Abstract
Araç yakıt tüketim değerlerini doğrudan etkileyen araç aerodinamiği aynı zamanda araç stabilitesi, hızlanma yeteneği, araç sesi ve çevre kirliliği açısından büyük öneme sahiptir. Ahmed cismi jenerik araç modeli akışkanlar mekaniği ve araç aerodinamiği konusunda yapılan çalışmalarda çok fazla kullanılmaktadır. Akış kontrol yöntemlerinin numerik olarak araştırıldığı bu çalışmada sonuçlar deneysel veriler referans alınarak doğrulanmıştır. Bu çalışmada çukurcuklama olarak bilinen pasif akış kontrol yöntemi 35°arka eğimli Ahmed modeli üzerinde test edilmiştir. Analizler 2.4 milyon mesh sayısı ile çözümlenmiş olup, çukurcuklu yüzeylerin kullanılması ile en iyi modelde sürükleme kuvveti katsayısında 3.5% azalma elde edilmiştir. Aynı zamanda bu çalışmanın aerodinami açısından anlamlı olması için uygulanan bu çukur yüzeylerin günümüz araçlarına uygulanabilirliği ve üretilebilirlik faktörü de değerlendirilmiştir.
Keywords
Sürükleme kuvveti katsayısı Kaldırma kuvveti katsayısı Araç aerodinamiği Hesaplamalı akışkanlar dinamiği(CFD) Ahmed cismi
Project Number
FYL-2021-13513
References
- Abd-Alla GH. Using exhaust gas recirculation in internal combustion engines: a review. Energy Conversion and Management 2002; 43: 1027-1042.
- Ahmed SR., Ramm G., Faltin G. Some salient features of the time-averaged ground vehicle wake. SAE Transactions 1984; 93(2): 473-503.
- Altaf A., Omar AA., Asrar W. Review of passive drag reduction techniques for bluff road vehicles. IIUM Engineering Journal 2014; 15(1): 61-69.
- Bayraktar I., Landman D., Baysal O. Experimental and computational investigation of Ahmed body for ground vehicle aerodynamics. Journal of Commercial Vehicles 2001; 110(2): 321-331.
- Bing-xin W., Zhi-gang Y., Hui Z. Active flow control on the 25°Ahmed body using a new unsteady jet. International Journal of Heat and Fluid Flow 2019; 79: 108459.
- Brady M., Browand F., Hammache M., Heineck JT., Leonard A., McCallen R., Ross J., Rutledge W., Salari K., Storms B. Progress in reducing aerodynamic drag for higher efficiency of heavy-duty trucks (Class 7-8). Lawrence Livermore National Laboratory Technical Report UCRL-JC-132873 1999; California, United States.
- Chear CK., Dol SS. Vehicle aerodynamics: Drag reduction by surface dimples. International Journal of Mechanical and Mechatronics Engineering 2015; 9(1): 202 – 205.
Abstract
Vehicle aerodynamics which directly affects fuel consumption values in vehicles has great importance in terms of vehicle stability, acceleration ability, vehicle noise, and environmental pollution. Ahmed car model is one of the most important generic models, so this popular car model is widely used in the literature on fluid mechanics and vehicle aerodynamics studies. This study investigates the effect of a passive drag reduction technique which is known as dimple surface, on Ahmed car model with a 35° slant angle. The flow control methods were applied numerically also these methods were compared with similar works. Analysis made in this study were conducted with 2.4 million cell numbers and the maximum drag reduction is 3.5 % with optimum dimple surfaces. Moreover, the applicability and manufacturability factors were also evaluated in terms of implementing the dimpling modification to today’s current road vehicles.
Keywords
Drag coefficient Lift coefficient Aerodynamics Computational fluid dynamics(CFD) Ahmed body
Ethical Statement
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. No experiments were carried out involving human tissue.
Supporting Institution
Cukurova University Scientific Research Project Coordination
Project Number
FYL-2021-13513
Thanks
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to thank the Cukurova University Scientific Research Project Coordination (Project ID: FYL-2021-13513) for financial support to this study.
References
- Abd-Alla GH. Using exhaust gas recirculation in internal combustion engines: a review. Energy Conversion and Management 2002; 43: 1027-1042.
- Ahmed SR., Ramm G., Faltin G. Some salient features of the time-averaged ground vehicle wake. SAE Transactions 1984; 93(2): 473-503.
- Altaf A., Omar AA., Asrar W. Review of passive drag reduction techniques for bluff road vehicles. IIUM Engineering Journal 2014; 15(1): 61-69.
- Bayraktar I., Landman D., Baysal O. Experimental and computational investigation of Ahmed body for ground vehicle aerodynamics. Journal of Commercial Vehicles 2001; 110(2): 321-331.
- Bing-xin W., Zhi-gang Y., Hui Z. Active flow control on the 25°Ahmed body using a new unsteady jet. International Journal of Heat and Fluid Flow 2019; 79: 108459.
- Brady M., Browand F., Hammache M., Heineck JT., Leonard A., McCallen R., Ross J., Rutledge W., Salari K., Storms B. Progress in reducing aerodynamic drag for higher efficiency of heavy-duty trucks (Class 7-8). Lawrence Livermore National Laboratory Technical Report UCRL-JC-132873 1999; California, United States.
- Chear CK., Dol SS. Vehicle aerodynamics: Drag reduction by surface dimples. International Journal of Mechanical and Mechatronics Engineering 2015; 9(1): 202 – 205.
Details
| Primary Language | English |
|---|---|
| Subjects | CAD/CAM Systems |
| Journal Section | RESEARCH ARTICLES |
| Authors | |
| Project Number | FYL-2021-13513 |
| Publication Date | June 25, 2024 |
| Submission Date | November 8, 2023 |
| Acceptance Date | February 28, 2024 |
| Published in Issue | Year 2024 Volume: 7 Issue: 3 |
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