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Abstract
Tumbling Multi-Chamber (TMC) gear pump is a generally unknown type of hydraulic device, which features a unique three-dimensional shape of the gears. The main benefits of such design over the conventional gear pumps are self-adapting tightness of the pump parts, the possibility to mold the parts from a polymer material and high volumetric efficiency, considering the simplicity of the design. The specific working principle of TMC pumps requires a slightly different approach to the numeric modeling and analysis process compared to the conventional gear pump types (e.g. external gear and gerotor pumps). One of the main contributions of the work is the development of an analysis procedure, which allows studying flow and pressure conditions in the TMC pump. This includes the influence of the positioning of the pump parts on spatial and temporal variations in sealing regions and the influence of pressure field propagation in relation to the valve plate position.
Highlights
Positive displacement (PD) pumps often feature twodimensional shapes for simple design and reliable operation
The basic concepts of the Tumbling Multi-Chamber (TMC) pump technology are not unknown, as they are comprehensively described in the documents by Wildhaber (1966, 1974), Arnold (1993) and in the related documents. In addition to these documents, we have found no publicly available scientific reports about TMC pumps
Range of the shaft speed was between 1100 and 7400 rpm. 60 measurements were acquired for each operating point with the sample rate of 2 Hz
Summary
Positive displacement (PD) pumps often feature twodimensional shapes for simple design and reliable operation. ISM method allows the simulation of the motion of solid objects inside of the fluid region without the need for mesh deformation or remeshing. A prevailing part of numerical researches was done with the usage of algorithms, which deform structured hexahedral grids in each step of the simulation. For this purpose, different approaches were used. Gerotor pump was a topic of the research by Castilla et al (2017), who avoided the remeshing process with the combination of deforming mesh method and OpenFOAM solver. We reviewed options for TMC pump CFD modeling and developed the numerical model of the TMC pump with the usage of automatic grid generation method. The fourth section begins with mesh sensitivity analysis, continues with a display of flow-related data and concludes with revealing of pressure conditions together with the visualization of sealing regions
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