Tailored mixture properties for accurate laminar flame speed measurement from spherically expanding flames: Application to H_2 /O_2 /N_2 /He mixtures

Yakun Zhang; Marine Jeanson; Rémy MévelZheng ChenNabiha Chaumeix

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Tailored mixture properties for accurate laminar flame speed measurement from spherically expanding flames: Application to H_2 /O_2 /N_2 /He mixtures

机译：Tailored mixture properties for accurate laminar flame speed measurement from spherically expanding flames: Application to H_2 /O_2 /N_2 /He mixtures

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The uncertainty on the laminar flame speed extracted from spherically expanding flames can be minimizedby using large flame radius data for the extrapolation to zero stretch-rate. However, at large radii,the hydrodynamic and thermo-diffusive instabilities would induce the wrinkling of the flame surface andlimit the range of usable data. In the present study, we have employed the flame stability theory ofMatalon to tailor the properties of the initial mixture so that onset of cellular flame would occur ata pre-determined, large radius. This approach was employed to measure the laminar flame speeds ofH 2 /O 2 /N 2 /He mixtures with equivalence ratios from 0.6 to 2.0, at pressures of 50/80/100 kPa and initialtemperature of 300 K. For most experiments we performed, the uncertainty related to the extrapolationto zero stretch-rate (performed with the linear curvature model) was below 2 as shown by the positionof the data points in the (L b /R f ,U , L b /R f ,L ) plan, where L b is the burned Markstein length; and R f ,Land R f ,U are the flame radii at the lower and upper bounds of the extrapolation range. Unsteady 1-Dsimulations using four chemical mechanisms were performed to show that unstretched laminar flamespeed can be well-characterized with relative error below 10 for most conditions. The flame dynamicalresponse to stretch rate could be captured by the mechanisms only under some conditions. Further analyseson critical flame radius were carried out: (ⅰ) the dominant parameters were identified based on alocal sensitivity analysis; and (ⅱ) the uncertainty on the predicted critical radius was determined throughan uncertainty propagation approach. Uncertainty in critical flame radius calculation comes mostly fromthe uncertainty on fundamental transport and kinetic data. The present work indicates that althoughthe stability theory of Matalon provides a well defined framework to tailor the mixture properties forimproved flame speed measurement, the inaccuracy of some of the required parameters can result insignificantly over-estimated critical radius for cellular flame onset which compromises the accuracy ofthe tailoring procedure.

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来源
《Combustion and Flame》 |2021年第9期|111487.1-111487.12|共12页
作者
Yakun Zhang; Marine Jeanson; Rémy MévelZheng ChenNabiha Chaumeix;
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作者单位

Center for Combustion Energy, School of Vehicle and Mobility, State Key Laboratory for Automotive Safety and Energy, Tsinghua University, Beijing, China;

CNRS-INSIS, I.C.A.R.E., 1C, Avenue de la recherche scientifique, 45071 Orléans cedex 2, France;

SKLTCS, CAPT, Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类
关键词
Spherical expanding flame; Critical flame radius; Laminar flame speed; Uncertainty propagation;

Tailored mixture properties for accurate laminar flame speed measurement from spherically expanding flames: Application to H_2 /O_2 /N_2 /He mixtures

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