guide vane is the second,and the flow-induced noise by volute is the smallest.The impeller flow-induced noise takes the axis frequency as the periodic fluctuation,and the obvious fluctuation amplitude appears at the impeller blade frequency;the fluctuation amplitude of the guide blade flow-induced noise mainly manifests at the guide blade frequency,theimpeller blade frequency and its times frequency;the volute flow-induced noise mainly manifests in the middle and high frequency band of the guide blade frequency,which is affected by the rotating speed of the pump,the number of impeller blades and the number of guide blades.4.The radiation characteristics of flow-induced noise by impeller,guide vane and volute under different gas fraction were analyzed.The results show that the influence of gas fraction on flow-induced noise is consistent,and the sound pressure level of flow-induced noise decreases gradually with the increase of gas fraction.