Title: The pressure wave equation in KIVA during combustion process of internal combustion engines

Authors: Haiqiao Wei; Jingsi Wei; Gequn Shu

Addresses: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China ' State Key Laboratory of Engine, Tianjin University 92, Weijin Road, Naikai District, Tianjin 300072, China ' State Key Laboratory of Engine, Tianjin University 92, Weijin Road, Naikai District, Tianjin 300072, China

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.

Keywords: combustion process; combustion noise; pressure oscillation; wave equations; acoustic theory; combustion modelling; cylinder pressure fluctuation; pressure fluctuation modelling; internal combustion engines.

DOI: 10.1504/IJVD.2012.048976

International Journal of Vehicle Design, 2012 Vol.59 No.4, pp.289 - 304

Received: 06 Jan 2011
Accepted: 07 Apr 2011
Published online: 23 Apr 2013 *

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