A Nonlinear Quasi-3D Approach for the Modeling of Mufflers with Perforated Elements and Sound-Absorbing Material
A Nonlinear Quasi-3D Approach for the Modeling of Mufflers with Perforated Elements and Sound-Absorbing Material
复制标题
DOI：
10.1155/2013/546120
复制
发表时间：
2013-01
影响因子：
--
通讯作者：
G. Montenegro;A. D. Torre;A. Onorati;R. Fairbrother
中科院分区：
文献类型：
--
作者：
G. Montenegro;A. D. Torre;A. Onorati;R. Fairbrother
对发动机热流体动态模拟能力以及准确预测性能和声学的能力的需求不断增加，导致了从完全3D到简化的1D模型的几种方法的发展。准3D方法是作为时间要求高的3D CFD分析和快速1D方法之间的折衷方案提出的;它允许对内燃机中使用的进气和排气系统部件的声学进行建模，采用0 D单元的3D网络。由于其3D性质，该模型预测高阶模式，相对于传统的平面波方法提高了在高频的准确性。质量和能量守恒方程在单元中心求解，而动量方程应用于单元连接，包括特定的源项，以考虑吸声材料和穿孔元件。准三维方法已被验证，通过比较预测的传输损失的测量数据的一些典型的内燃机排气系统的标准配置：一个逆流室和系列室穿孔和电阻材料。
Increasing demands on the capabilities of engine thermo-fluid dynamic simulation and the ability to accurately predict both performance and acoustics have led to the development of several approaches, ranging from fully 3D to simplified 1D models. The quasi-3D approach is proposed as a compromise between the time-demanding 3D CFD analysis and the fast 1D approach; it allows to model the acoustics of intake and exhaust system components, used in internal combustion engines, resorting to a 3D network of 0D cells. Due to its 3D nature, the model predicts high-order modes, improving the accuracy at high frequencies with respect to conventional plane-wave approaches. The conservation equations of mass and energy are solved at cell centers, whereas the momentum equation is applied to cell connections including specific source term to account for the of sound-absorbing materials and perforated elements. The quasi-3D approach has been validated by comparing the predicted transmission loss to measured data for a number of standard configurations typical of internal combustion engine exhaust systems: a reverse-flow chamber and series chambers with perforates and resistive material.