Detail publikace

Design of a high-specific speed turbine with non-uniform blade cascade

STAREČEK, J. ČUPR, P. HALUZA, M.

Originální název

Design of a high-specific speed turbine with non-uniform blade cascade

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

This paper presents the hydraulic design of Kaplan type turbine in fully axial configuration. The turbine model consists of a straight pipe intake, a rib which covers the shaft, five axial guide vanes, a six blade runner and a 10,6°-full angle draft tube. Due to the presence of non-uniform velocity field behind the rib and interaction between stator and rotor, the pressure pulsations occur and cause some excitation forces acting on the runner. To reduce these negative phenomena the six non-uniform blade runner has been designed using computational fluid dynamics modelling (CFD). The runner blades are placed in various axial distances from the guide vanes. This new design should reduce the pressure pulsations caused by interaction between the rib and the runner, which is the main negative effect by the current design. The forces and torque which are acting on the runner blades as well as the pressure inside the turbine are observed in time domain. The amplitudes and frequencies are analysed using Fast Fourier Transform (FFT). The frequencies are compared to the modal analysis results of the runner submerged in water. This hydraulic design is based on previous axial turbine, which was designed for small hydro power plant located at Lužnice River. The design point is defined by head H = 1,5 m, volumetric flow rate Q = 2,1 m3/s and RPM n = 260 min-1. This turbine was designed using six runner blades to reduce the pressure, force and torque pulsations caused mainly by wakes, which were observed behind the rib.

Klíčová slova

Turbine, hydraulic design, high-specific speed, non-uniform, blade cascade

Autoři

STAREČEK, J.; ČUPR, P.; HALUZA, M.

Vydáno

28. 6. 2019

Nakladatel

EDP Sciences

ISSN

2100-014X

Periodikum

EPJ Web of Conferences

Ročník

213

Číslo

1

Stát

Francouzská republika

Strany od

1

Strany do

7

Strany počet

7

URL

https://www.epj-conferences.org/articles/epjconf/abs/2019/18/epjconf_efm18_02078/epjconf_efm18_02078.html

Plný text v Digitální knihovně

http://hdl.handle.net/11012/193669

BibTex

@inproceedings{BUT151855,
  author="Jakub {Stareček} and Pavel {Čupr} and Miloslav {Haluza}",
  title="Design of a high-specific speed turbine with non-uniform blade cascade",
  booktitle="EPJ Web of Conferences",
  year="2019",
  journal="EPJ Web of Conferences",
  volume="213",
  number="1",
  pages="1--7",
  publisher="EDP Sciences",
  doi="10.1051/epjconf/201921302078",
  issn="2100-014X",
  url="https://www.epj-conferences.org/articles/epjconf/abs/2019/18/epjconf_efm18_02078/epjconf_efm18_02078.html"
}