温度对核电站传热管阵列声透射特性的影响  

Influence of temperature on sound transmission characteristics in heat transfer pipe array of nuclear power plant

作　　者：吕薇 姜根山[1] 刘月超[2] 张伟[1] LYU Wei;JIANG Genshan;LIU Yuechao;ZHANG Wei(North China Electric University,Beijing 102206,China;North China Electric University,Baoding 071003,Hebei,China)

机构地区：[1]华北电力大学,北京102206 [2]华北电力大学(保定),河北保定071003

出　　处：《声学技术》2022年第6期789-795,共7页Technical Acoustics

基　　金：国家自然科学基金资助项目(12074118,11674093);河北省自然基金资助项目(A2019502160);声场声信息国家重点实验室资助项目(SKLA201808)。

摘　　要：为了研究温度分布对于管阵列结构中的声透射特性的影响,以核电站的实际工况为背景,构建了不同的温度场以及周期性变化的非均匀温度场,利用有限元方法进行数值模拟。结果表明:(1)温度分布会改变管阵列声透射频谱的“禁带”宽度以及中心频率位置。在同一介质中,温度变化对频率较高位置的影响大于频率较低的位置。(2)在同样为10℃的温度差下,当水的平均声速为1 653 m·s-1、饱和水蒸气的平均声速为522.5 m·s-1时,介质为水时的禁带宽度及中心频率位置变化较大,即声速大的介质的频谱对于温度的变化更敏感。(3)当温度差在10℃以内,在周期性变化的非均匀温度场和与均匀温度场中管阵列声透射特性在第一中心频率23 996.1 Hz之前,两频谱差别很小,在第一禁带之后会出现明显区别。该研究成果对完善核电站应用的声学检测提供了理论基础。In order to study the influence of temperature distribution on the sound transmission characteristics in the pipe array structure, different temperature fields including the periodic non-uniform temperature fields are constructed according to the actual working conditions of nuclear power plant, and the finite element method is used for numerical simulation. The results show that :(1) the temperature distribution changes the width of the "gap" and the location of the center frequency in the sound transmission spectrum of pipe array, and the effect of temperature change on higher frequency locations is greater than that on lower frequency locations in the same medium;(2) in the condition that the temperature difference of 10℃ is the same, the average sound velocity of water is 1 653 m·s-1 and the average sound velocity of saturated water vapor is 522.5 m·s-1, the band gap width and the center frequency location change greatly when the medium is water, that is, the sound transmission spectrum of pipe array in the medium with large sound velocity is more sensitive to the temperature change.(3) When the temperature difference is less than 10℃, there is little difference between the two spectra before the first central frequency of 23 996.1 Hz in the non-uniform temperature field with periodic variation and in the uniform temperature field, and a significant difference will appear after the first band gap. The research results provide a theoretical basis for the improvement of acoustic detection method in nuclear power plant.

关 键 词：核电站 蒸汽发生器 声子晶体 带隙 温度场 

分 类 号：O422[理学—声学] O429[理学—物理]