Soot size distribution in lightly sooting premixed flames of benzene and toluene

doi:10.1007/s11708-020-0663-6

Front. Energy

2020, Vol. 14

Issue (1) : 18-26 https://doi.org/10.1007/s11708-020-0663-6

RESEARCH ARTICLE

Soot size distribution in lightly sooting premixed flames of benzene and toluene

Wang LIU, Jiaqi ZHAI, Baiyang LIN, He LIN, Dong HAN(

)

Key Laboratory for Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

The evolution of particle size distribution function (PSDF) of soot in premixed flames of benzene and toluene was studied on a burner stabilized stagnation (BSS) flame platform. The cold gas velocities were changed to hold the maximum flame temperatures of different flames approximately constant. The PSDFs of all the test flames exhibited a bimodal distribution, i.e., a small-size nucleation mode and a large-size accumulation mode. It was observed that soot nucleation and particle growth in the benzene flame were stronger than those in the toluene flame at short residence times. At longer residence times, the PSDFs of the two flames were similar, and the toluene flame showed a larger particle size distribution range and a higher particle volume fraction than the benzene flame.

Keywords premixed flame soot particle size distribution function benzene toluene

Corresponding Author(s): Dong HAN

Online First Date: 20 January 2020 Issue Date: 16 March 2020

Cite this article:

Wang LIU,Jiaqi ZHAI,Baiyang LIN, et al. Soot size distribution in lightly sooting premixed flames of benzene and toluene[J]. Front. Energy, 2020, 14(1): 18-26.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-020-0663-6
https://academic.hep.com.cn/fie/EN/Y2020/V14/I1/18

Fig.1 Schematic of experimental setup.

Flame	Mole fraction			Cold gas velocity $v 0 / (c m ? s − 1) a$	Maximum temperature T_m/K^b	Stagnation surface temperature T/K^b	$φ$	C/O ratio
Flame	Fuel	O₂	N₂	Cold gas velocity $v 0 / (c m ? s − 1) a$	Maximum temperature T_m/K^b	Stagnation surface temperature T/K^b	$φ$	C/O ratio
Benzene(B)	0.0757	0.3243	0.6000	4.4	1872±86	406	1.75	0.70
Toluene (T)	0.0651	0.3349	0.6000	3.6	1875±87	393	1.75	0.68

Tab.1 Test flame conditions

Fig.2 Measured (symbols) and computed (lines) centerline temperature profiles for the two flames.

Tab.2 Burner-to-stagnation separations and the corresponding particle residence times

Fig.3 Temperature-time histories calculated at two particle residence times.

Fig.4 Measured PSDFs for the two flames (a) The benzene flame; (b) the toluence flame. (Symbols: experimental data; lines: bi-lognormal fits to data).

Fig.5 Measured PSDFs for the two flames at different particle residence times (Symbols: experimental data; lines: bi-lognormal fitting data).

Fig.6 Number density versus particle residence time (Symbols: experimental data; lines: drawn to guide the eye).

Fig.7 Median mobility diameter of the particles in the accumulation mode versus particle residence time (Symbols: experimental data; lines: drawn to guide the eye).

Fig.8 Particle volume fraction versus particle residence time (Symbols: experimental data; lines: drawn to guide the eye).

Fig.9 Calculated mole fraction profiles of (a) acetylene and (b) benzene for the benzene and toluene flames at 1.0 cm.

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