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首页> 外文期刊>Journal of thermal analysis and calorimetry >Effect of gas generator pressure on the physicochemical, oxidation and combustion characteristics of boron-based propellant primary combustion products
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Effect of gas generator pressure on the physicochemical, oxidation and combustion characteristics of boron-based propellant primary combustion products

机译：气体发生器压力对硼基推进剂初级燃烧产物物理化学，氧化和燃烧特性的影响

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摘要

To clarify the effect of gas generator pressure on the physicochemical, oxidation and combustion characteristics of the condensed primary combustion products of boron-based propellants, the elemental, composition and morphology of the primary combustion products collected under chamber pressure of 0.2-8 MPa were investigated by energy-dispersive (EDS), X-ray photoelectron spectroscopy and scanning electron microscopy with energy-dispersive (SEM-EDS) individually. The oxidation, ignition and combustion behaviors of these products were further studied by laser ignition system and thermogravimetry-differential scanning calorimetry. We found out that high-pressure condition lowered the content of elementary boron and elementary carbon while raised the content of boron carbide. Numerous spherical carbon particles with a diameter around 100 nm were observed in the products. Boron lumps were partially or almost fully covered with carbon particles on the surface. The reaction mechanisms of thermal oxidation of primary combustion products were given. The onset temperature of boron in the products kept at 500 A degrees C when pressure ranged from 3 to 8 MPa but increased to 583 A degrees C at 0.2 MPa. As the pressure increased from 0.2 to 8 MPa, the emission spectrum intensity of both boron and carbon got enhanced by 25%, and the ignition delay of boron was significantly shortened by 515 ms. In conclusion, high gas generator pressure is favorable to the secondary ignition and combustion of primary combustion products.
机译：为了阐明气体发生器压力对硼基推进剂的浓缩初级燃烧产物的物理化学，氧化和燃烧特性，研究了在0.2-8MPa的腔室压力下收集的初级燃烧产物的元素，组成和形态通过能量分散（EDS），X射线光电子体光谱和扫描电子显微镜，单独具有能量分散（SEM-EDS）。通过激光点火系统和热重分析扫描量热法进一步研究这些产品的氧化，点火和燃烧行为。我们发现高压条件降低了基本硼和基本碳的含量，同时提高了碳化硼的含量。在产品中观察到直径约为100nm的许多球形碳颗粒。硼肿块部分或几乎完全覆盖在表面上的碳颗粒。给出了初级燃烧产物的热氧化反应机制。当压力范围为3至8MPa但在0.2MPa的压力下，产物中硼的起始温度保持在500℃，但在0.2MPa下增加至583℃。随着压力从0.2〜8MPa增加，硼和碳的发射光谱强度增强了25％，硼的点火延迟明显缩短了515毫秒。总之，高气体发生器压力有利于初级燃烧产物的二次点火和燃烧。

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