Three-dimensional simulations of NEPE propellant combustion under depressurization effects

IF 5.8 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-10-07 DOI:10.1016/j.combustflame.2024.113785

Kaixuan Chen , Zhenwei Ye , Yizhe Yu , Xiaochun Xue , Yonggang Yu

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Abstract

This study aims to analyze the characteristics of micro-combustion and unsteady flame development in nitrate ester-plasticized polyether (NEPE) propellant when exposed to rapid pressure decay. A three-dimensional NEPE propellant combustion model is firstly established to achieve this goal. The framework consists of two parts. Firstly, we used sequential algorithms to generate a 3D numerical pack satisfying industrial requirements. In the numerically generated propellant pack, Ammonium perchlorate (AP) particles, and Cyclotetramethylene tetranitramine (HMX) particles are assumed as spheres, whereas the void space is Nitroglycerin/1,2,4-Butane triol trinitrate (NG/BTTN) binder. Secondly, a new kinetic model considering the pyrolysis of condensed phase and complicated interaction of gas species in the gas phase is proposed, which has been not reported until now. The accuracy of this framework is verified via comparing with experimental results. Upon simulating the depressurization combustion of NEPE propellant, it is observed that the non-planar surface stimulates the growth of Leading-Edge Flames, leading to intensified burning during the initial stage of depressurization combustion. After 5.2 ms of depressurization combustion, a remarkable increase in bulk heat release in the gas phase is discovered, attributed to the involvement of coarse AP particles, thereby providing a conducive oxidizing burning environment. Examination of the propellant surface temperature reveals that the oxidizer/binder interface exhibits higher temperatures (∼950 K) at 3.4 MPa, while the particle core typically remains cooler (∼850 K) at pressures ranging from 1.0 to 3.5 MPa. The dynamic temperature fluctuations are a result of the heterogeneity of the propellant microstructure, which also serves as the primary cause of oscillations in several globally averaged parameters. The flickering flame behavior during transient combustion, along with the corresponding combustion characteristics, offers theoretical insights for the study of combustion instability in solid rocket motors, warranting further validation through experimental cases.

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减压效应下 NEPE 推进剂燃烧的三维模拟

本研究旨在分析硝酸酯塑化聚醚（NEPE）推进剂在受到快速压力衰减时的微燃烧和非稳态火焰发展特征。为实现这一目标，首先建立了一个三维 NEPE 推进剂燃烧模型。该框架由两部分组成。首先，我们使用顺序算法生成满足工业要求的三维数值包。在数值生成的推进剂包中，高氯酸铵（AP）颗粒和环四亚甲基四硝胺（HMX）颗粒被假定为球体，而空隙则是硝化甘油/1,2,4-丁烷三醇三硝酸酯（NG/BTTN）粘合剂。其次，考虑到凝聚相的热解和气相中气体物种的复杂相互作用，提出了一种新的动力学模型，这是迄今为止尚未报道过的。通过与实验结果比较，验证了这一框架的准确性。在模拟 NEPE 推进剂的减压燃烧时，观察到非平面表面刺激了前缘火焰的生长，导致减压燃烧初始阶段燃烧加剧。经过 5.2 毫秒的减压燃烧后，发现气相中的散热量显著增加，这归因于粗 AP 粒子的参与，从而提供了一个有利的氧化燃烧环境。对推进剂表面温度的研究表明，在 3.4 兆帕压力下，氧化剂/粘合剂界面的温度较高（∼950 K），而在 1.0 至 3.5 兆帕压力下，颗粒核心的温度通常较低（∼850 K）。动态温度波动是推进剂微观结构的异质性造成的，这也是几个全局平均参数发生振荡的主要原因。瞬态燃烧过程中的火焰闪烁行为以及相应的燃烧特征，为固体火箭发动机燃烧不稳定性的研究提供了理论启示，值得通过实验案例进一步验证。

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来源期刊

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.