楔形物体在静水与波浪中自由入水砰击试验研究
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摘要
通过自由落体的入水方式,分别在静水和规则波中开展了两种不同横剖面的曲面楔形体入水砰击问题试验研究。使用高速摄像系统记录楔形体入水过程流场演变和运动特性,采用加速度传感器和压力传感器进行数据的动态采集。试验结果表明,在静水中入水时,外凸剖面楔形体入水砰击后模型两侧的射流飞溅比反曲剖面更剧烈,而在楔形体前端的水面以下部分形成的气腔更小;在规则波中入水时,对于相同模型,在波峰和上跨零点相位下模型入水砰击后两侧的射流飞溅比在波谷相位更剧烈。相同工况时,反曲剖面模型所受砰击的加速度峰值和压力峰值更小;在相同的入水速度下,对于相同模型,波浪载荷和砰击载荷的共同作用会使模型所受砰击压力显著增大。
The slamming problem of the wedge with two different cross-sections in still water and wave was studied by using gravity free-falling method. The high speed camera system was used to record the flow field evolution and motion characteristics in the process of water entry. Acceleration and pressure sensors were used for dynamics data acquisition. The experiments results show that the jet splashing produced by the convex cross section wedge is more intense than the retro-flexion profile under still water condition.Meanwhile,the air cavity area produced in the underwater part of the model front is smaller. However,for the same test model under regular wave condition,the jet splashing of wave crest and zero crossing point phase are more intense than wave trough. Under the same condition,the slamming acceleration peak and pressure peak by the retro-flexion profile wedge are smaller than the convex profile model. Furthermore,the slamming pressure significantly increases due to the coupling effect of the wave load and the slamming load under the same water entry velocity.
The slamming problem of the wedge with two different cross-sections in still water and wave was studied by using gravity free-falling method. The high speed camera system was used to record the flow field evolution and motion characteristics in the process of water entry. Acceleration and pressure sensors were used for dynamics data acquisition. The experiments results show that the jet splashing produced by the convex cross section wedge is more intense than the retro-flexion profile under still water condition.Meanwhile,the air cavity area produced in the underwater part of the model front is smaller. However,for the same test model under regular wave condition,the jet splashing of wave crest and zero crossing point phase are more intense than wave trough. Under the same condition,the slamming acceleration peak and pressure peak by the retro-flexion profile wedge are smaller than the convex profile model. Furthermore,the slamming pressure significantly increases due to the coupling effect of the wave load and the slamming load under the same water entry velocity.
引文
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[15] RAO C P,WAN D C. Numerical study of the wave-induced slamming force on the elastic plate based on MPS-FEM coupled method[J]. Journal of Hydrodynamics,2018,30(1):70-78.
[16] STAVOVY A B,CHUANG S L,Analytical determination of slamming pressures for high-speed vehicles in waves[J]. Journal of Ship Research,1976,20(4):190-198.
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[18]陈小平,李军伟,王辉,等.大尺度楔形体板架钢模落体试验和仿真研究[J].船舶力学,2012,16(10):1152-1163.(CHEN Xiaoping,LI Junwei,WANG Hui,et al. Experiments and numerical investigation of water entry of large-scale steel wedge models[J]. Journal of Ship Mechanics,2012,16(10):1152-1163.(in Chinese))
[19] PANCIROLI R,ABRATE S,MINAK G,et al. Hydroelasticity in water-entry problems:Comparison experimental and SPH results[J]. Composite Structures,2012,94(2):532-539.
[20] PANCIROLI R,SHAMS A,PORFIRI M. Experiments on the water entry of curved wedges:High speed imaging and part image velocimetry[J]. Ocean Engineering,2015,94:213-222.
[21] Al AOUI A,NEME A,SCOLAN Y M. Experimental investigation of hydrodynamic loads and pressure distribution during a pyramid water entry[J]. Journal of Fluids Investigation and Structures,2015,54:925-935.
[22] BARJASTEH M,ZERAATGAR H,JAVAHERIAN M J. An experimental study on water entry of asymmetric wedges[J].Applied Ocean Research,2016,58:292-304.
[23] REN B,LIU M,LI X L,et al. Experimental investigation of wave slamming on an open structure supported elastically[J].China Ocean Engineering,2016,30(6):967-978.
[2]王永虎,石秀华.入水冲击问题研究的现状与进展[J].爆炸与冲击,2008,28(3):276-282.(WANG Yonghu,SHI Xiuhua. Review on research and development of water-entry impact problem[J]. Explosion and Shock Waves,2008,28(3):276-282.(in Chinese))
[3] VON KARMAN T. The impact on seaplane floats during landing[R]. National Advisory Committee for Awronautics,1929,321:145-162.
[4] WAGNER V H. Phenomena associated with impacts and sliding on liquid surfaces[J]. Zeitschrift Fur Angewandte Mathematik Und Mechanik,1932,12(4):193-215.
