Đánh giá phân bố tổn thất qua các khối vùng của tổ máy thuận nghịch bơm -tuabin bằng mô phỏng số 3D

Abstract

This paper uses numerical simulation with ANSYS-Fluent software to analyze and estimate the loss distributions in the cell-zones of a reversible hydraulic machine that is called Pump as Turbine (PaT) in 2 modes: pump and turbine. The steady three-dimensional problem (3D) is considered on k-ε turbulence model. The cell-zones consists of spiral casing (h_cas), guide vanes (h_van), impeller (h_im), a draft tube (h_dr) and a space between zones (h_spa). Numerical results show that in the pump mode, the impeller zone accounts for 56.2%, followed by the vanes and draft tube with 18.56% and 12.87%. Leakage losses accounts for the lowest rate with 2.63%. In the turbine mode, the ratio of hydraulic losses of the impeller still accounts for the largest proportion of 59.13%, followed by the spiral casing zone with 11.69%. This is also the initial results and has significant in predicting the hydraulic characteristic curves and designing of this kind of machine in Vietnam