Electrode Heat Transfer During Spark Ignition Depart. of Mechanical Engineering and Applied Mechanics The University of Michigan

Format:

Conference/Event

Author/Creator:

Ko, Yongseo, author.

Conference Name:

1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition (1989-09-25 : Baltimore, Maryland, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1989

Summary:

Heat transfer from the flame kernel to the electrodes during the spark ignition process is of interest for predicting the minimum ignition energy at a given engine operating condition. Experiments conducted in a constant volume bomb at near ignition limit conditions with small and large electrode surface areas (comparable to J gap plug), coupled with a phenomenological model, show the lumped heat transfer coefficient to range from 150-200 W/m2 K during the first 3 milliseconds of the ignition period. An additional analytical approach that uses the measured time dependent kernel-electrode contact areas gives reasonable agreement with the experimentally determined heat transfer coefficient and demonstrates that the dominant mechanism is thermal conduction. Heat loss from the flame kernel is comparable to the net ignition energy for the small electrodes after 3 milliseconds while that for the large electrodes is shown to equal the net ignition energy within 800 microseconds. The experiments show that electrode configuration is an important factor affecting kernel development during the ignition period

Notes:

Vendor supplied data

Publisher Number:

892083

Access Restriction:

Restricted for use by site license