The paper raises the question of the possibility of reducing the energy loss of the stage of the centrifugal pump on the disk friction, the relative value of which for the stages of low and ultralow speed can be a significant proportion (up to 40%) of all losses. This is seen as one of the effective ways to increase the efficiency of such stages of centrifugal pumps.
The manuscript presents the results of a numerical study of a centrifugal contra rotating blade system based on a low-speed impeller (ns = 65). They were carried out to assess the possibility of using a contra rotating blade mesh operating in conjunction with a standard centrifugal impeller as a method of intensifying the transmission of energy to a fluid. The designs of the systems under consideration and their pressure and energy characteristics are presented.
The paper analyzes the negative impact of technogenic civilization on the development of a human as integrity. The conceptual position of the research is the transdisciplinary idea that a human as integrity is one with all his/her conditions, with the whole world. Giving preference only to the external conditions of a human associated with technical progress led to his/her decline andself-destruction as integrity.The purpose of an investigation consists in showing the reasons of the destruction of human integrity today. Particular attention is paid to the analysis of the modern conditions of human existence associated with the processes of globalization and rapid, negative changes in all spheres of the life of a society in a state of total crisis. It is noted that such conditions chaotize the internal processes of a human, “split” him/her as integrity, destroy the harmonization with other people.Filled with doubts, lacking development prospects and goals, such a human, like the whole society, loses the future.It is concluded that today the human situation is critical. It is necessary to immediately reorient all spheres of life of the society towards human development, harmonization of all his/her essential aspects as integrity. Changes in the public policy, human rights legislation, education and science must be a priority. It is noted that the key role in overcoming the modern anthropological crisis belongs to scientists who, using the EU experience, are able to create a new scientific field for polylogy and the search for optimal ways out of the situation. The transdisciplinary approach, which is actively developed by European transdisciplinary schools and centers, is particularly productive. This approach overcomes the gap between the subject and the object of cognition, between man and the world, and forms a new worldview of man in a new society. Such possibilities of the transdisciplinary approach fully correspond to the tasks of modern universities.
In the work on the basis of objective laws on the development of technical systems and the features of the VI technological order directions of further development of pump technical systems are analyzed. The reserves of systems that already exist without changing the principle of the working process are shown, the concept of "combined working process" is introduced and the question of the necessity and possibility of searching for fundamentally different physical processes of liquid power transfer, including at the micro level, is raised.
The reliability of pumping units at nuclear power plants (NPPs) is critical in terms of their energy efficiency and safety. Remarkably, WWER-1000 reactors at Ukrainian NPPs are equipped with outdated pumping units that have already served their full-service life. This fact leads to an urgent need to develop a new, more efficient pump. In the article, a promising pump, ACNA 600-35, was developed. It was designed to increase the energy efficiency of pumps TX 800/70/8-K-2E, applied at the holding pool and the industrial circuit of the nuclear reactor. Since these pumps should be imported from the monopoly suppliers, this affects both the energy efficiency of pumping equipment and the energy independence of Eastern Europe. The proposed pump ACNA 600-35 is characterized by an increased efficiency of up to 0.12–0.13 compared with the TX 800/70/8-K-2E pump. In general, the life cycle cost of the proposed pump is 15–20% lower than for the analog TX 800/70/8-K-2E. The design of the developed pump ACNA 600-35 and the related pumping unit based on its production at industrial facilities allows for further development of the industrial and fuel-energy complex, increasing the state’s energy independence and employment. According to expert estimates, the average economic effect from supplying the developed pump can reach 10 mln USD/year.
Developing ways to increase centrifugal pumps’ pressure and power characteristics is a critical problem in up-to-date engineering. There are many ways to resolve it, but each has advantages and flaws. The presented article aimed to ensure higher energy efficiency indicators by using a counter-rotating pumping stage with trimming. During the research, the comprehensive approach was based on CFD modeling and the Moore–Penrose pseudoinverse approach for overestimated systems. According to the obtained data, pumps with a counter-rotating stage allowed the pressure head to be significantly increased compared with the standard design of the flow part. Notably, for pumping units CPS 180/1900 with a basic stage, the pressure head of 127 m was reached. However, when using a counter-rotating stage, the pressure head could be increased up to 270 m, which was 2.1 times higher. Therefore, to ensure unchanged characteristics when using centrifugal pumps with the counter-rotating stage, the weight and size indicators can be significantly reduced compared to the traditional design scheme. The proposed numerical and analytical approaches allow estimating the highest pressure and energy characteristics values.
The article is devoted to studying the contra-rotating stages with different impellers and blade discs. Determining the reduction of volumetric losses by modeling the contra-rotating stages in the software package ANSYS CFX. The work aimed to create and study the flow and characteristics: semi-open, closed impellers, and blade discs. As a result of the work, the following contra-rotating stages were determined and compared: the semi-opened impeller with the semi-opened blade disc; the closed impeller with the closed blade disc; the semi-opened impeller with the closed blade disc; the closed impeller with the semi-opened blade disc. As a result of research, fluid flows in contra-rotating stages and their characteristics in the form of pressure and efficiency were obtained. According to the obtained data, the expediency of using contra-rotating stages as a working body of the pump is written.
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