期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：240
期号：7
页码：1-12
DOI：10.1088/1755-1315/240/7/072011
出版社：IOP Publishing
摘要：Hydro-turbines are operated at loads above or below the best efficiency point (over- or part-load), where turbulent flow structures are formed in the draft tube. The goal of the project is to investigate complex turbulent structures present in the draft tube through a thorough numerical investigation. In the context of numerical simulations, a focus is made on the turbulence model and the numerical scheme. Transient simulations with the k-ω SST and SAS (Scale Adaptive Simulation)-SST turbulence models are applied with a novel eddy-preserving limiter scheme for draft tube flows. The application of both the SAS-SST turbulence model and the eddy-preserving limiter scheme allows for the resolution of more turbulent structures. The impact of the inlet modification is also studied. Numerical results are validated through a comparison to experimental data for the BulbT test case.
