Abstract
Supercritical carbon dioxide (S-CO2) Brayton cycle technology has the advantages of excellent energy density and heat transfer. The compressor is the most critical and complex component of the cycle. Especially, in order to make the system more reliable and economical, the design method of a high efficiency compressor without a high speed requirement is particularly important. In this paper, thermodynamic design software of a S-CO2 centrifugal compressor is developed. It is used to design the 150 kW grade S-CO2 compressor at the speed of 40,000 rpm. The performance of the initial design is carried out by a 3-D aerodynamic analysis. The aerodynamic optimization includes three aspects: numerical calculation, design software and the flow part geometry parameters. The aerodynamic performance and the off-design performance of the optimal design are obtained. The results show that the total static efficiency of the compressor is 79.54%. The total pressure ratio is up to 1.9. The performance is excellent, and it can operate normally within the mass flow rate range of 5.97 kg/s to 11.05 kg/s. This research provides an intelligent and efficient design method for S-CO2 centrifugal compressors with a low flow rate and low speed, but high pressure ratio.
Highlights
IntroductionEnvironment and development are three major themes we are facing today. The extensive use of fossil energy has posed a great threat to the living space of mankind
Energy, environment and development are three major themes we are facing today
The phenomenon was mainly caused by two factors
Summary
Environment and development are three major themes we are facing today. The extensive use of fossil energy has posed a great threat to the living space of mankind. CO2 is a low-cost fluid with a low critical point (31.1 ◦ C and 7.38 MPa). It is non-toxic and non-combustible and has great thermal stability, physical properties and safety [1]. The working temperature of the S-CO2 Brayton cycle is above the critical temperature of carbon dioxide. S-CO2 has good transitivity and fast mobility, and its density is close to that of liquid. It can make the pressure of the fluid high [2,3]. Compressor works near the critical point of carbon dioxide. The local condensation is easy to occur, so the design of compressor is very difficult
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