The Prediction of Ignition Delay and Combustion Intervals for a Homogeneous Charge, Spark Ignition Engine FORD MOTOR COMPANY

Format:

Conference/Event

Author/Creator:

Hires, S. D., author.

Conference Name:

1978 Automotive Engineering Congress and Exposition (1978-02-27 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1978

Summary:

Correlations for the ignition delay and combustion energy release intervals in a homogeneous charge, spark-ignited engine are developed. After incorporation within a simplified engine cycle simulation, predicted values of these two combustion parameters are compared to experimental engine data. The correlations are based on four fundamental quantities-the turbulent integral scale, the turbulent micro-scale, the turbulent intensity, and the laminar flame speed. The major assumptions include: (1) The turbulent integral scale is proportional to the instantaneous chamber height prior to flame initiation. (2) Angular momentum is conserved in the individual turbulent eddies ahead of the flame front (id est, a "rapid distortion" turbulence model). (3) The turbulent intensity scales with the mean piston speed.Two empirical constants scale the correlations to a given engine. Predicted values for the ignition delay and burn intervals show good agreement with experimental results for wide variations in engine operating and design conditions (e.g., engine speed and load, spark timing, EGR, air-fuel ratio, and compression ratio). In addition, the shapes of the predicted mass fraction burned curves agree well with published data

Notes:

Vendor supplied data

Publisher Number:

780232

Access Restriction:

Restricted for use by site license