方形封闭旁支管流致声共振实验研究  

Experimental Study of Flow-induced Acoustic Resonance in Square Closed Side Branch

作　　者：张辉[1] 张锴[2] 顾汉洋[1] 刘晓晶[1] 谢永诚[2] 祖洪彪[2] 

机构地区：[1]上海交通大学核科学与工程学院,上海200240 [2]上海核工程研究设计院,上海200233

出　　处：《原子能科学技术》2014年第1期86-91,共6页Atomic Energy Science and Technology

摘　　要：流致声共振是发生在特定结构中的流场与声场相互作用的现象。针对方形封闭旁支管结构的声共振特征开展实验，研究了主管道流速和旁支管长度对封闭旁支管声共振现象的影响，获得了声共振发生区域和压力脉动特征。实验研究的3种旁支管长度分别为 L/d＝5、6和7，实验的雷诺数 R e＝2.74×10^4～2.429×10^5，马赫数 M a＝0.025～0.218。研究结果表明，声共振频率随流速的增加表现出频率锁定特征，随旁支管长度的增大，共振工况声压幅值降低，声共振频率降低。在本实验结构中，声共振现象发生在斯特鲁哈数为0.3～0.6和0.7～1.0的区域内。Flow-induced acoustic resonance is a phenomenon caused by the interaction of flow and acoustic fields in special structure . Acoustic resonance characteristic experiments were carried out on square closed side branch . The influences of the velocity in main pipe and the length of the side branch on acoustic resonance were studied . The range of occurrence and characteristics of pressure pulsation were analyzed .Three lengths of side branches （L/d= 5 ,6 and 7） were experimentally studied and the Reynolds number in the experiment was 2.74 ×104^-2.429×10^5 while the Mach number was 0.025-0.218 .The results show that the resonance frequency shows a lock-in phenomenon with the increase of velocity . As the length of the side branch increasing ,the amplitude of the acoustic pressure and the resonance frequency decrease . In the considered structure ,the acoustic resonance occurs w hen Strouhal number is 0.3-0.6 and 0.7-1.0 .

关 键 词：流致声共振 封闭旁支管 斯特鲁哈数 

分 类 号：TL334[核科学技术—核技术及应用]