Tip Leakage Flow Structures and Its Influence on Cavitation Inception for a NACA0009 Hydrofoil

Author:

Feng Xianren1,Liu Yunqiao2,Wang Benlong2

Affiliation:

1. Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, China

2. Key Laboratory of Hydrodynamics (Ministry of Education), School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, China

Abstract

AbstractCavitation inception in tip leakage flows remains a challenging topic in the engineering field, as the effect of tip gap width on inception is unclear. The present study is devoted to an analysis of the effect of gap width on tip leakage cavitation inception by using full-wetted numerical simulations. Numerical results show that the cavitation inception number is strongly related to the dimensionless gap width τ, which is defined as the ratio of tip gap width to the maximum hydrofoil thickness, and the reason behind it is explained by the specific flow structures. The cavitation inception number of suction side (SS) sheet cavitation decreases gradually with the increase of dimensionless gap. The cavitation inception numbers of tip leakage vortex (TLV) and tip separation vortex (TSV) increase first and then decrease with the increase of the gap, reaching the maximum at τ=0.2 and τ=0.3, respectively. The main reason is that in the gap range of 0.2−0.3, TLV and TSV cores have the highest vorticity and the lowest pressure.

Publisher

ASME International

Subject

Mechanical Engineering

Reference25 articles.

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