基于有限元_边界元耦合方法的管道进口声传播及声辐射模型.pdfVIP

第25 卷第1期 航空动力学报 Vol.25 No.1 2010 年 1月 Journal of Aerospace Power Jan.2010 文章编号:1000-8055(2010)01-0136-06 基于有限元/边界元耦合方法的管道 进口 传播及 辐射模型 任志文, 侯　薇, 杜　林, 景晓东 (北京航空航天大学 能源与动力工程学院流体与 学工程实验室, 北京 100191) 摘　　　要:发展了一种基于有限元和边界元耦合方法的管道进口 传播及 辐射计算模型.该模型将整 个 场分为内部有限域和外部无界域, 分别用有限元和边界元方法求解控制方程, 在两者之间的界面上使用 具有物理意义的 阻抗参数进行匹配, 并通过一种快速迭代方法实现全 场求解.这种迭代方法可以保证有 限元刚度矩阵等带宽以及对称的特性不被破坏, 有助于提高计算效率.该模型先得到了Levine-Schwinger 标 准解的检验, 进而在无流动情况下对于简化的航发短舱进口管道模型进行了噪 辐射现象的数值模拟, 最后 基于计算结果分析了 衬对远场 辐射的影响. 关　键　词:噪 控制;航空发动机消 短舱;管道 传播;管口 辐射;有限元法;边界元法 中图分类号:O313 　　　　　文献标识码:A FEM/BEM combined model for prediction of sound propagation and radiation of a duct inlet REN Zhi-wen, HOU Wei, DU Lin, JING Xiao-dong (Fluid and Acoustic Engineering Laboratory, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China) Abstract:A finite ele ent/boundary ele ent co bined ethod has been developed for the duct acoustic proble , using finite ele ent ethod (FEM)to solve the acoustic trans- ission of inner acoustic field inside the duct, while e ploying boundary ele ent ethod (BEM)to construct the artificial boundary condition for the far field radiation co putation. The FEM and BEM were atched by the i pedance continuity condition at the interface be- tween theco putational do ains, and the co bined nu erical code was solved by a fast iter- ation algorith .The validation of the odel was first carried out by co paring the present results with the Levine-Schwinger solution for the sound radiation of a cylindrical pipe open- ing.Further ore, the present odel was used to si ulate the sound propagation and radia-