Affiliation:
1. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, China
2. College of Mechanical Engineering, Nantong University, Nantong, China
Abstract
In order to study the shaft system vibration of mixed-flow pump under rotor–stator interaction, the unsteady pressure fluctuation characteristics are measured and the rotor axis orbit obtained based on the Bentley 408 data acquisition system. The relationship between pressure fluctuation and vibration characteristics of shaft system at the blade passing frequency is analyzed. The results show that the pressure fluctuation amplitude is the largest and the rotor–stator interaction effect is the most obvious in the middle of the impeller. Along the direction of the main stream, the velocity energy is converted into pressure energy, the rotor–stator interaction effect is gradually weakened, and the main frequency of the pressure pulsation gradually turns from the 4 X frequency to the 1 X frequency of the impeller rotation frequency. The hydraulic stirring vibration and other factors lead to jagged sharp corners on the original axis orbit. The axis orbit of 1 X frequency is an ellipse with little difference between long and short axis while the 2 X frequency is the opposite, from which the existence of arcuate rotary whirl and misalignment phenomenon of the rotor can be judged. Combined with time–frequency characteristics of pressure pulsation, it can be found that the hydraulic imbalance has a great influence on the vibration of the shafting, while the rotor–stator interaction at the blade passing frequency takes the second place, which is the main factor of inducing the 4 X frequency vibration of the axis orbit. This study targets is that providing practical guidance for improving operation stability and preventing the vibration failure of the mixed-flow pump.
Funder
Key R&D Program Projectof Zhenjiang
Natural Science Foundation of Jiangsu Province
National Key R&D Program Project
Science and Technology Support Program of Changzhou
PAPD, Six Talents Peak Project of Jiangsu Province
Scientific Research Start Foundation Project of Jiangsu University
Key R&D Program Project in Jiangsu Province
National Natural Science Foundation of China
Subject
Mechanical Engineering,Geophysics,Mechanics of Materials,Acoustics and Ultrasonics,Building and Construction,Civil and Structural Engineering
Cited by
14 articles.
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