Subcavitating Performance of Hydrofoils in Accelerating Cascade Designed for High-Specific-Speed Kaplan-Turbines (1st Report, Suitable Cascade Hydrofoils of 3 Percent in Thickness)

Tsutomu Narasaka, Risaburo Oba, Hitoshi Soyama, Johshiro Satoh, Yukihiko Wada, Seiichi Tanabe

Research output: Contribution to journalArticlepeer-review

Abstract

Complete reexamination of several existing studies on cavitation is absolutely necessary, as is suggessted by a recent study of Johnsson effects. In this paper, therefore, as the first step in this series, we try to find a good subcavitating performance hydrofoil in an accelerating cascade designed for high-specific-speed Kaplan-turbines, and also to check the several existing studies on cavitating cascade hydrofoils. This time, we take up a typical low-drag hydrofoil of 3 percent thickness, which has been successfully applied in the subcavitating range, and carefully investigate the subcavitating performance for two typical cascade arrangements, pitch chord ratio t/1 = 1.14, cascade angle θita;=23° and 35°, for various cavitation numbers σ and various cavitation aspects of the important controlling factor, showing a suitable thin cascade hydrofoil performance.

Original languageEnglish
Pages (from-to)3397-3402
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume55
Issue number519
DOIs
Publication statusPublished - 1989

Keywords

  • Bubble
  • Cascade
  • Cavitation
  • Cavitation Inception
  • Hydrofoil
  • Water Turbine

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

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