文章摘要:Abstract:We investigate the cavitation incipience and development of water flow over a thin hydrofoilplaced in the test section of high一speed cavitation tunnel. Hydrofoils with smooth and rough leadingedge were tested for different upstream velocities and incidence angles. Our observations clearly re-vealed that cavitation incipience is enhanced by roughness at incidence angle below 20. This is in linewith the former reports，according to which roughness element decreases the wettability and traps a lar-ger amount of gas. As a result，surface nucleation is enhanced with an increased risk of cavitation.Surprisingly, for higher incidence angles（>30），we have found that cavitation incipience is signifi-candy delayed by roughness while developed cavitation is almost the same for both smooth and roughhydrofoils. We argue that this unexpected incipience delay is related to the change in the boundary la-yer structure due to roughness. We also report a significant influence of roughness on the dynamic ofdeveloped cavitation and shedding of transient cavities.

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论文分类号:S277.9