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Download fileNumerical Study of the Influence of the Photochemical Activation of Oxygen Molecules on Homogeneous Charge Compression Ignition Performance
journal contribution
posted on 30.06.2017, 00:00 authored by A. M. Starik, V. E. Kozlov, N. S. TitovaNumerical
analysis of the possibility of the combustion enhancement
in a homogeneous charge compression ignition (HCCI) engine operating
on methane via the production of O2(a1Δg) molecules or O atoms by resonance laser radiation in the
5 mm thickness layer, located near the cylinder head, is conducted
for both the nominal- and low-load regimes. It is shown that the abundance
of both singlet delta oxygen and atomic oxygen in such a layer substantially
accelerates ignition phasing, enhances the combustion, and reduces
the pollutant emission. Moreover, the advance in the specific work
in these cases is higher than the energy put into the gas for producing
O2(a1Δg) molecules or O atoms.
In doing so, the production of O2(a1Δg) molecules is more effective for the combustion enhancement
in a HCCI engine. At a low-load regime, the production of O2(a1Δg) molecules makes it possible to
extend the range of stable combustion, to increase notably the engine
power (by a factor of 1.4), and to reduce by a few times the emissions
of CO, unburnt hydrocarbons, and organic compounds.