2 research outputs found
Evaluation of the Thermal NO formation mechanism under low-temperature diesel combustion conditions
Over the past two decades, the amount of exhaust gas pollutants emissions has been significantly reduced due to the
severe emission legislation imposed in most countries worldwide. Initial strategies simply required the employment of
simple after-treatment and engine control devices; however, as the restrictions become more stringent, these strategies
are evolving in the development of different combustion modes, specially characterized by having low-temperature combustion
characteristics. These new working conditions demand the need to check the suitability of the current NO predictive
models that coexist nowadays under standard diesel combustion characteristics, paying closer attention to the
Thermal mechanism. In order to do so, a common chemical-kinetic software was employed to simulate, for n-heptane
and methane fuels, fixed local conditions (standard diesel and low-temperature combustion) described by constant pressure,
relative mixture fraction, oxygen mass fraction and initial and final reaction temperature. The study reflects a common
trend between all the studied cases, independently of the considered local conditions, making it applicable to more
complex situations such as real NO formation processes in diesel sprays. This relationship was characterized by a
fourth-degree polynomial equation capable of substantially improving the NO prediction by just using the Thermal NO
predictive model.The authors thank the Ministerio de Ciencia e Innovacion of the Spanish government for contributing to this work with the grant BES-2009-021897.Desantes Fernández, JM.; López, JJ.; Redón Lurbe, P.; Arregle, JJP. (2012). Evaluation of the Thermal NO formation mechanism under low-temperature diesel combustion conditions. International Journal of Engine Research. 13(6):531-539. https://doi.org/10.1177/1468087411429638S53153913