Research on unsteady flow and noise characteristics in centrifugal pumps
In order to improve the performance and vibration noise control objectives of marine centrifugal pumps,and optimize the stealth cruise capability of ships.A marine pump test bench was built to measure and analyze the pump per-formance,pressure pulsation and flow noise under different working conditions.The accuracy of the numerical algorithm was verified through comparative tests and numerical calculation results.The shear stress,turbulent kinetic energy,pressure pulsation,flow resistance and flow-induced noise characteristics of marine pump were analyzed by combining CFD-FEM method.The results show that the wall shear stress and turbulent kinetic energy at the blade outlet are larger,the friction res-istance in the 1/3 region at the blade outlet is larger,and the pressure pulsation has an obvious peak value at the blade fre-quency and its frequency doubling,showing obvious discrete characteristics.The internal field noise exhibits wideband char-acteristics throughout the entire frequency band,and the sound pressure level decreases with the increase of frequency.The sound pressure level energy is higher in the frequency band less than 1 000 Hz,and the characteristic peak value can be ob-served at the blade frequency(241.7 Hz)and its frequency doubling.The total sound pressure level decreases first and then increase with the increase of flow rate.
NETL
NSTL
万方数据
