Uniform Conversions of Operating Points and Characteristics of Compressor

TL;DR

This paper develops a method for converting compressor operating points and characteristics using polytropic analysis, ensuring full similarity of flow and enabling comprehensive parameter transformation.

Contribution

It introduces a unified approach for converting all compressor parameters based on flow similarity, including thermodynamic and efficiency parameters.

Findings

All compressor parameters can be converted under flow similarity.

The method accounts for thermodynamic and efficiency parameters.

Complete conversion of compressor characteristics is achievable.

Abstract

In the paper, some aspects of the polytropic analysis are developed that concerned with various processes changing the thermodynamic state of flow of a real fluid and with reduction of these processes to processes having a given temperature and pressure of a given real mixture at the inlet. It is shown that all parameters of the process can be converted under condition of full similarity of flow that is formulated in the paper. An operating point of a compressor represents such process. It is to emphasize that parameters of the reduced point include not only volume flow, speed and polytropic head, for which a requirement of similarity of flow at inlet is sufficient, but also polytropic exponent, polytropic efficiency, outlet pressure and outlet temperature. This allows a conversion of all compressor characteristics. A method for that is described.