Yapı ile Sınırlandırılmamış Çift Pervane Jet Etkisinde Oyulmanın Deneysel Olarak Araştırılması

Year 2024, Volume: 2 Issue: 1, 33 - 41, 30.06.2024

Amina Suljevic Erdal Kesgin

https://doi.org/10.63063/jsat.1480029

Abstract

Pervane jet akımı, liman yapılarının yakınlarında, rıhtım duvarları önünde ve kazıklı yapıların etrafında ciddi oyulma ve birikmelere neden olmaktadır. Ayrıca sığ su derinlikleri de pervane jeti oyulma miktarını artırmaktadır. Bu problemler projelendirme sırasında dikkate alınmadığı takdirde liman yapılarının temelinde ciddi oyulmalar ve buna bağlı önemli stabilite sorunları meydana getirmektedir. Bu çalışmada çift pervane jet etkisindeki oyulmaya, pervaneler ile taban arasındaki mesafe, pervane dönüş hızı ve pervaneler arası mesafenin etkisi incelenmiş ve sonuçlar karşılaştırılmıştır. Çalışma sonucunda elde edilen verilerden yola çıkarak dönüş hızı arttığında maksimum oyulmanın arttığı, pervaneler arası mesafe arttığında maksimum oyulmanın azaldığı ve pervane ile taban arasındaki mesafe arttığında maksimum oyulmanın azaldığı tespit edilmiştir. Elde edilen maksimum oyulma sonuçlarının literatür ile uyumlu olduğu tespit edilmiştir.

Keywords

Çift Pervane, Oyulma, Katı Madde Taşınımı

Supporting Institution

İstanbul Teknik Üniversitesi

Project Number

MGA-2022-44199

Thanks

Bu proje İstanbul Teknik Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü (Proje No: MGA-2022-44199) tarafından desteklenmiştir.

Experimental Study of Unconfined Twin Propeller Jet Scour

Abstract

The propeller jet flow caused to significant erosion and sedimentation near port structures, in front of quay walls, and around pile structures. Additionally, shallow water depths increase the amount of erosion caused by the propeller jet. If these problems are not considered during the design phase, serious erosion at the foundation of port structures and consequent significant stability issues may occur. In this study, the effect of erosion under twin propeller jet influence was investigated by examining the distance between propellers and the seabed, propeller propeller speed, and the distance between propellers, and the results were compared. It was found that as the propeller speed increases, the maximum erosion increases, as the distance between propellers increases, the maximum erosion decreases, and as the distance between the propeller and the seabed increases, the maximum erosion decreases. The obtained maximum erosion results were found to be consistent with the literature.

Keywords

Twin Propeller, Scour, Sediment Transport

Project Number

MGA-2022-44199

References

• G. P. Tsinker, Marine Structures Engineering: Specialized Applications, Chapman and Hallan International Thomson Publishing Company, New York, 1995.
• B. Westrich and H. Kobus, "Erosion of a uniform sand bed by continuous and pulsating jets," 1973.
• H. Kobus, P. Leister, and B. Westrich, "Flow field and scouring effects of steady and pulsating jets impinging on a movable bed," Journal of Hydraulic Research, vol. 17, no. 3, pp. 175-192, 1979.
• D. P. J. Stewart, "Characteristics of a ships screw wash and the influence of Quay wall proximity," Ph.D. dissertation, Queen’s University of Belfast, 1992.
• G. A. Hamill and J. A. McGarvey, "Designing for propeller action in harbours," in Coastal Engineering 1996, pp. 4451-4463.
• Y. M. Chiew and S. Y. Lim, "Local scour by a deeply submerged horizontal circular jet," Journal of Hydraulic Engineering, vol. 122, no. 9, pp. 529-532, 1996.
• A. Yüksel, Y. Çelikoğlu, E. Çevik, and Y. Yüksel, "Jet scour around vertical piles and pile groups," Ocean Engineering, vol. 32, no. 3-4, pp. 349-362, 2005.
• A. Yüksel, "Batık duvar jeti etkisinde kazık ve taban etkileşiminin modellenmesi," Ph.D. dissertation, Yildiz Technical University, 2007.
• J. H. Hong, Y. M. Chiew, and N. S. Cheng, "Scour caused by a propeller jet," Journal of Hydraulic Engineering, vol. 139, no. 9, pp. 1003-1012, 2013.
• R. İ. Tan, "Propeller jet induced erosion around pile supported berth structures," Ph.D. dissertation, Istanbul Technical University, 2019.
• N. Penna, F. D’Alessandro, R. Gaudio, and G. R. Tomasicchio, "Three dimensional analysis of local scouring induced by a rotating ship propeller," Ocean Engineering, vol. 188, p. 106294, 2019.
• R. Qurrain, "Influence of the sea bed geometry and berth geometry on the hydrodynamics of the wash from a ship propeller," Ph.D. dissertation, Queen’s University of Belfast, 1994.
• G. A. Hamill, H. T. Johnston, and D. P. Stewart, "Propeller wash scour near quay walls," Journal of Waterway, Port, Coastal, and Ocean Engineering, vol. 125, no. 4, pp. 170-175, 1999.
• M. Wei and Y. M. Chiew, "Influence of toe clearance on propeller scour around an open-type quay," Journal of Hydraulic Engineering, vol. 143, no. 7, p. 04017012, 2017.
• W. T. Yew, R. Hashim, and K. C. Ng, "Experimental Investigation of Scour Induced by Twin-Propeller Wash," Journal of Waterway, Port, Coastal, and Ocean Engineering, vol. 143, no. 4, p. 04017006, 2017.
• A. Mujal-Colilles, X. Gironella, A. J. C. Crespo, and A. Sanchez-Arcilla, "Study of the bed velocity induced by twin propellers," Journal of Waterway, Port, Coastal, and Ocean Engineering, vol. 143, no. 5, p. 04017013, 2017.
• Y. Cui, W. H. Lam, Z. C. Ong, L. Ling, C. L. Siow, D. Robinson, and G. Hamill, "Experimental scours by impinging twin-propeller jets at quay wall," Journal of Marine Science and Engineering, vol. 8, no. 11, p. 872, 2020.
• T. Llull, A. Mujal-Colilles, and X. Gironella, "Twin propeller time-dependent scouring processes. Physical experiments," Ocean Engineering, vol. 236, p. 109461, 2021.
• G. Curulli, T. Llull, N. Penna, A. Mujal-Colilles, X. Gironella, A. Sanchez-Arcilla, and R. Gaudio, "Relationship between eroded volume and main scour hole dimensions near quay walls caused by internal counter-rotating twin-propellers," Ocean Engineering, vol. 259, p. 111744, 2022.
• G. A. Hamill, "Characteristics of the Screw Wash of Manoeuvring Ship and the Resulting Bed Scour," Ph.D. dissertation, Queen’s University of Belfast, Northern Ireland, UK, 1987.
• R. İ. Tan and Y. Yüksel, "Seabed scour induced by a propeller jet," Ocean Engineering, vol. 160, pp. 132-142, 2018.