Closed circulation centrifugal compressor characteristic test method

Abstract

The invention discloses a closed circulation centrifugal compressor characteristic test method. The method comprises the following process that inert mixed gas is injected into a closed circulation loop, air supplied by an air source is adopted to push a centripetal turbine, and a compressor tester coaxial with the centripetal turbine is driven to rotate by the centripetal turbine; according to the set working condition, a rotating speed of the centripetal turbine is adjusted, so that an open circulation loop enters a rotating speed closed-loop control state; after inlet and outlet airflow parameters of the compressor tester are stable, inlet and outlet thermodynamic parameters thereof are measured; and by adjusting a rotating speed of the centripetal turbine in the open circulation loop,the compressor tester is synchronously adjusted to other to-be-detected rotation speeds, and measurement and recording work of all characteristic line data points are completed in sequence. Accordingto the method, matching change of the reduced flow rate and the reduced rotation speed of the compressor tester can be achieved, the variable working condition requirement of a performance test of a centrifugal compressor is met, and the adjustment control difficulty of the performance test of a centrifugal compressor part is greatly reduced.

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...

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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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