露天 NEPE 固体推进剂火焰特性研究:通过 CFD 研究高度对火焰性能的影响

Li Yu, Guangmei Shi, Yupeng Hu, Minghai Li, Yuan Ma, Yanhong Zhang
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引用次数: 0

摘要

当两个固体推进剂火源靠近时,它们的燃烧特性可能相互作用,导致双火源固体推进剂火灾的现象。本研究旨在综合评价两种NEPE(硝酸酯塑化醚)固体推进剂在露天环境下的燃烧行为。实验结果表明,双火源固体推进剂的燃烧动力学受推进剂粒径、源间间距和环境风条件等因素的影响显著。在燃烧过程中观察到各种独特的现象,包括火焰独立发展,火焰融合和间歇性独立火焰衰减。这些现象导致火焰温度的显著波动,双火源之间的温度比单火源之间的温度低。此外,建立了一个三维燃烧-流动耦合计算模型,整合了随机粒子轨迹、涡旋耗散和辐射模型。数值模拟有效地复制了观测结果,表明环境风速的增加增强了两种推进剂火焰之间的遮挡行为,导致火焰高度降低,火焰辐射强度减弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental and numerical investigation on combustion characteristics of double large cube RDX-based NEPE solid propellant burning in an atmospheric environment

Experimental and numerical investigation on combustion characteristics of double large cube RDX-based NEPE solid propellant burning in an atmospheric environment
When two solid propellant fire sources are in close proximity, their combustion characteristics may interact, leading to the phenomenon known as dual-fire source solid propellant fire. This study aims to comprehensively evaluate the combustion behavior of two NEPE (Nitrate Ester Plasticized Ether) solid propellant fires in an open-air environment. Experimental findings indicate that the combustion dynamics of dual-fire source solid propellants are significantly influenced by factors such as propellant size, inter-source spacing, and environmental wind conditions. Various distinctive phenomena were observed during the combustion process, including independent flame development, flame fusion, and intermittent independent flame decay. These phenomena resulted in notable fluctuations in flame temperature, with temperatures between dual-fire sources being lower compared to their single-fire source counterparts. Additionally, a three-dimensional combustion-flow coupling computational model was developed, integrating models for random particle trajectories, vortex dissipation, and radiation. The numerical simulations effectively replicated the observed effects, showing that increasing environmental wind speed enhances the occlusion behavior between the two propellant flames, leading to reduced flame height and diminished flame radiation intensity.
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