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The Effect of Spark Location on Combustion in a Variable-Swirl Engine
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<div class="htmlview paragraph">Measurements are presented showing the effect of swirl level and spark location on burn duration in a homogeneous-charge engine. Laser shadowgraph photographs of the flame structure were used to help interpret the observed results. As expected, without swirl the burn duration was a direct function of flame travel distance, such that central ignition was optimal. When swirl was introduced, off-axis ignition was aided by flame-holder effects that enhanced the flame speed in the circumferential direction. However, only for the highest swirl level studied (swirl number = 8.3) was the burn rate increased by moving the ignition point toward the cylinder wall. For lower swirl levels, central ignition was still preferable.</div>
Title: The Effect of Spark Location on Combustion in a Variable-Swirl Engine
Description:
<div class="htmlview paragraph">Measurements are presented showing the effect of swirl level and spark location on burn duration in a homogeneous-charge engine.
Laser shadowgraph photographs of the flame structure were used to help interpret the observed results.
As expected, without swirl the burn duration was a direct function of flame travel distance, such that central ignition was optimal.
When swirl was introduced, off-axis ignition was aided by flame-holder effects that enhanced the flame speed in the circumferential direction.
However, only for the highest swirl level studied (swirl number = 8.
3) was the burn rate increased by moving the ignition point toward the cylinder wall.
For lower swirl levels, central ignition was still preferable.
</div>.
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