Investigating the Effect of Casing Injection Parameters on Transonic Axial Compressor Performance

Document Type : Research Article


1 assistant professor, Arak uArak University of Technology*niversity of technology

2 Scientific degree, faculty, Sharif University of Technology, Tehran, Iran


This article surveys the impact of various air injection parameters on the performance of the "NASA Rotor 37" axial compressor using ANSYS CFX Software. In order to ensure the validity and reliability of the findings, the compressor's performance curve is compared with experimental results and a statistically significant agreement is observed. The present study investigates the impact of various parameters, including flow rate, diameter, angle, and injection location, on the compressor's performance curve and flow structure. The results indicate that the compressor's stall margin and stable range extension are at their maximum values at a specific scale of each of the aforementioned parameters. Any deviation from this scale, either by reducing or increasing the injection parameters, leads to a reduction in the above characteristics. Furthermore, injection location has the most significant effect on the compressor performance among the investigated injection parameters. Although the presence of injection leads to an increase in the total pressure ratio in all injection states compared to the state without injection, the adiabatic efficiency at similar mass flow rates exhibits no significant change. The results also indicate that flow injection in the most suitable state (2.6% injection intensity, 3 millimeters diameter, 30-degree angle, and 41.17% distance ratio) increases the stall margin amount by 27% and the stable range extension of the compressor by 192%.


Main Subjects