Research on the flat and variable working condition characteristics of high-power multi-stage and multi-stage axial flow turbines with compressed air energy storage
ZHANG Ge
LIU Tong
MOU Haitao
WANG Cuiping
ZHAO Zhiqing
WU Jiahua
LI Boyu
WANG Xu
Abstract：A multi-stage axial flow turbine is designed for the energy release process of a 350 MW-class compressed air energy storage system.Its core structure consists of three coaxial series turbines.The efficient conversion of the internal energy of the working medium into mechanical energy is achieved through segmented heating and multi-stage expansion.The total expansion ratios of each turbine section are 0.20,0.22 and 0.24.The third section adopts a symmetrical diversion design to reduce the axial thrust.The results show that at the rated speed of 3 000 r/min,the turbine flow rate and the isentropic efficiency show a significant nonlinear relationship with the expansion ratio.When the expansion ratio is low,the flow rate is stable between 650 kg/s and 680 kg/s,and the efficiency is between 0.92 and 0.95.When the expansion ratio is high,the efficiency decreases as the expansion ratio increases.When operating at variable speeds,the turbine's flow rate and efficiency significantly increase within the range of 2 000 r/min to 3 000 r/min.
Keywords：compressed air energy storageaxial flow turbineisentropic efficiencyperformance under variable operating conditions
Publication Date：2025-11-30
Online Publishing Date：2025-12-29(First online date of this platform, not the publication date of the document)
Pages：5( 69-73 )