A similar modeling method for supercritical carbon dioxide compressor test

Abstract

The invention discloses a similar modeling method for a supercritical carbon dioxide compressor test. Firstly, according to the geometric similarity criterion, the geometric parameters of the test model are obtained through scaling up. Then, according to the flow similarity criterion between different working fluids, the number of main criteria is consistent, and the operating parameters such as the speed, inlet pressure, inlet temperature, and flow rate of the air working fluid compressor are obtained, and experimental research is carried out to obtain experimental data. Secondly, the performance parameters such as pressure ratio, isentropic efficiency, stress load and leakage flow of supercritical carbon dioxide compressor are deduced according to the performance conversion criterion. Finally, change the operating conditions, evaluate the comprehensive performance of the supercritical carbon dioxide compressor under different operating conditions, and verify the variable operating condition performance of the supercritical carbon dioxide compressor. By adopting the modeling method of the present invention, the complexity of the supercritical carbon dioxide compressor test system and the difficulty in building a test bench can be significantly reduced, the test cost can be saved, and the product development cycle of the supercritical carbon dioxide compressor can be shortened.

Description

technical field [0001] The invention belongs to the field of impeller machinery, and in particular relates to a similar modeling method for a supercritical carbon dioxide compressor test. Background technique [0002] Using supercritical carbon dioxide as the power cycle working fluid can make full use of its advantages of high density, low viscosity and low surface tension, significantly reduce the size of the power cycle system, and improve cycle efficiency. supercritical carbon dioxide (SCO) 2 ) The application of the Brayton cycle in the new generation of nuclear power, coal power, waste heat utilization, and renewable energy utilization has attracted more and more attention. As one of the core components of the power cycle, the compressor functions to compress the low-pressure supercritical carbon dioxide working fluid to the high-pressure state required for heating by the heat source. The power consumption and efficiency of the compressor have a major impact on the ef...

AI Technical Summary

Problems solved by technology

However, for supercritical carbon dioxide working fluid, its physical parameters are significantly different from air. How to organize the modeling test of supercritical carbon dioxide compressor using air working fluid is a realistic and complicated problem. In the current public information, there is no systematic A similar modeling method that directly guides the experimental design of supercritical carbon dioxide compressors

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