Convective Cooling of Blades in a Turbine Driven by Supercritical Carbon Dioxide

Currently, active efforts are taken at power industry facilities to control the greenhouse gas, namely, carbon dioxide emissions. One of the solutions to reduce CO2 emissions at power industry facilities is to develop of oxygen-fuel energy complexes that feature almost zero greenhouse gas emissions. The most promising and effective oxygen-fuel energy complex is the one based on the Allam cycle. The article considers a study of the possibility and efficiency of using supercritical carbon dioxide as a coolant for a carbon dioxide turbine based on the Allam cycle. To do this, 1D calculation methods and numerical modeling techniques are used. Verification of the gas-dynamic computation against the experimental data is carried out. The heat transfer coefficients of supercritical CO2 are obtained under different flow conditions in the elements of the turbine flow paths. A 1D method for preliminary calculation of the coolant flow rate for a blade operating in a carbon dioxide turbine is formulated. The presented approach makes it possible to consider the thermophysical properties of supercritical carbon dioxide