Numerical study of combining steady Vortex Generator Jets and Deflected Trailing edge to reduce the blade numbers of low pressure turbine stage

Abstract

A flow control system that combined steady Vortex Generator Jets and Deflected Trailing-edge (VGJs-DT) to decrease the low pressure turbine (LPT) blade numbers was presented. The effects of VGJs-DT on energy loss and flow of low solidity low pressure turbine (LSLPT) cascades were studied. VGJs-DT was found to decrease the energy loss of LSLPT cascade and increase the flow turning angle. VGJs-DT decreased the solidity by 12.5% without a significant increase in energy loss. VGJs-DT was more effective than steady VGJs. VGJs-DT decreased the energy loss and increased the flow angle of the LSLPT cascade with steady VGJs. VGJs-DT can use 50% less mass flow than steady VGJs to inhibit the flow separation in the LSLPT cascade. The deflected trailing edge enhanced the ability of steady VGJs to resist flow separation. Overall, VGJs-DT can be used to control flow separation in LPT cascade and reduce the blade numbers of low pressure turbine stage.