Abstract
Pumps are energetic devices that are present in a wide range of industries. Their installed power varies from a few tens of watts up to hundreds of megawatts. As the energy consumption is connected with global warming and climate change, the development of pumps that have good characteristics is very important. Theoretical and experimental methods have long been utilized in the development of pumps, but recently much research has been carried out with the help of Computational Fluid Dynamics (CFD) analysis. Certain numerical analyses can be of high quality and accurate, but special operational phenomena still occur, where special attention is required when performing analysis. This category includes operating regimes outside the Best Efficiency Point (BEP), the formation of inlet recirculation, cavitation, and the influence of wall roughness on all the above characteristics. The current paper presents the main problems that developers face when numerically analyzing the above-mentioned special operating regimes. Both numerical and experimental results are considered.
Highlights
Pumps are used in all branches of industry
Pumps are major energy consumers and special attention needs to be paid to their development phase
As numerical methods are increasingly used in the development of pumps, development engineers are facing various problems
Summary
Pumps are used in all branches of industry. Depending on the different requirements for the basic characteristics of the head (H) and the flow rate (Q), piston pumps [1] or centrifugal pumps [2] are used. It was necessary to analyze specific properties that are rarely discussed in the literature One such example is the consideration of wall roughness, which may be due to different influences in the operation of the pumps [4]. To the best of our knowledge, there is no literature relevant to the link between roughness and the use of a suitable turbulent model with a proper computational grid In such cases, certain studies need to be performed for fairly fundamental properties, such as boundary layer flow analysis [5]. The numerical analysis results presented in this paper are the result of the author's many years of research in the field of centrifugal pump development
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