Centrifugal compressor working capacity one-dimensional algorithm based on impeller inlet natural prewhirl

Abstract

The invention provides a centrifugal compressor working capacity one-dimensional algorithm based on impeller inlet natural prewhirl, which comprises the following steps: 1) considering the influence of inlet natural prewhirl in an actual centrifugal compressor on the impeller working capacity, and applying a method for processing impeller outlet airflow slippage by Stodola to an impeller inlet; 2)correcting a simplified cycle speed coefficient of an Euler equation in the original one-dimensional calculation method of the impeller working capacity, and providing a corrected cycle speed coefficient; (3) directly associating the corrected cycle speed coefficient with the impeller inlet and outlet diameter, the impeller inlet and outlet blade installation angle, the number of impeller blades,the impeller rotating speed and the compressor flow parameters, and deducing and providing a novel one-dimensional calculation method considering the centrifugal compressor impeller acting capacity during impeller inlet natural prewhirl. According to the novel calculation method, the accuracy and reliability of one-dimensional scheme design of the centrifugal compressor are remarkably improved; the workload of model-level test correction in the product development process is reduced, the degree of dependence of centrifugal compressor scheme design on design experience of research and development personnel is reduced, and the method has the advantages of being simple in mathematical formula, clear in physical significance, easy to apply in engineering design and the like.

Description

technical field [0001] The invention belongs to the field of one-dimensional aerodynamic design of centrifugal compressors, and in particular relates to a one-dimensional algorithm of working capacity of centrifugal compressors based on the natural pre-rotation of impeller inlets. Background technique [0002] When using the efficiency method to carry out the aerodynamic design of the centrifugal compressor, it is first necessary to carry out the scheme design and step-by-step detailed calculation according to the one-dimensional design method. The one-dimensional design method is widely used in the compressor industry at home and abroad. As the core basic link of the three-dimensional design, the quality of the one-dimensional design scheme will have a crucial impact on the design quality of the final three-dimensional product. Among them, the design and calculation of the working capacity of the impeller is a key link in the one-dimensional scheme design, and its accuracy ...

AI Technical Summary

Problems solved by technology

Therefore, if the import pre-rotation is not considered (C 1u = 0) with the traditional one-dimensional calculation method, the calculated work capacity of the impeller is often higher than its actual work capacity, which leads to the fact that the designed centrifugal compressor cannot achieve the required work in actual operation, and must be passed Model-level tests are iteratively corrected

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