余洁,陈俊华,姚建均,李凤甡,苗炳义.新型浮式防波堤水动力性能数值研究[J].海洋工程,2019,37(6):62~73
新型浮式防波堤水动力性能数值研究
Numerical research on the hydrodynamic performance of a new-type floating breakwater
  
DOI:10.16483/j.issn.1005-9865.2019.06.007
中文关键词:  浮式防波堤  S型桨叶  势波理论  运动响应  透射系数  几何参数  张力响应
英文关键词:floating breakwater  savinious blade  potential wave theory  motion response  transmission coefficient  geometric parameter  tension response
基金项目:国家海洋局专项资金(NBME2011CL02);宁波市重大科技攻关项目(2015C110015)
作者单位E-mail
余洁 浙江大学宁波理工学院 机电与能源工程学院浙江 宁波 315100 哈尔滨工程大学 机电工程学院黑龙江 哈尔滨 150001 791419671@qq.com 
陈俊华 浙江大学宁波理工学院 机电与能源工程学院浙江 宁波 315100 浙江大学 机械工程学院浙江 杭州 310058 cjh@nit.zju.edu.cn 
姚建均 哈尔滨工程大学 机电工程学院黑龙江 哈尔滨 150001  
李凤甡 浙江大学宁波理工学院 机电与能源工程学院浙江 宁波 315100 哈尔滨工程大学 机电工程学院黑龙江 哈尔滨 150001  
苗炳义 浙江大学宁波理工学院 机电与能源工程学院浙江 宁波 315100 哈尔滨工程大学 机电工程学院黑龙江 哈尔滨 150001  
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中文摘要:
      针对设计的新型双浮筒+Savinious型(S型)桨叶浮式防波堤的结构形式,基于势波理论和结构耦合水动力分析理论,利用面元积分和Newmark-β时间步进格式进行计算,研究其在线性规则波作用下的消波性能、运动响应和系泊张力响应,验证该结构的合理性。数值计算结果表明,阻尼修正后的防波堤纵摇运动响应合理,在波高H=1.5 m、波浪周期T=3 s下其消浪性能较为理想,透射系数达到0.65,同时系泊线张力呈周期响应并满足最大破断力的条件。此外,还研究了浮筒相对间距S1/L,浮筒—桨叶相对间距S2/L以及Savinious型桨叶高径比d/h三个无量纲关键几何参数对防波堤透射系数Ct和系泊线时域张力响应的影响。计算结果表明,浮筒间距S1越接近波长,防波堤消波性能越好,但迎浪侧张力响应幅值越大;随着浮筒—桨叶相对间距S2/L由0趋近于1,其透射系数随之减小,但迎浪侧张力响应幅值基本保持不变;减小桨叶的高径比d/h可以提高防波堤消波性能的稳定性,但张力响应幅值随之增大。
英文摘要:
      Aiming at a new-type standard structure of double-pontoon suspended Savinious propeller-blade floating breakwater, based on potential wave theory and structural coupled hydrodynamic analysis theory, the panel integral algorithm and Newmark-β time stepping scheme wear used to calculate its motion response, wave attenuation performance and mooring tension response under linear regular wave action, so as to verify the rationality of the structure. The numerical results show that the pitching response of the damped breakwater is reasonable, the wave dissipation performance is ideal under the wave with period T=3 s and height H=1.5 m, the transmission coefficient reaches 0.65, and the mooring line tension responds periodically and satisfies the condition of maximum breaking force. The effect of three dimensionless parameters including relative spacing of pontoons S1/L, relative spacing between pontoon and blade S2/L and height diameter ratio of Savinious blades d/h on the wave transmission coefficient Ct and time domain response of the mooring line tension was then studied. The calculation results show that the pontoon spacing S1 is closer to the wavelength, the breakwater wave dissipation performance is better, but the tension response of wave side mooring has a greater amplitude. The transmission coefficient decreases with the increase of the relative distance S2/L from 0 to 1 between pontoon and blade, but the amplitude of the wave side tension response remains basically unchanged. Decreasing the height diameter ratio d/h of blades can improve the stability of wave-absorbing performance of breakwater, but the amplitude of tension response increases accordingly.
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