CAJ | 학술논문

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＝2.74×104～2.429×105，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。
류치성공진시발생재특정결구중적류장여성장상호작용적현상。침대방형봉폐방지관결구적성공진특정개전실험，연구료주관도류속화방지관장도대봉폐방지관성공진현상적영향，획득료성공진발생구역화압력맥동특정。실험연구적3충방지관장도분별위 L/d＝5、6화7，실험적뢰낙수 R e＝2.74×104～2.429×105，마혁수 M a＝0.025～0.218。연구결과표명，성공진빈솔수류속적증가표현출빈솔쇄정특정，수방지관장도적증대，공진공황성압폭치강저，성공진빈솔강저。재본실험결구중，성공진현상발생재사특로합수위0.3～0.6화0.7～1.0적구역내。
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 × 105 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 .