Ignition delay measurements of light naphtha: A fully blended low octane fuel

Tamour Javed, Ehson Fawad Nasir, Ahfaz Ahmed, Jihad Badra, Khalil Djebbi, Mohamed Beshir, Weiqi Ji, Mani Sarathy, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Light naphtha is a fully blended, low-octane (RON. = 64.5, MON. = 63.5), highly paraffinic (>. 90% paraffinic content) fuel, and is one of the first distillates obtained during the crude oil refining process. Light naphtha is an attractive low-cost fuel candidate for advanced low-temperature compression ignition engines where autoignition is the primary control mechanism. We measured ignition delay times for light naphtha in a shock tube and a rapid compression machine (RCM) over a broad range of temperatures (640-1250. K), pressures (20 and 40. bar) and equivalence ratios (0.5, 1 and 2). Ignition delay times were modeled using a two-component primary reference fuel (PRF) surrogate and a multi-component surrogate. Both surrogates adequately captured the measured ignition delay times of light naphtha under shock tube conditions. However, for low-temperature RCM conditions, simulations with the multi-component surrogate showed better agreement with experimental data. These simulated surrogate trends were confirmed by measuring the ignition delay times of the PRF and multi-component surrogates in the RCM at . P = 20. bar, . ϕ = 2. Detailed kinetic analyses were undertaken to ascertain the dependence of the surrogates' reactivity on their chemical composition. To the best of our knowledge, this is the first fundamental autoignition study on the reactivity of a low-octane fully blended fuel and the use of a suitably formulated multi-component surrogate to model its behavior.
Original languageEnglish (US)
Pages (from-to)315-322
Number of pages8
JournalProceedings of the Combustion Institute
Volume36
Issue number1
DOIs
StatePublished - Jun 15 2016

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