Analysis of Premixed Charge Compression Ignition Combustion With a Sequential Fluid Mechanics-Multizone Chemical Kinetics Model

2005-01-0115

04/11/2005

Event
SAE 2005 World Congress & Exhibition
Authors Abstract
Content
We have developed a methodology for analysis of Premixed Charge Compression Ignition (PCCI) engines that applies to conditions in which there is some stratification in the air-fuel distribution inside the cylinder at the time of combustion. The analysis methodology consists of two stages: first, a fluid mechanics code is used to determine temperature and equivalence ratio distributions as a function of crank angle, assuming motored conditions. The distribution information is then used for grouping the mass in the cylinder into a two-dimensional (temperature-equivalence ratio) array of zones. The zone information is then handed on to a detailed chemical kinetics model that calculates combustion, emissions and engine efficiency information. The methodology applies to situations where chemistry and fluid mechanics are weakly linked. The results of the multi-zone model have been compared to the results obtained from a fully integrated code, in which a chemical kinetics code is directly linked into a fluid mechanics code to calculate chemistry in every cell of the grid.
The results show that the multi-zone model predicts burn duration and peak cylinder pressure with good accuracy. However, ignition timing predicted by the multi-zone model is sensitive to the transition angle between the fluid mechanics code and the chemical kinetics code. The paper explores the possibility of using different criteria for determining the transition angle. The results show that the criteria have some validity for predicting transition. Further research is necessary to investigate the effect of fuel properties and operating conditions on transition angle.
Meta TagsDetails
DOI
https://doi.org/10.4271/2005-01-0115
Pages
13
Citation
Aceves, S., Flowers, D., Espinosa-Loza, F., Babajimopoulos, A. et al., "Analysis of Premixed Charge Compression Ignition Combustion With a Sequential Fluid Mechanics-Multizone Chemical Kinetics Model," SAE Technical Paper 2005-01-0115, 2005, https://doi.org/10.4271/2005-01-0115.
Additional Details
Publisher
Published
Apr 11, 2005
Product Code
2005-01-0115
Content Type
Technical Paper
Language
English