A new concept for design of the shape ship stern
Article Sidebar
Main Article Content
Abstract
The paper presents an original stern shapes design which obtaining a good distribution of the ship wake able to reduce the drag. The paper begins to present the problems directly and reversely, physical mathematical shaping and the numerical implementation (including the precision of numerical approach). For this purpose, the imagining of a current tube is suggested, with increasing variable cylindrical sections, which starts from the disk in front of the propeller, extends towards the prow, very close to the cylindrical area and which includes the entire stern section of a classic hull having practiced cross corrugated sections). Certainly, the dynamics of a cavity propeller depends on the work environment system. The flow field around a propeller mounted on the ship is very different to the one that a propeller develops when tested in free water or in a section of a cavitation tunnel. A propeller with a very performance in free water may not be right for a stern shape of a hull of the given ship. For this reason, the ship wake distribution in the propeller disk plan represents a key factor for a ship design. The study tries to draw attention and briefly focuses on ships hull’s stern flows in the light of two absolutely strict original ideas (concepts) in ship hydrodynamics, belonging to the author: 1.a new stern hydrodynamic concept (NSHC), with radial crenellated-corrugated sections 2. using of an inverse piezoelectric effect [(electric current→high-frequency power generator→ piezoelectric driver made of certain ceramic material, which induces an elliptical vibratory movement (high frequency over 20 kHz), into the elastic side plates (15 mm thickness) in the streamlines direction (of the external flowing water)], able to reduce the total forward resistance. Resuming, it can be concluded that the new concept of stern shape proposed as well as the reverse mathematical problem presented above for its optimization, based on the Levenberg-Marquardt algorithm seem to be reasonable. Finally, the most important, until now, proved result, is the reducing of propeller cavitation (working in the simulated nominal wake of the hull using the new shape stern.
Keywords: vessel wake, propeller cavitation, drag, stern shape, cavitation tunnel, ultrasonic vibrator.
Downloads
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
References
Allen, D. (2009). Memory and Place: Two Case Studies. Places(21), s. 56-61.
Bachelard, G. (2013). Mekanin Poetikası. Istanbul: Ithaki yayinlari.
Ciftci, N. (2006). Analysisi of Cengelhan Rahmi Koc Museum according to educational potentia. Ankara: Ankara Universitesi.
Downing, F. (2003). Transcending memory: remembrance and the design of place. Design Studies, (24), 213-235.
Gurler, E. E., & Ozer, B. (2013). The Effects of Public Memorials on Social Memory and Urban Identity. World Conference on Psychology and
Sociology 2012 (s. 858-863). Procedia Social and Behavioral Sciences.
Jiven, G., & Larkham, P. J. (2003). Sense of Place, authenticity and Character: A Commentary. Journal of Urban Design, (8), 67-81.
Jong, U. M. (2002). Blairgowrie: The Meaning of Place. Urban Policy and Research, 20(1).
Lynch, K. (2014). Kent Imgesi. Istanbul: Turkiye Is Bankası Kultur Yayinlari.
Mimarizm.com. (2008, 7 11). Mimarın Gobegi-Cengel Han'ın Oykusu. 02 2015 tarihinde Mimarizm Mimarlik ve Tasarım Yayın Platformu: http://www.mimarizm.com/mimaringobegi/Makale.aspx?id=708&sid=711 adresinden alındı
Mohammad, N., Saruwono, M., Said, S. Y., Ahmad, W., & Hariri, H. W. (2013). A Sense of Place within the Landscape in Cultural Settings. Asia Pacific International Conference, 506-512. London: Procedia Social and Behavioral Sciences.
Rosenberg, E. (2012). Walking in the city: memory and place. Journal of Architecture, 17(1), 131-149.
Schulz, N. C. (1980). Genius Loci Towards a Phenomenology of Architecture. New York: Rizzoli.
Sharr, A. (2013). Mimarlar Icin Heidegger. Istanbul: YEM Yayin.