Comparative Study of Variable and Static Inlet Guide Vane Effects on CF6-80C2 Engine Performance across Flight Stages

Ajayi Joel Adewale, Makinde Samuel Kayode, Bello Yekini, Adeogo Daniel Oluwatobiloba, Kazeem Lamid, Omiogbemi Ibrahim Momoh-Bello

Abstract


This study uses GasTurb 15 simulation software to compare the performance of the CF6-80C2 turbofan engine with variable and static inlet guide vanes (IGVs) during the take-off, climb, cruise, and descent flight stages. In comparison to a fixed-angle static IGV configuration, the study examines the effects of variable IGV angles (0°, 10°, 20°, and 30°) on important performance metrics, such as thrust, specific fuel consumption, and compressor efficiency. Using a controlled simulation-based approach, the methodology validated outputs against real-world specifications and configured the engine model using manufacturer data. According to the results, variable IGVs improve flexibility. The ideal angles vary depending on the stage of the flight; lower angles (0°–10°) support efficiency during cruising, while higher angles (20°–30°) improve thrust during take-off and climb. However, while static IGVs provide stability during design, they are not flexible during off-design stages. The results demonstrate how variable geometry can be used to maximize engine performance, which is supported by aerodynamic principles. While the study advances aerospace engineering by expanding knowledge on IGV effects in high-bypass turbofans and validating GasTurb 15 as a simulation tool, recommendations include experimental validation and real-time IGV control systems. This research provides a foundation for future design enhancements and operational strategies in turbofan engines.


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References


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