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Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine
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Abstract
Cycle-resolved measurements of in-cylinder air velocity have been made in a motored engine (600-r/min engine speed, 10.6:1 compression) having a high-squish reentrant-bowl piston. The velocity fluctuations have been analyzed both by low-pass/high-pass frequency filtering and by evaluation of non-stationary velocity autocorrelation functions. These two complementary analyses and general issues pertaining to their interpretation are carefully examined. The results show the existence (and substantial squish-driven intensification) of demonstrably random fluctuations whose characteristic frequencies are sufficiently high to affect mixing and combustion within individual engine cycles. There is also evidence for lower-frequency fluctuations which are organized or deterministic to some extent within individual cycles but which are not repeatably phased from cycle to cycle.
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Citation
Fansler, T. and French, D., "Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine," SAE Technical Paper 880377, 1988, https://doi.org/10.4271/880377.Also In
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