Numerical and experimental study on the pressure fluctuation, vibration, and noise of multistage pump with radial diffuser

Abstract

Multistage pump can provide high-pressure liquid, which is widely used in various areas of national economy. In order to improve the stability and reduce the noise of multistage pump, the relationships among the pressure fluctuation, vibration, and noise were studied deeply by using computational fluid dynamics and experimental measurement. Based on the unsteady numerical calculation, the phase of the pressure fluctuation wave in the middle section of the impeller and the diffuser was obtained, and the unsteady velocity distribution was acquired in the rotor-stator interaction (RSI) region between the rotational impeller and the stationary diffuser. Moreover, the vibration and noise tests of a five-stage pump with radial diffuser were performed. The results show that the phase distribution of the pressure fluctuation wave in the impeller and diffuser can be divided into four regions: the impeller flow channel region, the impeller transition region, the diffuser transition region, and the diffuser flow channel region. In addition, the pressure fluctuation, vibration and noise of the multistage pump are strongly related to each other, that is, RSI induces strong unsteady flow and pressure fluctuation in the pump, which makes the pump produce serious vibration and cause the corresponding noise. The key to controlling the vibration and noise is to reduce the effect of RSI between the impeller and the diffuser.

Numerical and experimental study of the self‐priming process of a multistage self‐priming centrifugal pump

“…Such pump is extremely suitable for situations with frequent start‐ups or difficult liquid irrigations . Multistage self‐priming centrifugal pump is a type of drainage and irrigation equipment with high‐head and high‐pressure liquid that was developed on the basis of a single‐stage self‐priming centrifugal pump …”

“…[11][12][13][14][15] Multistage self-priming centrifugal pump is a type of drainage and irrigation equipment with high-head and high-pressure liquid that was developed on the basis of a single-stage self-priming centrifugal pump. [16][17][18][19][20][21][22] Self-priming performance is an important performance parameter in multistage self-priming centrifugal pumps, and self-priming is a kind of complicated gas-water twophase flow phenomenon, so computational fluid dynamics (CFD) is often used to simulate the self-priming process of self-priming centrifugal pumps. Based on ANSYS CFX software, Liu et al 23 simulated the self-priming process of a single-stage self-priming centrifugal pump by using an unsteady numerical method, and the selfpriming time was estimated.…”

Fault Diagnosis Method for Hydraulic Directional Valves Integrating PCA and XGBoost

“…In particular, the hydraulic valve is the core control component of the hydraulic system, and it is widely used in numerous engineering applications to control the flow and pressure of fluids [4][5][6]. In the hydraulic system, a vibration analysis (VA) is the most popular and efficient condition monitoring technique for rotating systems including the hydraulic pump, electric motor, bearing, and more [7][8][9][10][11][12][13][14][15][16]. However, the working process of the valve core of the hydraulic valve is a reciprocating motion.…”

Influence of Critical Wall Roughness on the Performance of Double-Channel Sewage Pump

“…It is well known that pumps have huge energy consumption, and wall roughness has an important effect on pump efficiency [11][12][13][14][15][16]. In the process of using the double-channel sewage pump, the abrasion of the wall surface caused by the impurities in the transport medium and the damage of the blade surface caused by erosion will cause the change of the wall roughness, and roughness Ra is one of the important factors affecting the performance of the pump.…”