A Closed Cycle Simulation Model with Particular Reference to Two-Stroke Cycle Engines

911847

09/01/1991

Event
International Off-Highway & Powerplant Congress & Exposition
Authors Abstract
Content
A quasi-dimensional computer simulation model is presented to simulate the thermodynamic and chemical processes occurring within a spark ignition engine during compression, combustion and expansion based upon the laws of thermodynamics and the theory of equilibrium. A two-zone combustion model, with a spherically expanding flame front originating from the spark location, is applied. The flame speed is calculated by the application of a turbulent entrainment propagation model. A simplified theory for the prediction of in-cylinder charge motion is proposed which calculates the mean turbulence intensity and scale at any time during the closed cycle. It is then used to describe both heat transfer and turbulent flame propagation. The model has been designed specifically for the two-stroke cycle engine and facilitates seven of the most common combustion chamber geometries. The fundamental theory is nevertheless applicable to any four-stroke cycle engine.
The model has been evaluated by the comparison of measured and predicted pressure traces and heat release rates. The results show good agreement across the whole data set.
Meta TagsDetails
DOI
https://doi.org/10.4271/911847
Pages
14
Citation
Reid, M., and Douglas, R., "A Closed Cycle Simulation Model with Particular Reference to Two-Stroke Cycle Engines," SAE Technical Paper 911847, 1991, https://doi.org/10.4271/911847.
Additional Details
Publisher
Published
Sep 1, 1991
Product Code
911847
Content Type
Technical Paper
Language
English