Abstract
An acoustic theory is introduced into the combustion model based on the flow field equations in KIVA. The wave equation is then derived and displays the complex characteristics of three-dimensional unsteady multiple exciting sources of pressure waves in the combustion chamber. The wave equation is changed into differential discrete forms. The in-cylinder pressure fluctuation curve, obtained from the coupled calculation of the wave equation and the KIVA programme, is consistent with the experimental results. This indicates that the combination of a cylinder pressure fluctuation model and a combustion model is an effective method to study pressure oscillations.
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