Measurements and Predictions of the Precombustion Fluid Motion and Combustion Rates in a Spark Ignition Engine

Peter O. Witze; Jay K. Martin; Claus Borgnakke

doi:10.4271/831697

1983-10-31

Measurements and Predictions of the Precombustion Fluid Motion and Combustion Rates in a Spark Ignition Engine 831697

Laser Doppler velocimeter results are presented for the mean velocity and turbulence intensity measured in a motored research engine. The compression of complex bulk motions created during induction produces turbulence as the piston approaches top dead center. The turbulence field is shown to be isotropic but nonhomogeneous. A zero-dimensional computer simulation based on an averaged k-ϵ model is shown to adequately predict the decay of turbulence at a point in the flow after the production phase is completed.

Cylinder pressure measurements were recorded for homogeneous stoichiometric combustion for a range of engine speeds and ignition locations. A two-zone (burned and unburned gases) thermodynamic model accurately predicts the measured pressure histories when the turbulence results determined from the motored tests are used to establish initial conditions for the combustion model.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Digital $37.00 Print $37.00

Preview Document

We also recommend:

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

Measurements and Predictions of the Precombustion Fluid Motion and Combustion Rates in a Spark Ignition Engine 831697

SAE MOBILUS