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论文类型：期刊论文

发表时间：2015-11-02

发表刊物：JOURNAL OF HYDRAULIC RESEARCH

收录刊物：SCIE、EI、Scopus

卷号：53

期号：6

页面范围：787-796

ISSN号：0022-1686

关键字：Critical submergence; free surface vortex; particle image velocimetry (PIV); velocity distribution; vortex core radius; water surface profile

摘要：To study the characteristics of the vortex at a hydraulic intake, an experiment with a free surface vortex was conducted in a cylindrical tank. The vortex flow field was measured using particle image velocimetry (PIV) and extensive experimental data describing the vortex characteristics (radial and tangential velocity distributions, vortex core radius variation, water surface profile and circulation distribution) have been obtained and analysed. Based on the detailed experimental data, an empirical model describing the key vortex characteristics is developed. In addition, using the pressure distributions inside and outside the vortex core, a dimensionless equation for the critical submergence requiring only the Froude number and the circulation number is derived. Results using this equation are in agreement with the experimental data.