Ing. Roman Klas, Ph.D.
E-mail:   klas@fme.vutbr.cz  Dept.:   Energy Institute Victor Kaplan Dept. of Fluid Engineering Position:   Assistant Professor

Publications:

• KLAS, R.; POCHYLÝ, F.:
  The Modification of Spiral Case and Impeller of Mixed Flow Pump,
  Engineering Mechanics, Vol.20, (2013), No.2, pp.129-138, ISSN 1802-1484, Association for Engineering Mechanics
  journal article - other
• ŠTIGLER, J.; ŠPERKA, O.; KLAS, R.:
  A fluid flow in the pipe junction with 6,25 corss-section area ratio. The influence of the adjacent branch angle on the pipe junction charcteristics.,
  IOP Conference Series-Earth and Environmental Science, pp.1-8, (2012)
  conference paper
  akce: 26th IAHR Symposium on Hydraulic Machinery and Systems, Beijing, 19.08.2012-23.08.2012
• ŠTIGLER, J.; KLAS, R.; KOTEK, M.; KOPECKÝ, V.:
  The Fluid Flow in the T-Junction. The Comparison of the Numerical Modelling and PIV Measurement.,
  Těorija i praktika nacoco - i kompressorostrojenija, pp.240-247, ISBN 978-966-657-384-4, (2011)
  book chapter
• ŠTIGLER, J.; KLAS, R.; KOTEK, M.; KOPECKÝ, V.:
  The Fluid Flow in the T-Junction the Comparison of the Numerical Modelling and PIV Measurement,
  Procedia Engineering, Vol.39, (2011), No.1, pp.19-27, ISSN 1877-7058, Elsevier
  journal article - other
• POCHYLÝ, F.; HALUZA, M.; KLAS, R.:
  The stability of Y(Q) characteristic curve,
  IOP Conference Series-Earth and Environmental Science, pp.685-690, (2010), IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK
  conference paper
  akce: 25th IAHR Symposium on Hydraulic Machinery and Systems, Timisoara, 20.09.2010-24.09.2010

List of publications at Portal BUT

Abstracts of most important papers:

• KLAS, R.; POCHYLÝ, F.:
  The Modification of Spiral Case and Impeller of Mixed Flow Pump,
  Engineering Mechanics, Vol.20, (2013), No.2, pp.129-138, ISSN 1802-1484, Association for Engineering Mechanics
  journal article - other
  This paper is aimed at differences in designs of spiral case and impeller of mixed flow pump with regard to suppression of Y – Q characteristic curves instability, pressure pulsations and especially to achieving necessary delivery head. The differences between new and old conception will be explained. The reasons of these differences with regard to flow in pump interior, hydraulic losses, static pressures and velocities will be explained as well.
• ŠTIGLER, J.; ŠPERKA, O.; KLAS, R.:
  A fluid flow in the pipe junction with 6,25 corss-section area ratio. The influence of the adjacent branch angle on the pipe junction charcteristics.,
  IOP Conference Series-Earth and Environmental Science, pp.1-8, (2012)
  conference paper
  akce: 26th IAHR Symposium on Hydraulic Machinery and Systems, Beijing, 19.08.2012-23.08.2012
  This article deals with a fluid flow in the pipe junction. The comparison of the pipe junction characteristic obtained from the experiment with the pipe junction characteristic obtained from the numerical modelling using the CFD software wil be discused in this article. All measruements are done for the case of 50mm diameter of the straight pipe and 20 mm diameter of the adjacent branch with five different angles. There are six possible flow configurations for this pipe junction. Three of them are cases of the flow combination and three of them are case of the flow division. Only results for the flow combinaton are presented in this paper.
• ŠTIGLER, J.; KLAS, R.; KOTEK, M.; KOPECKÝ, V.:
  The Fluid Flow in the T-Junction. The Comparison of the Numerical Modelling and PIV Measurement.,
  Těorija i praktika nacoco - i kompressorostrojenija, pp.240-247, ISBN 978-966-657-384-4, (2011)
  book chapter
  There is presented the fluid flow in the T-junction with the 90 degree angle of the adjacent branch and with the 50mm diameter of each branch, in this chapter. The flow is organized as a combining flow. It means that there are two inlet branches and only one outlet branch. There are two possible kinds of the flow combinations for this T-junction. The CFD calculations and the PIV measurements were done for both flow combinations. Its comparison is presented in this paper.
• ŠTIGLER, J.; KLAS, R.; KOTEK, M.; KOPECKÝ, V.:
  The Fluid Flow in the T-Junction the Comparison of the Numerical Modelling and PIV Measurement,
  Procedia Engineering, Vol.39, (2011), No.1, pp.19-27, ISSN 1877-7058, Elsevier
  journal article - other
  There is presented the fluid flow in the T-junction with the 90 degree angle of the adjacent branch and with the 50mm diameter of each branch, in this chapter. The flow is organized as a combining flow. It means that there are two inlet branches and only one outlet branch. There are two possible kinds of the flow combinations for this T-junction. The CFD calculations and the PIV measurements were done for both flow combinations. Its comparison is presented in this paper.
• POCHYLÝ, F.; HALUZA, M.; KLAS, R.:
  The stability of Y(Q) characteristic curve,
  IOP Conference Series-Earth and Environmental Science, pp.685-690, (2010), IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK
  conference paper
  akce: 25th IAHR Symposium on Hydraulic Machinery and Systems, Timisoara, 20.09.2010-24.09.2010
  The contribution is aimed on the analysis of Y(Q) characteristic of centrifugal pump. The main attention is concentrated on the impeller of high specific speed, especially on the diagonal pumps. It is derived, that stability of Y(Q) curve depends on the dissipative function. The analysis concludes that very important is the design of the interior of spiral case and distributor to achieve a stable Y(Q) characteristic curve.