Optimization and CFD Analysis in Divergent Exhaust Diffuser Geometries for Maximum Coefficient of Pressure Recovery in Gas Turbine Engines

¹ Professor and Principal, School of Engineering and Technology, Jaipur National University, Jagatpura, Jaipur, Rajasthan - 302017
² Department of Management & Marketing, College of Business, Jazan University, Jazan, 45142, KSA
³ Associate Professor, Department of Mechanical Engineering, Vels Institute of Science, Technology & Advanced Studies, Chennai - 600117, Tamil Nadu, India
⁴ Assistat Professor, Dept. of Mechanical Engineering, R. L. Jalappa Institute of Technology, Affiliated to Visvesvaraya Technological University, Belagavi, Karnataka, India
⁵ Associate Professor, Department of Mathematics, School of Applied Sciences, REVA University, Bangalore - 560064, India
⁶ Assistant Professor, Department of Mechanical Engineering, SRM Institute of Science & Technology, Vadapalani Campus, Chennai, Tamil Nadu, India
⁷ Associate Professor, Department of Mechanical Engineering, Vels Institute of Science, Technology & Advanced Studies, Chennai 600117, Tamil Nadu
⁸ Researcher, Faculty of Business and Communications, INTI International University

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Published online: 10 March 2026

Abstract

This study aims to develop and evaluate models of a gas turbine engine's divergent exhaust diffuser to determine the configuration that maximizes the Coefficient of Pressure Recovery (CPR). Various diffuser geometries are explored, focusing on parameters such as half cone angle, intake diameter, outlet diameter, and diverging outlet diameter. Using the Ansys workbench, divergent exhaust diffusers are modeled with half cone angles of 7°, intake diameters ranging from 120 mm to 140 mm in 5 mm increments, and outlet diameters of 252.25 mm and 210.75 mm. Computational fluid dynamics (CFD) models are performed in ANSYS Fluent to analyze static pressure and exit velocity, from which the CPR is find for each configuration. Theoretical values from Bernoulli's and continuity equation checked with the CFD results. The geometry that produces the highest CPR will identified to optimize the performance of divergent exhaust diffuser, thereby enhancing the turbine's power and efficiency.