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1

Shape optimization of the screw machine work space

Svigler J.

Modelling and Optimization of Physical Systems

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2007

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z. 6

149--152

EN

The work space is the most important part of screw machines, which are created with screw compressors and screw engines. Especially the screw engine should be significant in utilizing of the waste head in engineering, chemistry industry and power plants. This paper solves optimization of the work space with regard to reach of extreme volume and pressure values compressed or expanded medium. The optimization itself does not change the basic structural machine parameters such as axis distance, rolling circles, number of teeth and helix angle.

DE

Im Beitrag wird die geometrische Optimierung des Arbeitsraumes der Schraubenmaschine aus der Sicht des Erreichens der extremen Werte des Volumens und Druckes des Arbeitsmediums gelöst. Die Definitionsbereiche der einzelnen Grössen werden so bestimmt, dass der theoretisch pünktliche Eingriff der zusammeneingreifenden Zahnprofile garantiert wird und dass es nicht zur Interferenz der Zahnprofile kommt. Die Optimierungsaufgabe ändert nicht die Grundkonstruktionsparameter der Maschine wie den Achsenabstand, Zahl der Zähne und Steigungswinkel der Schraubenlinie.

2

Relative movement of conjugated screw surfaces under bearing deformation

Slavikova K., Svigler J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2005

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z. 29

419-424

EN

Contribution deals with analysis of correct and incorrect contact of conjugated screw surfaces and relative movement of these surfaces. First part describes creation of conjugated surfaces a2 and o3 a and correct contact of surfaces. Mentioned theory is used to creation of parts of teeth of rotors with profile SLF4 in second part. Third part of contribution describes incorrect contact of conjugated surfaces and relative movement of surfaces in correct and incorrect contact.

3

Contribution to the mathematical modelling of the fluid flow in screw machines

Vimmr J., Svigler J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2002

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nr 18

421-426

EN

The mathematical modelling of compressible flow belongs to challenging problems of internal aerodynamics, examples of which can be found in many areas of industry, for instance in screw compressors. This paper is deyoted to the numerical computation of the 3D stationary inviscid transonic flow in internal aerodynamics. For the numerical solution of this system the cell-centred finite volume formulation of the explicit two-step MacCormack scheme with Jameson's artificial dissipation is used.

4

Preliminary analysis of the fluid flow in screw compressors

Svigler J., Vimmr J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2000

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z. 12

79-82

EN

In addition to kinematic and dynamic analyses of screw compressors it is necessary to turn our attention to the internal fluid dynamics of the screw compressors. This paper presents numerical computation of compressible inviscid flow in the work space of the screw compressor and through the gaps on its boundary. The mathematical model is described by the conservative system of euler equations. The numerical solution of this system is based on a finite difference and finite volume methods utilized on a structured quadrilateral mesh. The results are verified with the software package Fluent 5.0.2.