新型净化消声器声学性能和流动特性研究

发布时间：2018-05-18 20:17

本文选题：净化消声器 + 声学性能　；参考：《合肥工业大学》2014年硕士论文

【摘要】：针对汽车废气和噪声排放对环境造成重大污染问题，目前最普遍的方法就是在汽车的排气系统中安装催化转化器和消声器，分别承担净化尾气排放和消除噪声的功能。为了同时达到减少汽车尾气污染排放和控制噪声的双重作用，节省空间结构，新型的净化消声器的应用将成为有效方法，因此，对净化消声器的总体性能研究，具有重要的理论意义和应用价值。本文将净化消声器的蜂窝陶瓷载体作为多孔介质处理，阐述蜂窝陶瓷载体的非理想流体的声学和动力学理论。净化消声器的声学特性和流动特性与载体的长度、分布方式、穿孔率、进口内插管长度、载体位置等结构参数相关。本文建立净化消声器有限元模型，以声学软件Virtual.Lab和流体动力学软件FLUENT为平台，研究了简单净化消声结构的声学性能和流动特性，重点分析了结构参数对其性能的影响。通过正交试验分析参数之间的关系，发现载体的长度和穿孔率对净化消声器总体性能的影响显著。通过正交试验数据结合回归分析方法，设计出净化消声器总体性能预估模型，该预估模型精度较高，很好的反映出净化消声器总体性能与结构参数的关系，为净化消声器的设计奠定基础；在此基础上，设计一款新型的复杂净化消声器，在满足催化转化的前提下，，分析了该净化消声器的声学性能和流动特性，并对此款净化消声器进行改进设计和分析，结果表明，改进后的净化消声器的整体性能得到提高。本文应用数值仿真的方法研究新型净化消声器声学性能和流动特性，探索新型净化消声器的分析和设计的关键问题，为设计高性能的净化消声器提供参考。
[Abstract]:In view of the serious environmental pollution caused by automobile exhaust gas and noise emission, the most common method is to install a catalytic converter and a muffler in the exhaust system of an automobile, which is responsible for the function of purifying exhaust gas emissions and eliminating noise, respectively. In order to reduce vehicle exhaust pollution and control noise at the same time and save space structure, the application of new purifying muffler will become an effective method. Therefore, the overall performance of purifying muffler is studied. It has important theoretical significance and application value. In this paper, the honeycomb ceramic carrier which purifies the muffler is treated as porous medium, and the acoustic and dynamic theory of the non-ideal fluid of the honeycomb ceramic carrier is expounded. The acoustic and flow characteristics of the purifying muffler are related to the structural parameters such as the length of the carrier, the distribution mode, the perforation rate, the length of the inlet tube, the position of the carrier, and so on. In this paper, the finite element model of purifying muffler is established. The acoustic performance and flow characteristics of simple purifying silencers are studied on the platform of acoustic software Virtual.Lab and hydrodynamic software FLUENT, and the influence of structural parameters on their performance is emphatically analyzed. The relationship between the parameters was analyzed by orthogonal test. It was found that the length of carrier and the perforation rate had a significant effect on the overall performance of the purifying muffler. Based on the orthogonal test data and regression analysis, a model for predicting the overall performance of a purifying muffler is designed. The prediction model has a high accuracy and reflects the relationship between the overall performance and the structural parameters of the purifying muffler. On the basis of this, a new type of complex purifying muffler is designed. Under the premise of catalytic transformation, the acoustic performance and flow characteristics of the purifying muffler are analyzed. The improved design and analysis of the purifying muffler show that the whole performance of the improved muffler has been improved. In this paper, numerical simulation method is used to study the acoustic performance and flow characteristics of a new type of purifying muffler, and to explore the key problems in the analysis and design of a new type of purifying muffler, which provides a reference for the design of a high performance purifying muffler.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.2

【参考文献】