Phenomenological autoignition model for diesel sprays using reduced chemical kinetics and a characteristic scalar dissipation rate
dc.contributor.author | Dempsey, AB | |
dc.contributor.author | Fiveland, SB | |
dc.contributor.author | Post, SL | |
dc.date.accessioned | 2017-12-11T21:10:40Z | |
dc.date.available | 2017-03-28 | |
dc.date.issued | 2017-04 | |
dc.description.abstract | This study focuses on the development of an autoignition model for diesel sprays that is applicable to phenomenological multi-zone combustion models. These models typically use a single-step Arrhenius expression to represent the low-temperature chemistry leading up to autoignition. There has been a substantial amount of work done in the area of n-heptane autoignition in homogeneous mixtures. Reduced kinetic mechanisms with ten reactions or less have been proposed in the literature to represent the complex low-temperature oxidation of n-heptane. These kinetic models are attractive for multi-zone simulations because of the low number of reactions involved. However, these kinetic mechanisms and the multi-zone treatment of the fuel spray do not account for the effect of turbulence/chemistry interactions on the chemical reaction rate. In this work a correlation has been developed for the total ignition delay time that is a combination of the homogenous ignition delay and dissipation effects. The homogeneous ignition delay is predicted from a chemical reaction mechanism for n-heptane, and the dissipation effects are captured through a phenomenological expression for a characteristic scalar dissipation rate. The characteristic scalar dissipation rate includes effects of injection pressure, ambient density, and injector hole size. The characteristic scalar dissipation rate is compared to a critical scalar dissipation rate to assess the additional delay due to turbulence/chemistry interactions. The autoignition model was implemented into a multi-zone spray model and validated against constant volume ignition delay measurements of diesel sprays. | |
dc.format.extent | pp.512-528, 17 pages | |
dc.identifier.citation | Dempsey, A.B., Fiveland, S.B., & Post, S.L. (2017). Phenomenological autoignition model for diesel sprays using reduced chemical kinetics and a characteristic scalar dissipation rate. SAE International Journal of Engines, 10(2), 512-528. doi:10.4271/2017-01-0523 | |
dc.identifier.doi | 10.4271/2017-01-0523 | |
dc.identifier.issn | 1946-3944 | |
dc.identifier.uri | https://hdl.handle.net/10182/8844 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | SAE International | |
dc.relation | The original publication is available from SAE International - https://doi.org/10.4271/2017-01-0523 - http://dx.doi.org/10.4271/2017-01-0523 | |
dc.relation.isPartOf | SAE International Journal of Engines | |
dc.relation.uri | https://doi.org/10.4271/2017-01-0523 | |
dc.rights | © 2017 SAE International | |
dc.subject | simulation and modeling | |
dc.subject | diesel fuels | |
dc.subject | fuel injection | |
dc.subject | combustion and combustion processes | |
dc.title | Phenomenological autoignition model for diesel sprays using reduced chemical kinetics and a characteristic scalar dissipation rate | |
dc.type | Journal Article | |
lu.contributor.unit | Lincoln University | |
lu.contributor.unit | Lincoln Agritech | |
lu.identifier.orcid | 0000-0002-0421-8491 | |
pubs.issue | 2 | |
pubs.publication-status | Published | |
pubs.publisher-url | http://dx.doi.org/10.4271/2017-01-0523 | |
pubs.volume | 10 |