Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1088/1742-6596/782/1/012004
Ключевые слова: CFD, Francis turbine, LES, numerical simulation, pressure pulsation, RANS and DES models, the precession of the vortex rope, turbulence, Computer simulation, Flow structure, Francis turbines, Hydraulic turbines, Numerical models, Shear stress, Turbulence models, Francis hydro-turbine, Linear approximations, Low-frequency pressure pulsations, Nonstationary process, Numerical investigations, Shear-stress transport, Vortex rope, Computational fluid dynamics
Аннотация: We performed numerical simulation of flow in a laboratory model of a Francis hydroturbine at startup regimes. Numerical technique for calculating of low frequency pressure pulsations in a water turbine is based on the use of DES (k-? Shear Stress Transport) turbulence model and the approach of "frozen rotor". The structure of the fПоказать полностьюlow behind the runner of turbine was analysed. Shows the effect of flow structure on the frequency and intensity of non-stationary processes in the flow path. Two version of the inlet boundary conditions were considered. The first one corresponded measured time dependence of the discharge. Comparison of the calculation results with the experimental data shows the considerable delay of the discharge in this calculation. Second version corresponded linear approximation of time dependence of the discharge. This calculation shows good agreement with experimental results.
Журнал: 2nd Francis-99 Workshop: Transient Operation of Francis Turbines (14 December 2016 through 15 December 2016
Выпуск журнала: Vol. 782, Is. 1