High Specific-Speed Kaplan Turbine-Cascade Whose Perfomance Scarcely Changes with Cavitation Number

Hitoshi Soyama, Tsutomu Narasaka, Risaburo Oba, Ryoichro Oshima, Johshiro Satoh, Seiichi Tanabe, Katsumasa Shimmei

Research output: Contribution to journalArticlepeer-review

Abstract

In order to find low-drag thin hydorfoils in cascades applicable to Kaplan turbines, we systematically investigate the subcavitating perfomance and the cavitation aspects around circular-shape hydrofoils for two cascade arrangements of various cavitation numbers and incidences. Our previous paper showed that the separation bubble near the leading edge, especially a long bubble, markedly increases the drag for thin hydrofoils in the cascade of present interest. Hence we investigate the behavior of the long bubble here. We try to suppress the long bubble, so that there is a marked increase in drag, by applying accelerating cascade effects of high-cambered hydrofoils effectively. We find a superior cascade hydorfoil, whose perfomance scarcely changes with cavitation number.

Original languageEnglish
Pages (from-to)1361-1366
Number of pages6
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume58
Issue number549
DOIs
Publication statusPublished - 1992 Jan 1
Externally publishedYes

Keywords

  • Blade
  • Cascade
  • Cavitation
  • Separation
  • Water Turbine

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'High Specific-Speed Kaplan Turbine-Cascade Whose Perfomance Scarcely Changes with Cavitation Number'. Together they form a unique fingerprint.

Cite this