【作者】 田于逵； 王小庆； 谢华； 姚惠之；

【Author】 Tian Yukui,Wang Xiaoqing,Xie Hua,Yao Huizhi (China Ship Scientific Research Center,Wuxi Jiangsu 214082,China)

【机构】 中国船舶研究中心；

【摘要】 在风洞中对水下航行体模型尾部壁面脉动压力与近壁湍动速度进行同步测试及处理分析。结果表明:航行体尾壁面脉动压力信号主频成分相对较少,且频率较为固定,反映航行体尾厚边界层流动大尺度相干结构影响;而近壁湍动速度信号反映多种不同尺度的涡作用,且低频信号占据主要的频率成分,同时,随着离壁面距离的增加,湍动速度与壁面脉动压力最大相关系数减小。测试同时考察了不同大附体方案和雷诺数变化对航行体尾湍流特性的影响。更多还原

【Abstract】 The wall pressure fluctuations and near-wall turbulent flow were jointly measured at the stem of an underwater vehicle model in CSSRC Wind Tunnel.It was revealed that,within the thick stern boundary layer,the fluctuated surface pressure contained relatively less and stable frequencies and was related directly with large scale coherence structures,while, the near-wall turbulent flow reflected the behaviors of more eddies of various scales and was characterized with the main components located in low frequency domain.The analysis of cross-correlation between the fluctuated surface pressure and near-wall turbulent flow demonstrated that,the larger the distance away from the wall,the smaller the maximal correlation coefficients.The influences of different appendages and Reynolds numbers upon the characteristics of the stem turbulence were also investigated in detail.更多还原