【作者】 张晓东；

【导师】 杜朝辉；

【作者基本信息】 上海交通大学 ， 动力机械及工程， 2007， 硕士

【摘要】 随着军用舰艇和民用船舶设计技术的发展,对于动力装置的紧凑性和低噪声的要求愈来愈高。对发动机进气系统噪声的控制目前主要采用在系统管路中加装消声器的方式。目前,我国对发动机进气消声器的研究设计,特别是在流场分析及消声器的动态特性理论研究方面还没有形成一套完整可靠和实用的设计方法。此外,传统的发动机进气系统低噪声研究常常把消声器的消声性能从进气系统中孤立出来考虑,以至于很难找到最佳的设计。因而,探索包含消声器在内的发动机进气系统的系统级低噪声优化设计方法,是提高消声器开发效率,缩短消声器开发周期的重要手段,也是对系统低噪声优化设计的重要措施。本文研究工作的主要内容包括两部分:关于燃气轮机-柴油机进气消声器单体的气动及声学性能的预估和关于包含消声器在内的进气系统级低噪声优化方法的研究。研究的主要成果包括:1.建立了进气消声器单体气动性能和声学性能数值仿真模型,可有效地进行消声器单体气动性能和在静态及进气状态下的声学性能的分析;2.设计搭建了消声器气动—声学性能实验台,设计加工了抗性消声器、微穿孔管消声器、内插穿孔管消声器和阻性消声器,并对四类消声器的气动—声学性能及影响因素进行了数值模拟分析与实验研究,对消声器的设计应用具有指导意义;3.设计搭建了管路系统气动—声学性能实验台,利用数值模拟与实验研究了含阻性消声器和进气管路的进气系统的气动—声学性能,为进气系统的低噪声系统优化提供理论支持;4.基于Powell涡声理论对复杂系统内部再生噪声的分析,为复杂管路系统低噪声的优化设计和布局提供理论支持。更多还原

【Abstract】 With the development of design technology on naval vessel and ship craft, requirements about compaction and low noise of thermal power plant become more and more strict, as well as the main way to control and reduce noise of engine intake system is installed muffler at present, but design and research of engine intake muffler in our country is not so developed compared to developed countries, especially in flow field analysis and theory research about dynamic performance of muffler. Moreover, acoustical performance of muffler has been studied separately by traditional low noise research on engine intake system and it is difficult to find a good design of muffler with good performance. So finding a way of optimum design to do the low noise research of engine intake system including muffler is an import ways to improve the design efficiency of muffler, shorten the development cycle of muffler and optimize the low noise design of engine system.Two parts of research work are included in present study mainly: aerodynamic and acoustic performance prediction of muffler and optimum design way to do the low noise research of engine intake system including muffler. The main achievements include as bellowed,1. Simulation models of aerodynamic and acoustic performance for intake muffler have been set up and acoustical performance of muffler has been analyzed at both static and steady flow conditions, as well as aerodynamic performance has also been analyzed;2. Aerodynamic & acoustic experiment test rig of muffler and four different kinds of mufflers - expansion chamber muffler, micro-perforated pipe muffler, interpolation perforated muffler and dissipative muffler have been set up and designed, as well as both simulations and experiments for these mufflers and influencing factors of their performance have been carried out;3. Aerodynamic & acoustic experiment test rig of pipe system has been set up as well as both simulations and experiments have been carried out at pipe system with dissipative muffler conditions to investigate its aerodynamic and acoustic performance.4. Regenerated noise analysis has been carried out to complex pipe system based on Powell vortex theory and it is the theory support on optimum design and distribution of complex pipe system at low noise condition.更多还原