有限壁厚圆管的声辐射  

Sound radiation of circular tube with finite wall thickness

作　　者：王力伟 季振林[1] WANG Liwei;JI Zhenlin(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001

出　　处：《振动与冲击》2024年第19期68-74,共7页Journal of Vibration and Shock

基　　金：广西科技重大专项(桂科AA22068065)。

摘　　要：为研究有限壁厚圆管的声辐射特性,使用二维(2D)轴对称时域计算流体动力学(computational fluid dynamics,CFD)方法计算了管口反射系数和端部修正。无限薄圆形管道计算结果与理论值吻合良好,从而证明了计算方法的正确性。研究了壁厚对管口声辐射的影响,计算结果表明,随着壁厚的增加,反射系数的幅值逐渐减小,端部修正系数则明显增大。通过对计算结果的多项式拟合,给出了反射系数和端部修正的拟合公式。最后应用该拟合公式计算管口的辐射声阻抗,结合有限元方法计算了有限壁厚膨胀腔消声器的减噪量(noise reduction,NR),通过与使用自动匹配层计算得到的结果对比,验证了拟合公式的准确性和实用性。Here,to study sound radiation characteristics of a circular tube with finite wall thickness,a 2-D axisymmetric time-domain computational fluid dynamic(CFD)method was used to calculate orifice reflection coefficient and end correction.The calculation results of infinitely thin circular pipeline agreed well with the theoretical values to prove the correctness of the calculation method.Effects of wall thickness on sound radiation of pipe mouth were studied,and the calculation results showed that with increase in wall thickness,amplitude of reflection coefficient gradually decreases,while end correction coefficient obviously increases.By fitting calculation results with polynomial,fitting formulas for reflection coefficient and end correction were deduced.Finally,fitting formulas were adopted to calculate the radiated acoustic impedance of orifice and noise reduction(NR)of a finite wall thickness expansion cavity muffler combining the finite element method.The correctness and practicality of fitting formulas were verified by comparing their results with those calculated with an automatic matching layer.

关 键 词：圆管 声辐射 反射系数 端部修正 壁厚 

分 类 号：TB535.2[理学—物理]