Cihat Emre ÜstünÏlhami ÜnalNurettin ÖzbeyNail Bugra KilicNursev ErdoğanÖzkan AltayMustafa TutarUnal, IlhamiErdogan, NursevKilic, Nail BugraAltay, OzkanUstun, Cihat EmreOzbey, NurettinTutar, Mustafa2025-10-06202510706631, 108976661070-66311089-766610.1063/5.02744072-s2.0-105012116481https://www.scopus.com/inward/record.uri?eid=2-s2.0-105012116481&doi=10.1063%2F5.0274407&partnerID=40&md5=95d80c290261b43e4fb1233e17ea9199https://gcris.yasar.edu.tr/handle/123456789/7990https://doi.org/10.1063/5.0274407A new engine intake electromagnetic wave blocker (EMWB) in a straight duct configuration is proposed as an alternative to S-shaped air intake ducts for reducing radar and infrared signatures of aircraft. A computational fluid dynamics model is developed and verified against an existing S-duct air intake study. Ten geometric parameters of the baseline EMWB are selected as design variables for a multi-objective optimization study. The design space is extensively explored with 68 configurations applying the constraints of pressure recovery (PR) > 0.97 and distortion coefficient (DC<inf>60</inf>) < 0.06. This process yields 16 feasible designs from which the best performing model in terms of PR and DC<inf>60</inf> is selected as the optimized EMWB. The electromagnetic model and experimental setup are then established. Radar cross-sectional measurements of the optimized EMWB model demonstrate significant improvements: aerodynamic performance is increased by 8.1% for PR and 14% for DC<inf>60</inf> while the radar cross section is decreased by 51%. These results suggest that the optimized EMWB in a straight duct configuration offers a promising alternative to S-shaped ducts for reducing aircraft engine signatures while maintaining aerodynamic performance. © 2025 Elsevier B.V. All rights reserved.Englishinfo:eu-repo/semantics/closedAccessAerodynamic Configurations, Air, Air Intakes, Aircraft Engines, Computational Fluid Dynamics, Ducts, Electromagnetic Simulation, Electromagnetic Waves, Engines, Fighter Aircraft, Radar Cross Section, Radar Measurement, Aero-dynamic Performance, Aerodynamic Design Optimization, Electromagnetics, Engine Intake, Intake Ducts, Multi Objective, Pressure Recovery, Radar Signature, S-shaped, Straight Duct, Circular WaveguidesAerodynamic configurations, Air, Air intakes, Aircraft engines, Computational fluid dynamics, Ducts, Electromagnetic simulation, Electromagnetic waves, Engines, Fighter aircraft, Radar cross section, Radar measurement, Aero-dynamic performance, Aerodynamic design optimization, Electromagnetics, Engine intake, Intake ducts, Multi objective, Pressure recovery, Radar signature, S-shaped, Straight duct, Circular waveguidesArticle