Publication detail

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

STAREČEK, J. ČUPR, P. HALUZA, M.

Original Title

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

Type

conference paper

Language

English

Original Abstract

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.

Keywords

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

Authors

STAREČEK, J.; ČUPR, P.; HALUZA, M.

Released

28. 6. 2019

Publisher

EDP Sciences

ISBN

2100-014X

Periodical

EPJ Web of Conferences

Year of study

213

Number

1

State

French Republic

Pages from

1

Pages to

7

Pages count

7

URL

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

Full text in the Digital Library

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"
}