Multiphase ignition and combustion model and its characteristics of boron particles based on dynamic experimental phenomena

IF 5.8 2区 工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-05-04 DOI:10.1016/j.combustflame.2024.113445
Xianju Wu , Zhijun Wei
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Abstract

Boron, renowned for its high-energy potential but challenged by combustion difficulties, emerges as an ideal fuel for solid-fuel scramjet engines. This study improved the ignition and combustion model for boron particles in wet air by refining the Penn State University extension models based on the dynamic experimental phenomena. Under atmospheric pressure, the transition in combustion mode for boron particles occurs within the diameter range of 3.5–4.9 µm, with increased ambient temperature or H2O concentration promoting the shift towards diffusion-controlled mode. Larger particles exhibit a sequential combustion mode, transitioning from kinetics-controlled to diffusion-controlled, and back to kinetics-controlled, while smaller particles consistently remain kinetics-controlled. The ignition delay proportion increases with the particle diameter but generally stays below 10 %. Increasing the temperature significantly shortens the ignition time, while increasing the pressure significantly shortens the combustion time. Taking the combustion of 1 µm boron particles at atmospheric pressure as an example, as the temperature increases from 1700 K to 3500 K, the ignition time decreases to 0.08 %, and as the pressure increases from 0.5 atm to 15 atm, the combustion time decreases to 1.6 %. Increasing the O2 concentration significantly shortens the combustion time, with a lesser effect on the ignition time. The addition of H2O can reduce both ignition and combustion times, especially for boron particles with an approximate diameter of 5 µm in low temperature environments. However, once XH2O exceeds 15 %, the combustion time stabilizes in both combustion modes. Lower ambient temperatures and smaller particles enhance the impact of solidification on the combustion of boron particles.

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基于动态实验现象的硼颗粒多相点火和燃烧模型及其特征
硼因其高能潜力而闻名,但却面临燃烧困难的挑战,因此成为固体燃料喷气发动机的理想燃料。本研究根据动态实验现象完善了宾夕法尼亚州立大学的扩展模型,改进了硼粒子在湿空气中的点火和燃烧模型。在大气压力下,硼粒子的燃烧模式在直径 3.5-4.9 微米范围内发生转变,环境温度或 H2O 浓度的增加会促进向扩散控制模式转变。较大的颗粒表现出顺序燃烧模式,从动力学控制模式过渡到扩散控制模式,然后又回到动力学控制模式,而较小的颗粒则始终保持动力学控制模式。点火延迟比例随颗粒直径增大而增大,但一般保持在 10% 以下。温度升高会大大缩短点火时间,而压力升高则会大大缩短燃烧时间。以 1 µm 硼粒子在大气压力下的燃烧为例,当温度从 1700 K 升至 3500 K 时,点火时间缩短至 0.08 %;当压力从 0.5 atm 升至 15 atm 时,燃烧时间缩短至 1.6 %。增加氧气浓度会大大缩短燃烧时间,但对点火时间的影响较小。加入 H2O 可以缩短点火和燃烧时间,尤其是在低温环境中直径约为 5 µm 的硼颗粒。然而,一旦 XH2O 超过 15%,两种燃烧模式下的燃烧时间都会趋于稳定。较低的环境温度和较小的颗粒会增强凝固对硼颗粒燃烧的影响。
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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.
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