Influence of Screw Centrifugal Inducer on Internal Flow Structure of Vortex Pump

Quan, Hui; Cheng, Jing; Guo, Ying; Kang, Lei; Peng, Guoyi

doi:10.1115/1.4047229

Cited by 20 publications

(8 citation statements)

References 9 publications

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“…e power transmission system and transmission mode of the combine harvester are shown in Figure 1. e unbalanced vibration of these rotating parts will cause serious vibration of the whole machine to affect its stability [25,26]. In addition, the mutual coupling between the rotating bodies will also cause the unbalanced response in the system to be more complicated [27].…”

Section: Mathematical Modeling Of Parallel Multicylindersmentioning

confidence: 99%

Vortex Trajectory of Rotating Shaft Undergoing Vibration Coupling of Parallel Multicylinders

Zhang

Tang

et al. 2022

Advances in Materials Science and Engineering

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Multiple threshing cylinders of combine harvester are mainly driven in parallel, whose transmission methods are complex causing the excitations coupled with each other. The mutual excitation coupling of multiple threshing cylinders causes a severe vibration state of the combine harvester with poor stability. In order to analyze the influence of transmission system coupling on the unbalanced response of the parallel multicylinder system, this paper established a mathematical model of the parallel multicylinder system and derived the general vortex trajectory expression of the unbalanced response of threshing cylinder shaft undergoing vibration coupling of parallel multicylinders. Vibration tests of the bearing seat and the rotating shaft were carried out for comparison and verification. Results showed that the existence of the transmission chain and the transmission mode cause the boundary conditions of the multicylinder system to change, which ultimately led to changes in the unbalanced response of the transmission system. The contribution rate of different transmission methods and rotation speeds to the vibration amount at the fundamental frequency of the multicylinder was 5% to 30%. The existence of the transmission system caused the vibrations of the various units to be coupled with each other, mutually transmitted, and superimposed, leading to changes in the vortex shape of the rotating shaft and the unbalanced response of the transmission system.

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Section: Mathematical Modeling Of Parallel Multicylindersmentioning

confidence: 99%

Vortex Trajectory of Rotating Shaft Undergoing Vibration Coupling of Parallel Multicylinders

Zhang

Tang

et al. 2022

Advances in Materials Science and Engineering

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“…e basic parameter that describes turbulence is turbulent kinetic energy (TKE), an important parameter that characterises the intensity of turbulent motion and maintains the development and attenuation of turbulence [25,26]. Its increase causes an increase in liquid energy loss and a decrease in pump head and efficiency, increasing rotatory machinery failure [27,28].…”

Section: Turbulent Energy Distribution In Impellermentioning

confidence: 99%

Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump

Huang

Liu

Wang³

et al. 2020

Shock and Vibration

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An increase in internal pressure of a Roto-Jet pump is due to combined action of its impeller and rotating casing. Internal pressure of the pump chamber was determined according to outlet pressure of the impeller, and the influence of the rotary casing effect was ignored. To study the combined action mechanism of the rotating casing effect and impeller structure on the Roto-Jet pump, we used the open test bed of the Roto-Jet pump and four model pumps with impellers of different structures as research objects. We also conducted a comprehensive experimental study on the coupling mechanism between the rotating casing effect and impeller structure. Numerical calculation was performed to avoid the assumption of isotropic eddy viscosity, Reynolds stress linear pressure-strain model is selected, and the numerical calculation results are compared with the experimental results to verify its credibility. The results show that the rotating casing effect has multiple functions to reduce the friction loss of the disc, improve the pressure distribution inside the rotating casing, and increase the pump head. All scheme, pressure, and velocity fluctuations occur in the upstream and wake regions of the collecting pipe and the energy loss is concentrated in the upstream region. The difference in velocity distribution inside the collecting pipe is small and negligible. As long as the impeller and rotating casing continue to rotate synchronously, the liquid shear velocity at the same coordinate position of each scheme remains unchanged, and the liquid rotation angular velocity in the rotating casing is approximately 75% of the rotating casing which conforms to the rigid motion law. In the same scheme, the coefficient of uneven velocity inside the rotating casing gradually increases along the radial direction. The closer to the axis, the faster is the decrease of the peak tangential velocity and the velocity tends to be uniform. The size, shape, and position of the vortex core inside the rotating casing change constantly with various schemes. The distribution of vortex cores varies under each scheme. The front cover and rotating casing have a serious effect on the vortex core. The extremely poor analysis of the test results shows that the performance of the Roto-Jet pump is better when the closed impeller is rotated in synchronisation with the rotating casing. The advantages and disadvantages of each blade type can be determined according to the situation. The research results can exhibit the influence mechanism of the Roto-Jet pump shell effect. Selection of an impeller structure provides a reference.

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“…e threshing drum is a typical rotating machine. ere are many researches on the basic motion [5,6] and vibration response [7][8][9] of rotating machines in the engineering field. Establishment of dynamic system equations is the basis for studying the vibration characteristics.…”

Section: Introductionmentioning

confidence: 99%

Bearing Seat Vibration Modes Undergoing Unbalanced Excitation of Multirotating Drums

Tang

Wang

et al. 2021

Shock and Vibration

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Transmission modes of multiple rotating parts on combine harvester are complex and diverse, which resulted in large vibration and poor stability when the entire machine is harvesting. Aiming at the complex vibration problem of the combine harvester threshing system, this paper established the dynamic response model of the multidrum parallel system under different transmission modes and solved the vibration characteristics of the system. An experiment on the axial unbalance response of the parallel drum system under different transmission modes was carried out. The results show that the internal units of the threshing system form a whole through the transmission system, which causes the unbalanced response of the system to be superimposed on parallel threshing drums, thereby increasing the vibration amplitude. In addition, the change of the transmission mode will cause the vibration transmission path in the system to change greatly, and the boundary conditions of the system will be changed at the same time, which will eventually lead to the change of the unbalanced response characteristics.

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Influence of Screw Centrifugal Inducer on Internal Flow Structure of Vortex Pump

Cited by 20 publications

References 9 publications

Vortex Trajectory of Rotating Shaft Undergoing Vibration Coupling of Parallel Multicylinders

Vortex Trajectory of Rotating Shaft Undergoing Vibration Coupling of Parallel Multicylinders

Coupling Mechanism of Rotating Casing Effect and Impeller Structure of Roto-Jet Pump

Bearing Seat Vibration Modes Undergoing Unbalanced Excitation of Multirotating Drums

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