燃料棒上流体动力载荷的形成特征取决于燃料组件入口处的冷却剂流动结构

V. Perevezentsev
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引用次数: 0

摘要

采用全尺寸模型和燃料片铅仿制品对WWER-440型燃料棒的水动力振动进行了实验研究。结果表明,燃料棒梁内湍流速度不能作为决定燃料棒梁振动特性的唯一水动力特性。冷却剂通道中各种元件向燃料棒梁入口的激流的存在显著地影响了其振动强度。建立了紊流脉动能与燃料棒梁消耗机械能平衡的能量模型。在此基础上,建立了燃料棒梁振动强度与燃料棒梁入口处冷却剂湍流压力脉动水平的函数关系。燃料组件作为一个机械振动系统的建模已经引起了人们的广泛关注。同时,端元法作为空间连续系统采样中最通用的方法,得到了广泛的应用。然而,如果不描述流体与机械振动系统流线型表面的相互作用过程,就不可能分析流体动力激励振动。在大多数情况下,这些信息只能通过实验研究获得。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FEATURES OF THE FORMATION OF HYDRODYNAMIC LOADS ON THE FUEL RODS DEPENDING ON THE STRUCTURE OF THE COOLANT FLOW AT THE ENTRANCE TO THE FUEL ASSEMBLY WWER
Experimental studies of hydrodynamic induced of fuel rods vibrations WWER-440 tweers using a full-scale mock-up with lead imitators of fuel tablets have been carried out. It is shown that the speed of the turbulent flow in the fuel rods beam cannot be the only hydrodynamic characteristic that determines the vibrational characteristics of the fuel rods beams. The presence of indignant flow of various elements of the tract of the coolant to the fuel rods beams inlet significantly affects the intensity of their vibrations. An energy model of the balance of pulsating energy of turbulent flow and expendable mechanical energy to the fuel rods beams has been developed. On the basis of the proposed model, a functional connection of the intensity of the vibrations of the fuel rods beams with the levels of pressure pulsations in the turbulent flow of the coolant at the entrance to the fuel rods beams is established. The modelling of Fuel Assembly (FA) as a mechanical vibrational system has received considerable attention. At the same time, the end-element methods, as the most universal for the sampling of spatial continual systems, have become widespread. However, the analysis of hydrodynamically excited vibrations is impossible without describing the processes of interaction of the flow with the streamlined surfaces of the mechanical vibration system. In most cases, such information can be obtained only through experimental research.
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