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Abstract

Recently, significant progress has been made in experimental studies on the flow of wet steam, measuring techniques based on recording the phenomenon of extinction of light and ultrasound have been elaborated or improved. The basic value experimentally determined in the final stage was the content of the liquid phase defined as the wetness fraction. The methodology of tests and experimental investigations was presented, as well as the applied and developed measurement systems. Next, some developed designs of new ultrasonic and light extinction measuring probe and their modifications are described. The article presents also some examples of applications of the developed measurement techniques in application to experimental research conducted on wet steam. Examples of comparison between experimental and numerical tests for the extinction method are also provided.

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Authors and Affiliations

Mirosław Majkut
Sławomir Dykas
Krystian Smołka
Keywords Fan CFD Cyclorotor
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Bibliography

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Authors and Affiliations

Tomasz Staśko
1
Mirosław Majkut
1
Sławomir Dykas
1
Krystian Smołka
1

  1. Department of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
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Abstract

Besides centrifugal pumps, centrifugal fans are the most common turbomachines used in technical applications. They are commonly used in power engineering systems, such as heat engines and chillers, heating, ventilation, and air conditioning systems, supply and exhaust air systems. They are also used as machines consuming final energy (electricity). Therefore, any improvement in their efficiency affects the efficiency of energy generation and the level of electricity consumption. Many efforts have been made so far to find the most efficient numerical method of modelling flows in fans. However, only a few publications focus on the unsteadiness that may have an impact on device efficiency and noise generation. This paper presents an attempt to identify unsteadiness in the flow through a centrifugal fan by means of computational fluid dynamics and computational aeroacoustics methods. The works were performed using the Ansys CFX commercial software and the results of numerical studies are compared with experimental data.
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Authors and Affiliations

Balazs Pritz
1
Matthias Probst
1
Piotr Wiśniewski
2
Sławomir Dykas
2
Mirosław Majkut
2
Krystian Smołka
2

  1. Institute of Thermal Turbomachinery, Karlsruhe Institute of Technology, Kaiserstraße 12 D-76131 Karlsruhe, Germany
  2. Department of Power Engineering and Turbomachinery, Silesian University of Technology, Poland

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