圆截面闭端型旁支管流致声共振数值模拟研究  

Numerical simulation of aero-acoustical resonances in side-branch ducts with circular cross-sections and closed ends

作　　者：何海平 唐科范[1,2] HE Hai-ping;TANG Ke-fan(MOE Key Laboratory of Hydrodynamics,Shanghai Jiao Tong University,Shanghai 200240,China;School of Naval Architecture,Ocean &civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学水动力学教育部重点实验室,上海200240 [2]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《水动力学研究与进展（A辑）》2018年第6期749-758,共10页Chinese Journal of Hydrodynamics

摘　　要：核电站主蒸汽管道内,高压汽流通过各管路部件,特别是流经由安全卸压阀形成的旁支管腔时,会引发流致声共振。流致高声强声波传播至蒸汽干燥器,会引起该部件声疲劳破坏。该文以系列圆截面闭端型旁支管流道为研究对象,采用CFD软件FLUENT和声学软件ACTRAN,基于CFD/CAA(DES/Lighthill)多步骤混合方法,数值模拟了各种旁支管腔引发的涡流场、等效声源场和声场,得出了流速、旁支管长度、旁支管间距、旁支管数目、旁支管与主管接口倒角等主要因素对流致声共振的影响规律,并分析了内在机理。通过与实验测试结果的比较分析,证明了所采用的流动噪声数值预报方法的适用性;同时也证明了基于该方法做系列数值计算得出的声源强度、共振频率随流道、声道和流动参数的变化规律,具有进一步应用的价值。In the main steam pipeline of the PWR, the aero-acoustical resonances will be induced, while the high pressure steam flows are passing by the various components, particularly by some side-cavities caused by the pressure relief valves. Hence, the high strength aero-acoustical waves can propagate to the steam drier, and can lead to its acoustic fatigue damage. In this paper, the numerical simulations of the aero-acoustical resonance in side-branch ducts are carried out. The simulations are based on the hybrid CFD/CAA(DES/Lighthill aero-acoustical analog) multi-step approaches, with the applications of the CFD software FLUENT and the acoustic software ACTRAN. A series of the flow channels in side-branch ducts with circular cross-sections and closed ends are used as the computational models, so as to see how the acoustical source intensities, resonant frequencies are changing with these operating conditions, through a series of numerical computations and analyses. The vortex flow-fields, equivalent sound source fields and sound fields induced by the flows over the side-branch ducts, are simulated and analyzed in detail numerically, in order to obtain the influence rules of the main operating factors to the aero-acoustical resonances, such as the flow velocity and the depth, separation distance, quantity, interface chamfering of the side-branch duct. With the comparisons between the numerical and experimental results, the applicability and feasibility of the numerical approaches for the aero-acoustical predictions are proved. And the influence rules of the parameters of the flow channels and velocities to the aero-acoustical source intensities and resonance frequencies. They are concluded through the numerical parameter studies, and also proved to have a further application value in engineering.

关 键 词：管道流动噪声 旁支管腔流致声共振 CFD/CAA混合数值模拟方法 管内结构声疲劳破坏 

分 类 号：TV131.33[水利工程—水力学及河流动力学]