Uçak Hava Alığı için Dairesel ve Dikdörtgen S-Kanallarının Aerodinamik Performans Karşılaştırması: Bir CFD Çalışması

Yıl 2025, Cilt: 6 Sayı: 1, 13 - 33, 30.06.2025

Mehmet Turan Ekinci , Mahmut Sami Büker

https://doi.org/10.55212/ijaa.1636652

Öz

S-kanallar, aerodinamik ve uçuş performansını optimize etmek, verimliliği artırmak ve hem havacılık hem de otomotiv uygulamalarında düzgün hava akışı sağlamak için tasarlanmış önemli motor giriş kanallarıdır. Bu kanallar, hava akışını motora yönlendirmek ve iletmek, motor performansını iyileştirmek, yakıt verimliliğini artırmak ve türbülans gibi etkileri en aza indirmek için kullanılır. Askeri jetlerde, S-kanallar manevra kabiliyetini artıran ve gelen radar dalgalarını emebilen yapılardır. Ek olarak, S-kanallar hava akışını yumuşatarak gürültüyü azaltma da önemli bir rol oynar. S-kanallarda bazen ikincil akışlar ve akış ayrımı meydana gelebilir. İkincil akışlar ve akış ayrımı, S-kanallardaki performans üzerinde olumsuz bir etkiye sahip olabilir ve bu da uçuş performansında düşüşe yol açabilir.
Bu çalışmada, farklı geometriye sahip kanal içindeki hız, basınç, akış dağılımı ve kinetik enerji değişimlerini gözlemlemek için SOLIDWORKS kullanılarak dairesel ve dikdörtgen S-kanallar için 3B modeller oluşturuldu. Akış analizi, SST k-ω türbülans modeli uygulanarak ANSYS Fluent programıyla gerçekleştirildi. Analizlerde basınç, hız ve kinetik enerji için sonuçlar elde edildi. Bulgular, dikdörtgen S-kanalda basınç ve hız dağılımı daha düzgün olmasına rağmen, dairesel S-kanalının basınç geri kazanımı ve bozulma katsayısı açısından dikdörtgen S-kanaldan daha iyi sonuçlar verdiğini göstermiştir.

Anahtar Kelimeler

Aerodinamik performans; , Hesaplamalı akışkanlar dinamiği; , S-kanal; , Verimlilik

Aerodynamic performance comparison of circular and rectangular S-ducts for aircraft intakes: A CFD study

Öz

S-ducts are critical engine inlet components designed to optimize aerodynamics and flight performance, enhance efficiency, and ensure smooth airflow in both aerospace and automotive applications. These ducts are used to direct and deliver airflow to the engine, improving engine performance, increasing fuel efficiency, and minimizing effects such as turbulence. In military jets, S-ducts also serve as structures that enhance maneuverability and absorb incoming radar waves. Additionally, by smoothing the airflow, S-ducts play a significant role in noise reduction. However, secondary flows and flow separation can sometimes occur within S-ducts. These phenomena may negatively impact the performance of S-ducts, leading to a reduction in overall flight performance.
In this study, 3D models of circular and rectangular S-ducts were created using SOLIDWORKS to observe variations in velocity, pressure, flow distribution, and kinetic energy within ducts of different geometries. Flow analysis was carried out using the SST k-ω turbulence model in ANSYS Fluent. The analysis produced results for pressure, velocity, and kinetic energy. The findings indicated that although the pressure and velocity distributions were more uniform in the rectangular S-duct, the circular S-duct showed better performance in terms of pressure recovery and distortion coefficient.

