A Model Stage Performance Calculation Method for Low Pressure Ratio Axial Flow Compressor

Abstract

The invention provides a low-pressure-ratio axial compressor model level performance calculation method. The method is carried out according to the following steps of 1, collecting parameters: collecting environment parameters, flow parameters, inlet parameters, outlet parameters and early-stage preparation parameters of an axial compressor model level; 2, calculating overall performance parameters of the three-stage axial compressor model level: an overall energy head and overall variable efficiency; 3, obtaining a proportion coefficient of each stage of energy head and a proportion coefficient of variable efficiency; and 4, performing hierarchical calculation on the level performance parameters of each stage: according to the proportion coefficient of each stage of variable efficiency and the proportion coefficient of each stage of energy head, performing hierarchical decomposition on the overall performance parameters of the three-stage axial compressor model level obtained in the step 2. Through a multi-stage overall test, the decomposition calculation of each stage and the numerical simulation are combined to obtain relatively accurate axial compressor model level single-stageperformance parameters capable of guiding industrial application.

Description

technical field [0001] The invention belongs to the field of axial flow compressors, and relates to a low pressure ratio axial flow compressor model stage, in particular to a low pressure ratio axial flow compressor model stage performance calculation method. Background technique [0002] Axial flow compressors are widely used in metallurgy, petrochemical and other industrial fields. With the requirement of large-scale unit, high pressure and high efficiency, the requirements for technical indicators such as energy consumption, reliability and matching level of the unit are also getting higher and higher. In the development of new high-efficiency axial flow compressor units, testing is an insurmountable important link. However, the model-level tests of axial flow compressors, especially those with single-stage pressure rise and small temperature rise, are technically difficult due to large flow and small temperature rise, and the test accuracy is difficult to meet the appli...

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Problems solved by technology

Since the comb-shaped probe is difficult to make smaller, the insertion of the probe into the flow channel will also disturb the internal flow field at the model level

[0008] Regardless of whether it is a single-stage test or a multi-stage test, in order to obtain the performance of a single stage (or each stage) of the axial flow compressor model stage, relevant measuring points are arranged at the inlet and outlet of the stage, and the single-stage pressure rise of the axial flow cannot be avoided. The problem of large test error caused by small temperature rise

For example, when the single-stage temperature rise of the axial flow compressor is 5-15°C, the overall error of the conventional temperature measurement transmitter is 0.5°C. At this time, the error of temperature measurement itself is relatively large. If, according to this temperature rise is According to the calculation of the power or efficiency of the axial flow compressor, the maximum error may reach 8-10%

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