A test method for the characteristics of a closed cycle centrifugal compressor

Abstract

The invention discloses a method for testing the characteristics of a closed cycle centrifugal compressor. The process is as follows: inject an inert mixed gas into the closed cycle loop, drive a centripetal turbine through the air supplied by an air source, and drive the centripetal turbine coaxially with it. The compressor tester rotates; according to the set working conditions, adjust the speed of the centripetal turbine, so that the open loop enters the speed closed-loop control state; when the airflow parameters at the inlet and outlet of the compressor tester are stable, measure the thermodynamic parameters of the inlet and outlet; By adjusting the rotational speed of the centripetal turbine in the open circulation loop, the compressor tester is simultaneously adjusted to other rotational speeds to be tested, and the measurement and recording of all characteristic line data points are completed in sequence. The invention can realize the matching change of the equivalent flow rate and the equivalent rotational speed of the compressor tester, meet the requirement of variable working conditions in the performance test of the centrifugal compressor, and greatly reduce the adjustment and control difficulty of the performance test of the centrifugal compressor components.

Description

technical field [0001] The invention belongs to the technical field of compressors, and relates to a characteristic test method of a closed-cycle centrifugal compressor using an inert mixed gas as a working medium. Background technique [0002] Currently, including helium, supercritical CO 2 Many gases, such as working fluids, have been used in closed and semi-closed Brayton cycles as substitutes for air or gas. The similarity theory shows that for an ideal gas, the aerodynamic characteristics of the turbine are dimensionless functions of the reduced velocity parameter, the reduced flow parameter, the Reynolds number and the adiabatic exponent. Obviously, when the turbomachine uses alternative working fluid, the adiabatic index of the working fluid will change accordingly, and the traditional modeling criterion of the turbomachine will no longer be applicable, so the substitute working fluid cannot be obtained by modeling the experimental data of the turbine characteristics...

AI Technical Summary

Problems solved by technology

Obviously, when the turbomachine uses an alternative working fluid, the adiabatic index of the working fluid will change accordingly, and the traditional modeling criterion of the turbomachine will no longer be applicable, so the substitute working fluid cannot be obtained by modeling the experimental data of the turbine characteristics of the air working fluid Compressor Characteristics

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