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dc.contributor.authorJaved, Tamour
dc.contributor.authorBadra, J.
dc.contributor.authorJaasim, Mohammed
dc.contributor.authorEs-sebbar, Et-touhami
dc.contributor.authorLabastida, M.F.
dc.contributor.authorChung, Suk-Ho
dc.contributor.authorIm, Hong G.
dc.contributor.authorFarooq, Aamir
dc.date.accessioned2017-04-15T11:15:46Z
dc.date.available2017-04-15T11:15:46Z
dc.date.issued2016-12-29
dc.identifier.citationJaved T, Badra J, Jaasim M, Es-Sebbar E, Labastida MF, et al. (2016) Shock Tube Ignition Delay Data Affected by Localized Ignition Phenomena. Combustion Science and Technology 189: 1138–1161. Available: http://dx.doi.org/10.1080/00102202.2016.1272599.
dc.identifier.issn0010-2202
dc.identifier.issn1563-521X
dc.identifier.doi10.1080/00102202.2016.1272599
dc.identifier.urihttp://hdl.handle.net/10754/623236
dc.description.abstractShock tubes have conventionally been used for measuring high-temperature ignition delay times ~ O(1 ms). In the last decade or so, the operating regime of shock tubes has been extended to lower temperatures by accessing longer observation times. Such measurements may potentially be affected by some non-ideal phenomena. The purpose of this work is to measure long ignition delay times for fuels exhibiting negative temperature coefficient (NTC) and to assess the impact of shock tube non-idealities on ignition delay data. Ignition delay times of n-heptane and n-hexane were measured over the temperature range of 650 – 1250 K and pressures near 1.5 atm. Driver gas tailoring and long length of shock tube driver section were utilized to measure ignition delay times as long as 32 ms. Measured ignition delay times agree with chemical kinetic models at high (> 1100 K) and low (< 700 K) temperatures. In the intermediate temperature range (700 – 1100 K), however, significant discrepancies are observed between the measurements and homogeneous ignition delay simulations. It is postulated, based on experimental observations, that localized ignition kernels could affect the ignition delay times at the intermediate temperatures, which lead to compression (and heating) of the bulk gas and result in expediting the overall ignition event. The postulate is validated through simple representative computational fluid dynamic simulations of post-shock gas mixtures which exhibit ignition advancement via a hot spot. The results of the current work show that ignition delay times measured by shock tubes may be affected by non-ideal phenomena for certain conditions of temperature, pressure and fuel reactivity. Care must, therefore, be exercised in using such data for chemical kinetic model development and validation.
dc.description.sponsorshipWe would like to acknowledge the funding provided Saudi Aramco under the FUELCOM program and by King Abdullah University of Science and Technology (KAUST). We would like to thank Prof. Mani Sarathy (KAUST) for useful discussions on chemical kinetic mechanisms of n-alkanes.
dc.publisherInforma UK Limited
dc.relation.urlhttp://www.tandfonline.com/doi/full/10.1080/00102202.2016.1272599
dc.subjectShock tube
dc.subjectauto-ignition
dc.subjectn-heptane
dc.subjectpre-ignition
dc.subjectignition regimes
dc.titleShock Tube Ignition Delay Data Affected by Localized Ignition Phenomena
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.identifier.journalCombustion Science and Technology
dc.contributor.institutionFuel Technology Division, R&DC, Saudi Aramco, Dhahran, Saudi Arabia
dc.contributor.institutionPaul Scherrer Institute, Laboratory for Thermal Processes & Combustion, CH-5232 Villigen PSI, Switzerland
kaust.personJaved, Tamour
kaust.personJaasim, Mohammed
kaust.personEs-sebbar, Et-touhami
kaust.personLabastida, M.F.
kaust.personChung, Suk-Ho
kaust.personIm, Hong G.
kaust.personFarooq, Aamir


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