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Overcoming Pressure Waves to Achieve High Load HCCI Combustion
Technical Paper
2014-01-1269
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
There is significant motivation to extend the operating range of naturally aspirated HCCI combustion to high load (8-12 bar IMEP) to attain a combustion strategy with the efficiency benefits of HCCI but without the lost power density of a lean or highly diluted charge. Currently, the high-load limit of HCCI combustion is imposed by a phenomenon commonly known as ringing. Ringing results when the kinetically-driven autoignited combustion process proceeds in such a way as to form strong pressure waves which reverberate in the engine. Inhomogeneities and gradients in mixture reactivity lead certain regions to react ahead of others, and as a result, coupling can occur between a pressure wave and the reaction front. This paper seeks first to sort several related but distinct issues that impose the high load limit: ringing, engine damage, peak in-cylinder pressure, peak rate of pressure rise, and engine noise. The fundamental gasdynamics underlying the upper load limit for premixed, autoignited engines are explored and elucidated with a quasi-1D reacting compressible flow model. This model is then used to interpret published engine data in which the autoignition of premixed, stoichiometric non-dilute methane and air at 60:1 compression ratio is studied, both with and without ringing. Finally, based on the understanding gained, the model is used to propose a strategy for achieving high load, naturally aspirated, stoichiometric HCCI.
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Authors
Citation
Blumreiter, J. and Edwards, C., "Overcoming Pressure Waves to Achieve High Load HCCI Combustion," SAE Technical Paper 2014-01-1269, 2014, https://doi.org/10.4271/2014-01-1269.Also In
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