Component Sizing and Design-Point Performance Evaluation of a Two-Spool Turbofan Engine with Mixed Exhaust and Afterburner
Abstract: This paper presents a simplified design-point sizing methodology for a two-spool turbofan engine with mixed exhaust, including an afterburning configuration. The high-pressure (HP) turbine drives the HP compressor, and the low-pressure (LP) turbine drives the fan. Three configurations are analyzed: (i) mixed-exhaust turbofan with afterburner and fuel injection, (ii) mixed-exhaust turbofan with afterburner but without fuel injection, and (iii) mixed-exhaust turbofan without afterburner. Using specified cruise Mach number and altitude, design thrust, turbine inlet temperature, component pressure ratios/efficiencies, spool speeds, and combustor/afterburner pressure losses, a component-matching procedure is implemented in C to compute stagnation states, mass flow rate, and required flow areas for each component. Compressor and turbine characteristic maps from the Gas Turbine Simulation Program (GSP-10) are used as reference maps; size ratios are obtained by equating non-dimensional mass flow so that the maps can be applied to the new design. The predicted thrust and thrust specific fuel consumption (TSFC) agree with GSP-10 within approximately 4% and 12%, respectively, for the tested design point. For the studied case, afterburning increases thrust by about 105% at the expense of roughly 309% increase in fuel flow, supporting the practical use of afterburning only for short duration thrust augmentation.
Keywords: Turbofan engine; component sizing; design-point performance; component matching; afterburner; GSP-10 validation
How to Cite?: Anshul A. Jain, "Component Sizing and Design-Point Performance Evaluation of a Two-Spool Turbofan Engine with Mixed Exhaust and Afterburner", Volume 14 Issue 12, December 2025, International Journal of Science and Research (IJSR), Pages: 1945-1948, https://www.ijsr.net/getabstract.php?paperid=SR251223120745, DOI: https://dx.doi.org/10.21275/SR251223120745