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：8
页码：1-9
DOI：10.1088/1755-1315/240/8/082003
出版社：IOP Publishing
摘要：During the load rejection process, the nonlinear pulsation characteristic and its influence are significant. However, in most previous simulations, the effects of nonlinear pulsation are not fully considered. In this study, the load rejection process was simulated respectively with two different methods. In the average simulation method, the boundary conditions at the inlet and outlet of the pump-turbine were determined with the average filtered unsteady experimental data. The turbulence flow was simulated through Reynolds-averaged Navier-Stokes (RANS) with the renormalization group (RNG) k-ε model. While, in the pulsating simulation method, the boundary conditions at the inlet and outlet of the pump-turbine were directly determined with the original unsteady experimental data. The turbulence flow was simulated using the large eddy simulation (LES) method. Then, the numerical results obtained from the two methods were compared with the experimental data. Results show that the performances of the pulsating simulation method are generally better than those of the average method. However, large computer resources have to be consumed using the pulsating simulation method. Therefore, the two simulation methods should be selected correctly and flexibly according to the actual requirements in the simulation of the load rejection process.
