Characterization of the burning behavior of Ultra porous polyurethane-based aerogel: Impact of material properties on burning behavior

IF 5.8 2区 工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-11-29 DOI:10.1016/j.combustflame.2024.113859
Yan Ding , Xinyang Wang , Grayson Bellamy , Mark McKinnon , Yu Wang
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Abstract

This work details a hierarchical methodology to develop a pyrolysis model for ultra porous energy-efficient polyurethane-based aerogel (PU-aerogel). This methodology relied on simultaneous measurements of sample mass, back surface temperature (Tback), as well as sample shape profiles collected from controlled atmosphere pyrolysis apparatus (CAPA II) experiments. Based on the measured radiation-optical properties and the developed reaction mechanism, the thermal transport properties were determined based on the inverse modeling of these measurements. The resulting pyrolysis model was able to reproduce the sample shape profiles and Tback with an average accuracy of 10.5 % and 6.2 %, respectively. The model also predicted the burning rates of PU-aerogel at both radiative heat fluxes. An additional sensitivity analysis was conducted to systematically investigate the impact of input parameters on the burning behavior of PU-aerogel. The average MLR (avgMLR) and time to Tback = 533K (t533K) of the CAPA II experiment under 60 kW m−2 were defined as the model outputs. The density of the virgin material showed the most significant impact on changing avgMLR (-27.4 %) and t533K (108.7 %), followed by the density and thermal conductivity of intermediate components. The variations in material properties yielded a negligible effect on the time to peak MLR because the peak MLR of this specific material occurred very rapidly upon exposure. The findings of this work enabled the prediction of burning behavior of PU-aerogel and the design of a more flame-resistant PU-aerogel.
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超多孔聚氨酯气凝胶燃烧性能的表征:材料性能对燃烧性能的影响
这项工作详细介绍了一种分层方法来开发超多孔节能聚氨酯气凝胶(pu -气凝胶)的热解模型。该方法依赖于同时测量样品质量、后表面温度(Tback)以及从可控气氛热解装置(CAPA II)实验中收集的样品形状曲线。根据所测得的辐射光学性质和所建立的反应机理,通过对这些测量结果的逆建模,确定了热输运性质。所建立的热解模型能够再现样品的形状曲线和Tback,平均精度分别为10.5%和6.2%。该模型还预测了pu气凝胶在两种辐射热流下的燃烧速率。另外进行了灵敏度分析,系统地研究了输入参数对pu气凝胶燃烧行为的影响。将CAPA II实验在60 kW m−2条件下的平均MLR (avgMLR)和转回时间= 533K (t533K)定义为模型输出。原始材料的密度对avgMLR(- 27.4%)和t533K(108.7%)的影响最为显著,其次是中间组分的密度和导热系数。材料特性的变化对MLR峰值时间的影响可以忽略不计,因为这种特定材料的MLR峰值在暴露后非常迅速地出现。这项工作的发现使得预测pu气凝胶的燃烧行为和设计更阻燃的pu气凝胶成为可能。
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来源期刊
Combustion and Flame
Combustion and Flame 工程技术-工程:化工
CiteScore
9.50
自引率
20.50%
发文量
631
审稿时长
3.8 months
期刊介绍: The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.
期刊最新文献
Thermodiffusively-unstable lean premixed hydrogen flames: Length scale effects and turbulent burning regimes Characterization of the burning behavior of Ultra porous polyurethane-based aerogel: Impact of material properties on burning behavior A detailed analysis of the key steps of the cyclopentene autoignition mechanism from calculated RRKM rate constants associated with ignition delay time simulations A detailed kinetic submechanism for OH* chemiluminescence in hydrocarbon combustion Kinetic study of the growth of PAHs from biphenyl with the assistance of phenylacetylene
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