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- It is found in this work that the Von Karman vortex street could be totally suppressed at low Reynolds number region after adding the control cylinder at proper position. 由实验之结果发现:在锥形圆柱流场之适当位置加入控制圆柱后,在低雷诺数可使其尾流之冯卡门涡街完全消失;
- So the frequency can't be simply calculated by the frequency formula of Von Karman vortex street around cylinder because Karman's formula is independent of hydrofoil's attacking angle. 尾流内存在周期性很好的类似卡门涡列的流动现象,其频率与叶片绕流状况有关,随着叶片入流角增加而增大,且属于低频范畴,因此,不能简单地采用圆柱绕流卡门涡街的频率公式进行计算。
- The vortices, known as von Karman vortices, appear when the air flow is disturbed by an object standing in the way. 这些涡旋称为冯卡门涡旋,一般在气流受到障碍物扰乱情况下出现。
- Von Karman Vortex 卡门涡
- Identification of Von Karman Vortices in the Surface Winds of Heard Island 热岛地面风中冯卡门涡流的辨别
- The von Karman constant of sediment-laden flows is one of the important parameters reflecting the influence of sediment movement on the flow structure. 挟沙水流卡门常数是反映泥沙运动对水流结构影响的重要参数之一,本文回顾并讨论了挟沙水流卡门常数的计算公式及其影响因素。
- The high temperature vortex flow - sensor is a sensitive part which is made of high temperature piezoelectric ceramics with Karman vortex theory. 高温涡街流量传感器是根据卡门涡街理论,采用高温压电陶瓷制成的敏感器件,本传感器使用PNC型改性偏铌酸铅高温压电陶瓷。
- Von Karman, T., "Progress in the Statistical Theory of Turbulence", Proceedings of the National Academy of Science, Washington,.D.C. 江正宏:"直立式含塔楼之高耸电性高塔之设计与分析",私立中原大学土木工程研究所硕士论文,民国八十八年六月。
- Karman vortex street was observed in the wake of a rough Mat plate at M=2.2.The supersonic vortex flow was investigated by optical methods. 在一块粗糙平板的超音速尾流中(M数2.;2);产生了卡门涡街。用光学方法研究了超音速卡门涡街。
- Later, make a 38-year-old on the mechanics and physics community to recognize the "Weichang equation," Von Karman, his mentor is also his. 后来38岁就弄出了力学和物理学界承认的“钱伟长方程”,他的导师冯 卡门也很赞赏他。
- This paper deals with the mechanism of Karman vortex street and calculation of vibration frequency as well as the exciting force induced by vortex. 本文阐述了卡门涡列的机理,并计算了卡门涡列振动频率及诱发的激振力大小。
- The emission frequency of the Karman vortex street occurred in series from the blades and tongue is varing with the running condition. 将流程泵叶轮叶片和压水室的隔舌看作旋涡发生体,在不同运行工况下在叶片后缘以及隔舌两侧串联发生的卡门涡街的发射频率是不同的。
- It is presented how to successfully simulate the phenomenon of Karman vortex street when fluid passes by vortex flowmeter by using FLUENT software. 摘要运用FLUENT数值仿真软件成功的模拟出流体流经涡街流量传感器时所产生的卡门涡街现象。
- The simulating results of NACA0012 airfoil in sub-critical flow and the Karman vortex street over a circular cylinder can demonstrate the validity of this method. 通过NACA0012翼型的亚临界绕流计算和低雷诺数绕圆柱流动的卡门涡阶的模拟说明了本文发展的方法的准确性。
- Steel tube transmission tower aeolian vibration is lateral motions of some circular tower members induced by Karman vortex under relatively low wind speed. 输电钢管塔的微风振动,是其部分圆截面构件在较低风速时发生的由卡门涡街引起的横风向运动。
- Based on the von Karman strainexpressions for plates and the method presented by Bergan and clough([l]),theequilibrium and incremental equations for a nonlinear analysis are derived,whichallow the consideration of the effect of the stiffener eccentricity. 根据 Von Karman 大挠度板理论以及文献[1]所提出的方法,考虑了加筋偏心的影响,获得了非线性有限元分析所需的平衡方程和增量方程。
- By using the Von Karman thin plate theory and Boltzmann superposition principle, the nonlinear equations of viscoelastic thin plate with damage are derived and denoted by the mid-plane displacements. 基于Von Karman板理论和Boltzmann线性叠加原理,建立了以中面位移表示的含损伤粘弹性板的非线性控制方程。
- The relationship between the non-dimensional drag coefficient of SMA plate face and time is presented, and the pressure distribution on and around the SMA plate surface as well as the Karman vortex configuration in the wake at a certain time are given. 给出了形状记忆合金薄板表面的流体无量纲阻力系数随时间的变化关系,同时给出了某一时刻薄板表面及其周边的压力分布和薄板尾迹中的卡门涡街形态。
- The test showed that there are Karman vortex street behind cylinder ,but the rule of shedding frenquency as strouhal number is defferent compared with that the cylinder is put into outflow. 实验结果显示,在平面叶栅风洞内的圆柱体尾流中有类似在外流中的卡门涡街脱落现象,但所对应的斯特劳哈数比外流稍小。
- This paper puts enough emphasis on the similarity in analyzing the mean velocity over a long period of time (where the long period is referred to as a cycle of the Karman Vortex Shedding). 从相似性的角度,对流速在尾流摆动一个周期内的平均值进行了分析。