1969-02-01

Cylinder Pressure Behavior with Runaway Surface Ignition 690517

Cylinder pressure with extremely advanced ignition was studied to gain a better understanding of runaway surface ignition.
How early ignition affects ignition lag and the effective burning time is shown on reproductions of the cylinder pressure versus time records and on replots of these data. An analysis of the polytropic process shows the change in cyclic work and heat rejection of typical cycles with progressively advancing ignition timing.
The study has contributed a technique, using the cylinder pressure level at the time of normal spark ignition, to measure runaway surface ignition, and a new approach to study the events that can lead to engine damage from this uncontrolled ignition by consideration of cyclic work.

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