Transcritical Pattern of Cavutating Flow and Trends of Acoustic Level  

Oleh:

He, Yousheng ; Hu, Tianqun ; Gu, Wei

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Fluids Engineering vol. 123 no. 4 (2001), page 850-856.
Topik: ACOUSTICS; transcritical; pattern; cavutating flow; trends; acoustic level

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ89.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Hydroacoustics of the transcritical cavitating flows on a NACA16012 hydrofoil at a 2/5/8 - degree angle of attack and axisymmetric bodies with hemispherical and 45 - degree conical headforms were studied, and the process of cloud cavitation shedding was observed by means of high - speed cinegraphy. By expressing the cavitation noise with partial acoustic level, it is found that the development of cavitation noise varies correspondingly with cavitation patterns. The instability of cavitation is a result of cavity - flow interaction, and is mainly affected by the liquid flow rather than by the cavitation bubbles. A periodic flow structure with a large cavitation vortex is observed and found to be responsible for inducing the reentrant - jet and consequent cavitation shedding, and explains the mechanism of periodic cavitation shedding from a new viewpoint. New terms for the three stages, growing, hatching and breaking, are used to describe the process of cavity shedding.

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