Effect of bow spray strips and Ω-type freeboard on high-speed boats
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摘要: 快艇在高速航行时会产生剧烈的艏部兴波和干舷淹湿问题,通常需要采用适当的压浪措施来控制这些不利因素。为进一步研究干舷压浪技术在高速艇上的应用效果并与船艏压浪技术进行对比,基于某一细长高速穿浪船,对比这2种压浪技术对船体兴波、淹湿、运动、稳性和高速下横倾回复力矩的影响。船体淹湿、阻力和船体运动通过求解URANS方程和使用动网格技术获得,高速下的横倾回复力矩也通过求解URANS方程获得。计算结果表明,2种压浪技术均能有效控制船体淹湿,但干舷压浪设计能在船长范围内控制船体淹湿并具有更好的初稳性,在高速下也有更大的横倾回复力矩。自航模试验也验证了压浪干舷的可行性和良好性能。Abstract: A high-speed boat may encounter severe wave-making at the bow and become wetter at high speed. Some measures can be taken to overcome these disadvantages. In order to compare the effect of bow spray strips and Ω-type freeboards on a high-speed boat, hull wetness, resistance, hull motion, stability and the restoring moment of the heel at high speed of models with these two kinds of auxiliaries were calculated and measured. CFD methods and model tests were adopted. Both of these two auxiliaries can reduce hull wetness, and the model with a Ω-type freeboard has a better initial stability and larger restoring moment of the heel at high speed. A free running model test also indicates that the Ω-type freeboard has a fine performance.
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Key words:
- high-speed boat /
- Ω-type freeboard /
- hull wetness /
- stability /
- restoring moment of heel /
- numerical tank test
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表 1 计算模型主尺度
Table 1. Main dimensions of the hull model
项目 数值 总长Loa/ m 2.746 水线长L/ m 2.708 水线宽B/ m 0.333 吃水T/m 0.133 质量M/t 0.047 -
[1] 邵世明, 王云才, 陈良权.首压浪条对高速排水型艇航行性能的影响[J].上海交通大学学报, 1980(3):83-91. http://www.cnki.com.cn/Article/CJFDTOTAL-SHJT198003006.htmSHAO S M, WANG Y C, CHEN L Q. The effects of bow spray strips on resistance and seakeeping qualities of high-speed displacement hull[J]. Journal of Shang-hai Jiaotong University, 1980(3):83-91(in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-SHJT198003006.htm [2] THOMPSON A. Boat:6116180A[P]. 2000-09-12. [3] 魏成柱, 李英辉, 易宏.楔形压浪体在内倾式船首中的应用研究[J].船舶工程, 2013, 35(1):9-12. http://www.cnki.com.cn/Article/CJFDTOTAL-CANB201301004.htmWEI C Z, LI Y H, YI H. Application research of an-ti-green-water wedge to intilted bow[J]. Ship Engi-neering, 2013, 35(1):9-12(in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-CANB201301004.htm [4] 王健, 刘旌扬, 魏成柱, 等.新概念穿梭艇自航模操控系统试验研究[J].中国舰船研究, 2016, 11(1):95-101. http://www.ship-research.com/CN/abstract/abstract1506.shtmlWANG J, LIU J Y, WEI C Z, et al. Experimental study on the control system for the free-running model test of a new concept shuttle vessel[J]. Chinese Journal of Ship Research, 2016, 11(1):95-101(in Chinese). http://www.ship-research.com/CN/abstract/abstract1506.shtml [5] WEI C Z, LI Y H, YI H. CFD and EFD based studies of hull wetness of fast Mono-WPC[C]//36th Interna-tional Conference on Ocean, Offshore and Arctic Engi-neering (OMAE2016). Busan, South Korea, 2016. [6] 魏成柱, 毛立夫, 李英辉, 等.单体半滑行穿浪船船型与静水航行性能[J].中国舰船研究, 2015, 10(5):16-21. http://www.ship-research.com/CN/abstract/abstract1422.shtmlWEI C Z, MAO L F, LI Y H, et al. Analysis of the hull form and sailing characters in calm water of a semi-planing wave-piercing boat[J]. Chinese Journal of Ship Research, 2015, 10(5):16-21(in Chinese). http://www.ship-research.com/CN/abstract/abstract1422.shtml [7] LARSSON L, STERN F, VISONNEAU M. Numerical ship hydrodynamics:an assessment of the Gothenburg 2010 workshop[M]. Netherlands:Springer, 2014. [8] 魏成柱.穿梭艇性能特征与船型优化[D].上海:上海交通大学, 2013.WEI C Z. The shuttle vessel performance characteris-tics and hull form optimization[D]. Shanghai:Shang-hai Jiao Tong University, 2013(in Chinese). [9] MENTER F R. Two-equation eddy-viscosity turbu-lence models for engineering applications[J]. AIAA Journal, 1994, 32(8):1598-1605. doi: 10.2514/3.12149 [10] HIRT C W, NICHOLS B D. Volume of fluid (VOF) method for the dynamics of free boundaries[J]. Jour-nal of Computational Physics, 1981, 39(1):201-225. doi: 10.1016/0021-9991(81)90145-5 [11] YOUSEFI R, SHAFAGHAT R, SHAKERI M. High-speed planing hull drag reduction using tunnels[J]. Ocean Engineering, 2014, 84:54-60. doi: 10.1016/j.oceaneng.2014.03.033 -
2017-1-14_en.pdf
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