Development of an unsteady multi-species numerical method for internal compressible flows in the turbine

Abstract

Flexible Fuel is used for land-based power generation gas turbine to meet the environmental requirements, which brings high temperature gases with variable composition to the turbine downstream. In this paper, a high-order and high-resolution in-house CFD code (named START) was developed to capture more features of the real multi-species flow in the turbine. The code was validated with four samples, ranging from subsonic to transonic and supersonic flows. The validation showed that the code had high accuracy and fidelity to simulate the flows, which included both shock wave and species diffusion. Then the solver was used to simulate the unsteady multi-species flow in a 1.5-stage turbine, which included CO2 coolant injection at the 1st stator trailing edge. The cooling effect on the rotor downstream and associated losses were studied in terms of the coolant- to-free stream velocity ratio. Copyright © 2013 Gas Turbine Society of Japan.