Evaluating Threshold Knock with a Semi-Empirical Model—Initial Results

872149

11/01/1987

Event
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Authors Abstract
Content
In an effort to help explain knock performance in a variety of engines, a semi-empirical knock model has been developed. Making use of a “lumped-parameter” autoignition model and simple cylinder-pressure-driven thermodynamics, the model mimics the knock results obtained in an engine with a central-ignition chamber remarkably well. While additional testing against other engines is necessary to determine the generality of the model, it has already proven useful in explaining experimentally observed trends. The current work indicates that while heavy knock may occur at temperatures above 1000 K, independent of “cool-flame” chemistry, threshold knock is a 700-950 K phenomenon which can be influenced by “cool-flame” chemical activity.
Meta TagsDetails
DOI
https://doi.org/10.4271/872149
Pages
16
Citation
Najt, P., "Evaluating Threshold Knock with a Semi-Empirical Model—Initial Results," SAE Technical Paper 872149, 1987, https://doi.org/10.4271/872149.
Additional Details
Publisher
Published
Nov 1, 1987
Product Code
872149
Content Type
Technical Paper
Language
English