【作者】 康钟绪； 季振林；

【Author】 Kang Zhongxv;Ji Zhenlin;

【机构】 哈尔滨工程大学动力与核能工程学院；

【摘要】 本文介绍了一种由Matlab编制的用于发动机排气系统声学特性和空气动力特性的快速仿真程序——Exhaust MAP。该程序利用基本的声学结构建模,采用一维平面波理论,在考虑均匀流、温度和气体阻尼效应的情况下用传递矩阵法进行排气系统声学计算;并利用各声学结构沿程阻力系数和局部阻力系数计算整个排气系统的流动阻力特性。与现有的程序相比,该程序考虑了更多的气体物理参数对声传播的影响,而且能够对排气系统的声学特性和空气动力特性同时进行仿真计算和分析。更多还原

【Abstract】 Exhaust MAP,a kind of program developed in Matlab language for quick simulation of the acoustic and dynamical performance of the engine exhaust system,is introduced in this paper.The program builds exhaust system models with basic elements,and calculates the acoustic performance by transfer matrix method on the theory of one-dimension plane wave,taking into account of the even mean flow,the temperature and the viscosity of the exhaust air.The pressure loss of the air in the system can be figured out with the coefficients of the friction resistance and part resistance.Compared with some existing programs,this program can consider more effects of physical parameters of the liquid on the sound propagation,and compute and analyse the acoustic and dynamical performance simultaneous.更多还原