内燃机燃烧过程中缸内气体的声学计算分析

he combustion noise is directly correlated with the pressure oscillations during the combustion of an IC engine, which belongs to the intensive unsteady nonlinear category. Because this kind of noise is influenced by many factors, there isn’t an effective method to simulate the complex combustion noise yet. To investigate the mechanism of the origination of combustion noise, a three dimensional wave equation is derived by using the control equation set of KIVA for deduction. The wave equation is embedded in KIVA and solved during the calculation of combustion with the source items from the main program. The acoustic oscillation process and the characteristics of those stimulative items are obtained by applying this method to a SI engine. After the comparison of the curves of each acoustic source, the contributions of source items to the combustion noise are analyzed and the regulation of acoustic oscillation in cylinder is discussed.