OPTIMIZATION OF AERODYNAMIC PERFORMANCE OF S-CO2 RADIAL INFLOW TURBINE FOR TOWER SOLAR POWER GENERATION SYSTEM
For the tower solar power generation system based on the supercritical CO2 Brayton cycle,the main thermal parameters of the radial inflow turbine are given by combining thermal design and aerodynamic design.The internal flow characteristics and loss,formation and development of leakage vortices,and the change law of turbine performance under different rotor blade wrapping angles are explored through numerical simulation.The results show that the internal loss of the rotor blade is mainly concentrated in the upper part of the axial basin of the rotor blade,and due to the existence of the leaf top gap,the leakage flow coming from the pressure plane of the driven blade suction is mixed with the main stream,forming a large leakage vortex at the turning angle of the meridian surface of the rotor blade and continuously sucking to form a spiral flow in the axial basin.By increasing the blade wrap angle,the development of eddy currents in the flow channel can be effectively suppressed,while reducing residual speed loss,but it will also increase in blade load,blade tip leakage strength,overall reaction and friction loss.After the optimization of the rotor blade wrapping angle,the turbine efficiency reaches a maximum of 82.18% at a wrapping angle of 45°,which is 0.84% higher than that before optimization.
solar energyBrayton cycleradial flow turbineaerodynamic analysiswrap angle
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