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Corresponding Author

Mohamed Abdelaal Mohamed

Document Type

Original Study

Subject Areas

Mechanical Engineering

Keywords

Axial compressor; Rotor; Degree of reaction; Exergy destruction; First and second law efficiency; Pressure ratio

Abstract

This paper presents a comprehensive energy and exergy analysis of a multistage axial compressor, specifically examining a 12-stage model to assess the impact of varying inlet temperatures, degrees of reaction, and pressure ratios. This study contributes to the ongoing efforts to optimize compressor technology for better performance and reduced energy consumption, emphasizing the importance of parameter selection in achieving desired operational outcomes. In the current research, the performance of the axial compressor was studied from an energy and exergy point of view while changing the parameters previously mentioned in detail as stages and rotors due to the lack of previous research. Utilizing the engineering equation solver (EES), detailed simulations were conducted to uncover the thermodynamic behaviors across different compressor stages. The findings indicate that increases in the degree of reaction lead to higher exergy destruction yet improve the efficiencies according to the first and second laws. Similarly, elevated pressure ratios were found to enhance stage-specific work consumption and second-law efficiency, providing valuable insights into the operational dynamics of axial compressors. These results offer significant implications for the design and optimization of axial compressors, proposing that careful adjustments of the degree of reaction and pressure ratios can lead to more energy-efficient compressor configurations. A stage pressure ratio from 1.22 to 1.36 for the number of stage 12 leads to an increase in specific work consumption and about a 2% improvement in second-law efficiency. Increasing the degree of reaction from 0.5 to 0.7 results in nearly a 1% rise in the exergy destruction ratio for one rotor of the stage. This adjustment underscores the pivotal role of the degree of reaction in optimizing compressor efficiency.

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