Effects of C2H2 and C2H4 radiation on soot formation in ethylene/air diffusion flames

Zheng, Sining; Yang, Yu; Sui, Ran; Lü, Qiang

doi:10.1016/j.applthermaleng.2020.116194

Cited by 24 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Radiative Effect of Acetylene Addition. The radiative effect 45,46 of acetylene addition to the fuel was "frozen" via the use of the fictitious on-radiating FC 2 H 2 in Case 7 for comparison with Case 5 (of radiating FC 2 H 2 ). In both cases, the chemical effects of C 2 H 2 were excluded.…”

Section: Chemical Effect Of Acetylene Additionmentioning

confidence: 99%

Effects of Acetylene Addition to the Fuel Stream on Soot Formation and Flame Properties in an Axisymmetric Laminar Coflow Ethylene/Air Diffusion Flame

et al. 2021

Self Cite

View full text Add to dashboard Cite

The effects of adding acetylene to the fuel stream on soot formation and flame properties were investigated numerically in a laminar axisymmetric coflow ethylene/air diffusion flame using the open-source flame code Co-Flame in conjunction with an elementary gas-phase chemistry scheme and detailed transport and thermodynamic database. Radiation heat transfer of the radiating gases (H 2 O, C 2 H 2 , CO, and CO 2 ) and soot was calculated using a statistical narrow-band correlated- k -based wide band model coupled with the discrete-ordinates method. The soot formation was described by the consecutive steps of soot nucleation, surface growth of soot particles via polycyclic aromatic hydrocarbons (PAHs)-soot condensation or the hydrogen abstraction acetylene addition (HACA) mechanism, and soot oxidation. The added acetylene affected the flame structure and soot concentration through not only chemical reactions among different species but also radiation effects. The chemical effect due to the added acetylene had a significant impact on soot formation. Specifically, it was confirmed that the addition of 10% acetylene caused an increase in the peak soot volumetric fraction (SVF) by 14.9% and the peak particle number density by about 21.1% ( z = 1.5 cm). Furthermore, increasing acetylene concentration led to higher concentrations of propargyl, benzene, and PAHs and consequently directly enhanced soot nucleation rates. In addition, the increased H mole fractions also accentuated the soot surface growth. In contrast, the radiation effect of the addition of 10% acetylene was much weaker, resulting in slightly lower flame temperature and SVF, which in turn reduced the radiant heat loss.

show abstract

Section: Chemical Effect Of Acetylene Additionmentioning

confidence: 99%

Effects of Acetylene Addition to the Fuel Stream on Soot Formation and Flame Properties in an Axisymmetric Laminar Coflow Ethylene/Air Diffusion Flame

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Naseri et al [23] concluded that chemical effect of CO 2 limited the PAHs formation through limiting the formation C 2 H 2 and C 6 H 6 , which are building blocks of PAHs. In addition to the chemical and dilutive effects, the radiative effect can not be ignored [21,22]. Liu et al [23] reported that the radiative effect of H 2 O lowered the temperature in the centerline region by 12 K. Considering the Plank mean absorption coefficients of CO 2 at temperatures above 500 K were larger than those of H 2 O [24], it is necessary to explore the radiative effect of CO 2 on the soot formation in the aviation kerosene combustion.…”

Section: Introductionmentioning

confidence: 99%

Chemical, radiative, and dilutive effects of CO2 addition on soot formation in jet A-1 kerosene co-flow diffusion flame

et al. 2023

Self Cite

View full text Add to dashboard Cite

With the development of aviation industry, it is urgently to investigate the soot formation properties of aviation kerosene to better control the soot emissions. The dilutive, chemical and radiative effects of CO2on the soot inception, condensation and HACA growth processes in laminar co-flow Jet-A1 kerosene diffusion flames were numerically investigated by employing detailed chemical mechanisms and soot sectional models. The results showed that the addition of CO2dramatically decreased the maximum temperature (by 92 K)and soot volume fraction (by 41.0%). The dilutive effect of CO2 contributed the most to the decrease of temperature and soot volume fraction. It also was the main factor in the decrease of soot inception, condensation and HACA growth processes. The chemical effect of CO2had little impact on the decomposition of fuels into light hydrocarbons, but obviously limited the growth of light hydrocarbons to A1. The radiative effect of CO2decreased the maximum temperature and soot volume fraction by 13 K and 5.2% (from 1.92 to 1.82 ppm). It had little impact on the soot inception, condensation and HACA growth rates.

show abstract

“…Gas radiative heat transfer plays a key role in combustion systems such as industrial furnaces, boilers, gas turbine combustion chambers, as well as small-scale flames. [8][9][10][11][12] Different from the radiative transfer characteristics of surfaces and particles that do not vary with wavelength radically as gases, the radiative properties of gases change rapidly in the whole spectrum. [13] Recently, with the development in aerospace, atmospheric interceptor and infrared detection, [14] infrared gas thermal radiation characteristics and transmission mechanism has been paid wide attention.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Applications of Non-gray Gas Radiation Models in Multi-dimensional Systems

Zheng¹,

Sui²,

Sun³

et al. 2021

ES Energy Environ.

Self Cite

View full text Add to dashboard Cite

Keeping gas radiation is a major way of heat transfer in flames. It affects temperature distributions and hence causes energy transfer in the combustion gaseous as well as subsequent chemical reactions. Accurate and efficient modeling of radiative heat transfer in multi-dimensional combustion systems is challenging, due to the drastic and rapid change of the radiative properties of the reacting gases in the whole spectrum, and the extensive computational cost for solving the radiative transfer equation (RTE) in multi-dimensional space. Several gas radiation models and RTE solution methods have been proposed to treat non-gray radiation heat transfer in combustion systems. In this paper, we first review the development of spectral line databases, gas radiation models and RTE solution methods. Subsequently, the development of radiation model parameters for different gaseous species is discussed. Next, recent simulation investigations are reviewed for one-dimensional, twodimensional and three-dimensional systems involving these state-of-the-art radiation models. In addition, we also discuss machine learning approaches for establishing gas radiation models and solving RTEs in non-gray gas radiative problems, an alternative and flexible way to deal with the complex and dynamic systems. Hopefully, this review will provide an up-to-date knowledge about the numerical calculations of gas radiation heat transfers in combustion systems.

show abstract

Effects of C2H2 and C2H4 radiation on soot formation in ethylene/air diffusion flames

Cited by 24 publications

References 37 publications

Effects of Acetylene Addition to the Fuel Stream on Soot Formation and Flame Properties in an Axisymmetric Laminar Coflow Ethylene/Air Diffusion Flame

Effects of Acetylene Addition to the Fuel Stream on Soot Formation and Flame Properties in an Axisymmetric Laminar Coflow Ethylene/Air Diffusion Flame

Chemical, radiative, and dilutive effects of CO2 addition on soot formation in jet A-1 kerosene co-flow diffusion flame

A Review on the Applications of Non-gray Gas Radiation Models in Multi-dimensional Systems

Contact Info

Product

Resources

About