Analytical Model for the Flow in Progressing Cavity Pump with the Metallic Stator and Rotor in Clearance Fit

Zheng, Lei; Wu, Xiaodong; Han, Guoqing; Li, Huachang; Zuo, Yi Y.; Zhou, Dake

doi:10.1155/2018/3696930

Cited by 13 publications

(9 citation statements)

References 24 publications

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“…According to [2], [11], and [13] two flow components determine the amount of backflow through the sealings. The first component arises due to the relative velocity between rotor and stator.…”

Section: Rotor-stator Interactionmentioning

confidence: 99%

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Müller

Kouhi

Leonow

et al. 2021

Journal of Petroleum Science and Engineering

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This contribution studies the impact of the rotor-stator interaction in a single-stage progressing cavity pump on the flow rate and pressure. Specifically, we investigate the effect of the rotor movement on the sealings formed with deformable stators for various speeds and pressures. Sealings are reconstructed with the help of a geometric 3D model. We analyze the tangential and radial deviation of the rotor from its reference path and show that the radial deviation affects the flow rate, whereas the tangential deviation affects the pressure dynamics. The conjectures are confirmed with a laboratory test setup.

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Section: Rotor-stator Interactionmentioning

confidence: 99%

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Müller

Kouhi

Leonow

et al. 2021

Journal of Petroleum Science and Engineering

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“…These network models are robust, fast, and easy to understand. Most require calibration to experimental data or numerical simulation, although Zheng et al (2018) have recently developed a promising technique for estimating laminar flow resistance directly from geometry. This section discusses different strategies that can estimate the resistance of the sealing lines.…”

Section: Network Modelsmentioning

confidence: 99%

Geometrically Calibrated Network Models for Progressive Cavity Pump Design

Simon

Slocum

2020

SPE Journal

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Summary Linear network models are promisingly simple progressive cavity pump design tools. Current linear network models are difficult to use in the design process because they require calibration against experimental data or computationally intensive simulation. In this paper we present new approaches for implementing linear network progressive cavity pump models and provide new methods to accurately and quickly estimate the values of each resistor in the model from pump geometry for both laminar and turbulent flows. This paper also argues that sealing-line flow transitions from laminar to turbulent at orders of magnitude smaller Reynolds numbers than described in the literature thus far. We propose a new hypothesis for the point of transition to turbulent performance.

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“…What are the characteristics of vibration and modal changes caused by the eccentric loading during rice threshing? is has attracted the attention and interest of many scholars [3,4]. e load state of the threshing cylinder has been investigated many years ago [5].…”

Section: Introductionmentioning

confidence: 99%

Variation and Modal Characteristic of Tangential Threshing Cylinder Undergoing Threshing Dynamics

Tang

Wang

Zhang

et al. 2020

Mathematical Problems in Engineering

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During the rice-threshing process, straws always attached to a threshing cylinder and induced vibration and modal variation. In this paper, the constraint and threshing modals of the threshing cylinder were tested under idling and load conditions, and the causes of vibration and modal variation were explained. Based on the constraint and modal of the threshing cylinder, the vibration amplitudes and frequencies undergoing rice threshing were tested and analyzed. Results showed that mass of straws decreased gradually with the separation of rice grains and straws. And there was a nonuniform change in the circumferential resistance of the threshing cylinder. The fluctuating torque, speed, and frequencies during threshing process would cause vibration of the threshing cylinder. During rice-threshing process, the other natural frequencies were greater than the excitation frequency. With the accumulation of a large amount of straws, the threshing modal frequencies of the tangential threshing cylinder increased. The threshing bars caused vibration of the tangential threshing cylinder in the left and right direction mainly at two frequencies. At idling state of no-load, the vibration frequency 42.97 Hz of the tangential threshing cylinder in X direction was close to the constraint modal frequency 41.58 Hz. The eccentric load caused the excitation frequency to increase during the rice-threshing process. The vibration frequency was also closely related to the threshing modal. The tangential threshing cylinder with low vibration characteristics could be designed by using the eccentric vibration characteristics during the threshing process.

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Analytical Model for the Flow in Progressing Cavity Pump with the Metallic Stator and Rotor in Clearance Fit

Cited by 13 publications

References 24 publications

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Modeling pressure pulsation and backflow in progressing cavity pumps with deformable stator

Geometrically Calibrated Network Models for Progressive Cavity Pump Design

Variation and Modal Characteristic of Tangential Threshing Cylinder Undergoing Threshing Dynamics

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