Anahtar Kelimeler

Aerodynamic performance , Computational fluid dynamics , Efficiency , S-ducts

Kaynakça

• Aref, P., Ghoreyshi, M., Jirasek, A. and Satchell, M. J. 2018. CFD validation and flow control of RAE-M2129 S-Duct diffuser using CREATETM-AV kestrel simulation tools. Aerospace, 5(1), 31.
• Meneghin, A. 2020. “Three-objective optimization studies of an S-duct”. M.Sc. thesis, Universita degli Studi di Padova, Dipartimento di Ingegneria Industriale, Padova, Italy, 1-122.
• Thenambika, V., Ponsankar, S., and Prabhu, M. K. 2016. Design and flow analysis of S duct diffuser with submerged vortex Generators. International Journal of Engineering Research and Applications, 6(2), 79-84.
• Immonen, E. 2018. Shape optimization of annular S-ducts by CFD and high-order polynomial response surfaces. Engineering Computations, 35(2), 932-954.
• Rk, A. 2021. CFD Investigation on the Circular Rectangular and Ellipse shape on the Aerodynamics in S-Duct. International Research Journal of Engineering and Technology (IRJET), 08(04), 2051-2059.
• Lee, J., and Cho, J. 2018. Effect of aspect ratio of elliptical inlet shape on performance of subsonic diffusing S-duct. Journal of Mechanical Science and Technology, 32, 1153-1160.
• Jiang, F., Kontis, K., and White, C. 2024. Numerical investigation and mode analysis of the S-duct. Physics of Fluids, 36(11), 115150.
• Papadopoulos, F., Valakos, I., and Nikolos, I. K. 2012. Design of an S‐duct intake for UAV applications. Aircraft Engineering and Aerospace Technology, 84(6), 439-456.
• Saha, K., Singh, S. N., Seshadri, V., and Mukhopadhyay, S. 2007. Computational analysis on flow through transition S-diffusers: Effect of inlet shape. Journal of aircraft, 44(1), 187-193.
• Migliorini, M., Zachos, P. K., MacManus, D. G., and Haladuda, P. 2023. S-duct flow distortion with non-uniform inlet conditions. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 237(2), 357-373.
• Xiao, Q., Tsai, H. M., and Liu, F. 2003. Computation of Transonic Diffuser Flows by a Lagged k-? Turbulence Model. Journal of propulsion and power, 19(3), 473-483.
• Zhang, J. M., Wang, C. F., and Lum, K. Y. 2008. Multidisciplinary design of S-shaped intake. 26th AIAA Applied Aerodynamics Conference, 18-21 August, Honolulu, Hawaii.
• McLelland, G., MacManus, D. G., Zachos, P. K., Gil-Prieto, D., and Migliorini, M. 2020. Influence of upstream total pressure profiles on S-duct intake flow distortion. Journal of Propulsion and Power, 36(3), 346-356.
• [14] Novia, P., Asngali, B., Susanto, A., Adzandy, R., and Purnomo, H. 2023. COMPUTATIONAL FLUID DYNAMIC (CFD) SIMULATION ON REDESIGN BAFFLES OF YOGYAKARTA INTERNATIONAL AIRPORT TRAIN FUEL TANK. Media Mesin: Majalah Teknik Mesin, 24(1), 1-24.
• Aslan, S. 2017. “Experimental and Numerical Investigation of an S-Duct Diffuser Designed for a Micro Turbojet Engine Powered Aircraft ”. M.Sc. thesis, Middle East Technical University, Graduate School of Natural and Applied Sciences, Ankara, Turkey.
• Nguyen, S. 2013. “Computational fluid dynamics simulations of a diffusing S-duct using overset grids”. Ph.D. thesis, California State University, Los Angeles, USA.
• Chiang, C., Koo, D., and Zingg, D. W. 2022. Aerodynamic shape optimization of an S-duct intake for a boundary-layer ingesting engine. Journal of Aircraft, 59(3), 725-741.
• Wang, C., Lu, H., Kong, X., Wang, S., Ren, D., and Huang, T. 2023. Effects of Pulsed Jet Intensities on the Performance of the S-Duct. Aerospace, 10(2), 184.
• Shivakumar, B. B., Narahari, H. K., Jayasimha, P., and Sriram, A. T. 2023. Numerical study on the placement of vortex generator in a serpentine air intake duct. Sādhanā, 48(2), 81.
• Tanguy, G., MacManus, D. G., Garnier, E., and Martin, P. G. 2018. Characteristics of unsteady total pressure distortion for a complex aero-engine intake duct. Aerospace Science and Technology, 78, 297-311.
• Bae, H., Park, S., and Kwon, J. 2013. Efficient global optimization for S-duct diffuser shape design. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 227(9), 1516-1532.
• Tanguy, G., MacManus, D. G., Zachos, P., Gil-Prieto, D., and Garnier, E. 2017. Passive flow control study in an S-duct using stereo particle image velocimetry. AIAA journal, 55(6), 1862-1877.
• D’ambros, A., Kipouros, T., Zachos, P., Savill, M., and Benini, E. 2018. Computational design optimization for S-ducts. Designs, 2(4), 36.
• Furlan, F., Chiereghin, N., Kipouros, T., Benini, E., and Savill, M. 2014. Computational design of S-Duct intakes for distributed propulsion. Aircraft engineering and aerospace technology: an international journal, 86(6), 473-477.
• Bhat, S. P., and Sullerey, R. K. 2013. An assessment of turbulence models for S-duct diffusers with flow control. Gas Turbine India Conference, 5 December, 35161, Bangalore, Karnataka, India.
• Lee, J., Choi, H., Ryu, M., and Cho, J. 2015. A Study on Flow Characteristics of the Inlet Shape for the S-Duct. Journal of the Korean Society for Aeronautical & Space Sciences, 43(2), 109-117.
• Zeng, L., Pan, D., Ye, S., and Shao, X. 2019. A fast multiobjective optimization approach to S-duct scoop inlets design with both inflow and outflow. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 233(9), 3381-3394.
• Rider, C. S. 2021. “Passive Flow Control in an S-duct Intake”. M.Sc. thesis, Royal Military College of Canada, Applied Science in Aeronautical Engineering, Ontario, Canada.