核动力 S-CO₂ 系统热力性及透平变工况特性研究

The efficient utilization of nuclear energy is one of the key approaches to carbon peaking and carbon neutrality due to its characteristic of clean and high energy density. Parametric analysis is carried out based on the S-CO₂ Brayton system. GA algorithm is employed to get optimal system efficiency and corresponding system parameters. One-dimensional design and three-dimensional simulation are presented based on the optimization results. The off-design performance is evaluated based on the three-dimensional simulation method. Results show that the system can obtain maximum thermal efficiency under the optimal parameters combination. The deviation of efficiency and power output for the turbine between one-dimensional design and three-dimensional are 0.85% and 2.98%, respectively. The turbine shows great off-design performance and can operate with high isentropic efficiency in a wide range of mass flow rates under high rotational speed.