DEVELOPMENT OF NEW HIGH LOAD/HIGH LIFT TRANSONIC SHROUDED HP GAS TURBINE STAGE DESIGN - A NEW APPROACH FOR TURBOMACHINERY

摘要

This paper details some of the recent developments that ALSTOM has made, in collaboration with QinetiQ, to develop and test highly loaded high pressure turbine stage designs. A new approach was used for the preliminary design of the stage (adapted from the Denton U~3 method) and this is described. For the first time the standard empirical loss correlations were abandoned. The targets for the stage are very aggressive. The stage incorporates many innovative features to address aerodynamic and other parasitic losses, including "Controlled Flow" technology to address secondary flow losses. This new approach is then validated against detailed steady performance measurements. Additional unsteady traverse measurements taken have been used to validate the predicted rotor flow field. These unsteady traverse measurements have also been used to resolve the unsteady flow field. Although detailed interpretation of these results has not yet been completed, some understanding is drawn from these results.