Abstract
An adventitious flow field has a great impact on the operational reliability of pumps; therefore, it is important to study pump flow characteristics to reduce the noise, vibration, and cavitation performance of pumps. To study the pressure fluctuation characteristics of the hose pump, a three-dimensional two-way fluid structure coupling model of the hose pump was established. The transient structural module, fluid flow (fluent) module, and system coupling module of ANSYS Workbench 19.0 were used to simulate the unsteady multiple working conditions of the hose pump. The accuracy and reliability of the calculation results from the fluid solid coupling simulation were verified via experimentation. The results show that the roller pass frequency is the main frequency of the pressure fluctuation at the outlet of the hose pump. When the plane of the deformation recovery area is small, the pressure pulsation amplitude is large, and the outlet pressure and speed are large. Due to the irregular backflow of the fluid, stall zones of different sizes form, the outlet pressure is closer to a sinusoid when there is no pressure. The higher the rotating speed is, the faster the pressure roller leaving the hose, the higher the pressure pulsation, and the larger the stall zone. Therefore, the best way to reduce the pressure pulsation in the pump is to optimize the geometry of the pressure roller and change the outlet angle of the hose.
Highlights
Hose pumps are widely used in wastewater and dirt treatment, the chemical industry, the food industry, brewing, the sugar manufacturing industry, the paper and ceramic industry, the construction industry, and the mining industry [1]
The squeezed pump pipe in the pump head forms a pillow-like shape between the two rollers, which is usually called a “pillow” [3]
When one end of the pillow is about to flow out of the pump head, because the previous roller has lost pressure on the pump pipe [5], the recovery deformation of the pump pipe makes a part of the liquid flow back to the recovery deformation area of the pump pipe, so the liquid in the pump pipe is not at a constant velocity flow [6,7], and it changes periodically
Summary
Hose pumps are widely used in wastewater and dirt treatment, the chemical industry, the food industry, brewing, the sugar manufacturing industry, the paper and ceramic industry, the construction industry, and the mining industry [1]. To accurately describe the model behaviour of the hose pump, it is necessary to combine the fluid model with a solid model because fluid flow is caused by pipe extrusion. Most of the research on the pulsation of hose pumps is based on a comparison between theoretical calculations and experiments and proposes that the existence of pulsation affects the flow rate. To simulate the actual flow of fluid in the rubber hose of the hose pump, it is necessary to establish a turbulence model, and the fluid is described in an arbitrary Lagrange Eulerian (ALE) framework. The ρs parameter is the density, the E parameter is the Young’s modulus, the V parameter is the Poisson ratio, the C10 parameter weights the deformation of the body, the D1 parameter weights the effect of compressibility along the motion, the α parameter is the mass damping coefficient and β is the stiffness damping coefficient. The parameter is the density, the E parameter is the Young’s modulus, the V parameter is the Poisson ratio, the C parameter weights the deformation of the body, the D parameter weights the effect of compressibility along the motion, the parameter is the mass damping coefficient and is the stiffness damping coefficie6not.f 20
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