The gap size effect on leakage flow and cavitation in the clearance of a 2D hydrofoil: High-speed visualization and velocity measurements

Konstantin S. Pervunin, Mikhail V. Timoshevskiy, Ivan I. Zapryagaev, Dmitriy M. Markovich, Georgy A. Semenov, Aleksandr V. Zakharov

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

In the study, tip-clearance cavitation inception and development was studied in the gap between an end face of a NACA0022-34 hydrofoil and a transparent sidewall of a test channel. The experiments were carried out for the attack angles of 3° and 9° and the gap width of 0.4 to 0.8 mm under various flow conditions on the cavitation number. In order to observe the tip-clearance cavitation inception and its dynamics, a high-speed visualization was applied. The leakage flow velocity was measured inside the clearance by a modified PTV technique. It was shown that unsteady dynamics of the primary cavity on the foil suction side affects the leakage flow direction and the gap cavitation evolution. An increase of the gap width causes the gap cavitation to be initiated at higher cavitation numbers.

Original languageEnglish
Article number062040
JournalIOP Conference Series: Earth and Environmental Science
Volume240
Issue number6
DOIs
Publication statusPublished - 28 Mar 2019
Event29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018 - Kyoto, Japan
Duration: 16 Sep 201821 Sep 2018

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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