Combined numerical simulation of exhaust hood and last stage’s whole annular cascades

A combined numerical simulation which couples the exhaust hood with the whole annular cascades has been carried out by CFD software CFX.Compare to single simulation of fluid flow in exhaust hood,combined simulation can take considerd of strong flow interactions between last stage and exhaust hood.The whole annular cascades used in this simulation can reduse the error of parameter transmition from one side of periodic interface to the other.Thus,combined numerical simulation can simulate more actual inlet conditons of the exhaust hood so as to obtain more accurate flow field in exhaust hood which has a strong impact on the evalution of exhaust hood's aerodynamic performance.