[5] HOWISON S D,OCKENDON J R,WILSON S K. Incompressible water-entry problem at small deadrise angles[J]. Journal of Fluid Mechanics,1991,222:215-230.
[6] RICCARDI G,IAFRATI A. Water impact of an asymmetric floating wedge[J]. Journal of Engineer Mathematics,2004,49(1):19-39.
[7]孙士丽,吴国雄.有限水深中非轴对称体斜向入水砰击问题研究[J].水动力学研究与进展,2013,28(4):445-452.(SUN Shili,WU Guoxiong. Oblique entry of non-axisymmetric bodies into water of finite depth[J]. Chinese Journal of Hydrodynamics,2013,28(4):445-452.(in Chinese))
[8]于龙超,闫发锁,赵九龙,等.不同曲率球面体入水砰击载荷数值计算[J].海洋工程,2016,34(1):33-39.(YU Longchao,YAN Fasuo,ZHAO Jiulong,et al. Numerical calculation of slamming load for different curvature of the sphere[J].The Ocean Engineering,2016,34(1):33-39.(in Chinese))
[9] GEERS T L. A boundary-element method for slamming analysis[J]. Journal of Ship Research,1982,26(2):117-124.
[10] WANG J,LUGNI C,FALTINSEN O M. Experimental and numerical investigation of a freefall wedge vertically entering the water surface[J]. Applied Ocean Research,2015,51:181-203.
[11]王珏,邱流潮.应用基于GPU的SPH方法模拟二维楔形体入水砰击问题[J].计算力学学报,2013,30(S1):174-177.(WANG Jue,QIU Liuchao. Application of the GPU-based SPH method to the simulation of water entry of 2D wedge bodies[J].Chinese Journal of Computational Mechanics,2013,30(S1):174-177.(in Chinese))
[12] YANG L,YANG H,YAN S Q,et al. Numerical investigation of water-entry problems using IBM method[J]. Internal Journal of Offshore and Polar Engineering,2017,27(2):152-159.
[13]王平,袁帅,张宁川,等.楔形体在波浪中自由入水的数值模拟[J].海洋工程,2017,35(5):42-50.(WANG Ping,YUAN Shuai,ZHANG Ningchuan,et al. Numerical study of the free water-entry wedge in wave[J]. The Ocean Engineeing,2017,35(5):42-50.(in Chinese))
[14] CHATJIGEORGIOU I K,KOROBKIN A A,COOKER M J. Three-dimensional steep wave impact on a vertical plate with an open rectangular section[J]. International Journal of Mechanical Sciences,2017,133:260-272.
[15] RAO C P,WAN D C. Numerical study of the wave-induced slamming force on the elastic plate based on MPS-FEM coupled method[J]. Journal of Hydrodynamics,2018,30(1):70-78.
[16] STAVOVY A B,CHUANG S L,Analytical determination of slamming pressures for high-speed vehicles in waves[J]. Journal of Ship Research,1976,20(4):190-198.
[17]孙辉,卢炽华,何友声.二维楔形体冲击入水时的流固耦合响应的实验研究[J].水动力学研究与进展,2003,18(1):104-109.(SUN Hui,LU Zhihua,HE Yousheng. Experimental research on the fluid-structure interaction in water entry of 2D elastic wedge[J]. Chinese Journal of Hydrodynamics,2003,18(1):104-109.(in Chinese))
[18]陈小平,李军伟,王辉,等.大尺度楔形体板架钢模落体试验和仿真研究[J].船舶力学,2012,16(10):1152-1163.(CHEN Xiaoping,LI Junwei,WANG Hui,et al. Experiments and numerical investigation of water entry of large-scale steel wedge models[J]. Journal of Ship Mechanics,2012,16(10):1152-1163.(in Chinese))
[19] PANCIROLI R,ABRATE S,MINAK G,et al. Hydroelasticity in water-entry problems:Comparison experimental and SPH results[J]. Composite Structures,2012,94(2):532-539.
[20] PANCIROLI R,SHAMS A,PORFIRI M. Experiments on the water entry of curved wedges:High speed imaging and part image velocimetry[J]. Ocean Engineering,2015,94:213-222.
[21] Al AOUI A,NEME A,SCOLAN Y M. Experimental investigation of hydrodynamic loads and pressure distribution during a pyramid water entry[J]. Journal of Fluids Investigation and Structures,2015,54:925-935.
[22] BARJASTEH M,ZERAATGAR H,JAVAHERIAN M J. An experimental study on water entry of asymmetric wedges[J].Applied Ocean Research,2016,58:292-304.
[23] REN B,LIU M,LI X L,et al. Experimental investigation of wave slamming on an open structure supported elastically[J].China Ocean Engineering,2016,30(6):967-978.