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.
|Number of pages||7|
|Journal||IOP Conference Series: Earth and Environmental Science|
|Publication status||Published - 28 Mar 2019|
|Event||29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018 - Kyoto, Japan|
Duration: 16 Sep 2018 → 21 Sep 2018