Combustion process of agglomerated boron particles at 0.1—1.0 MPa atmospheric pressure
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摘要:
为明晰加压环境下团聚硼颗粒燃烧特性，采用激光点火试验系统，探究了粒径约为350 μm的团聚硼在0.1～1.0 MPa 环境范围内的点火燃烧过程。试验结果表明：在激光开始加热的15 ms以内，压强越高的环境中，BO2的发射峰更明显，且颗粒表面温度更高。但在激光开始加热的15 ms之后，高压环境中，硼燃烧会出现明显的产物凝结-聚集-沉降现象，具体为燃烧产物氧化硼凝结形成烟雾，聚集成较大颗粒并沉降覆盖在团聚硼的外表面，影响硼颗粒的能量释放过程，使颗粒表面温度降低。环境压强从0.2 MPa增加到1.0 MPa，平均自维持燃烧时间从191 ms增加到547 ms。本研究有利于深入认识团聚硼颗粒在加压环境中的能量释放过程，研究结果对优化含硼推进剂的配方设计和优化含硼冲压发动机的燃烧组织具有实际意义。
Abstract:In order to elucidate the combustion characteristics of agglomerated boron particles in a pressurized environment, a laser ignition experimental system was employed to investigate the ignition and combustion process of agglomerated boron particles with an average particle size of approximately 350 μm within the pressure range of 0.1—1.0 MPa. The experimental findings demonstrated that within 15 ms of laser heating, there was a more pronounced emission peak for BO2 and higher particle surface temperatures in environments with elevated pressures. However, after 15 ms from initiating laser heating in high-pressure environments, smoke generated by boron oxide covered the outer surface of aggregated boron particles, thereby influencing their energy release process and reducing their surface temperatures. As ambient pressure increased from 0.2 MPa to 1.0 MPa, the average self-sustaining combustion time also increased from 191 ms to 547 ms. This contributed to understanding of the energy release process of boron particles in pressurized environments, so it showed practical significance for optimizing formula design for propellants containing boron and enhancing the combustion structure for ramjets utilizing boron.
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图 1 放置在钨片上用于激光点火的团聚硼颗粒及扫描电镜图像
Figure 1. Agglomerated boron particle placed on a tungsten plate for laser ignition and its scanning electron microscope images
图 3 团聚硼在不同压强环境中表面形貌变化过程
Figure 3. Surface morphology changes of agglomerated boron in different pressure environments
图 4 团聚硼在不同压强环境中的燃烧过程
Figure 4. Combustion process of agglomerated boron in different pressure environments
图 5 环境中的 B2O3液滴向母颗粒上表面扩散并最终融于母颗粒的过程
Figure 5. Process of B2O3 droplets in the environment diffuse to the upper surface of the parent particle and finally melt into the parent particle
图 6 不同压强环境中最大光谱强度时刻的光谱强度-波长曲线
Figure 6. Spectral intensity-wavelength curves at the time of maximum spectral intensity in different pressure environments
图 7 不同压强环境中的自维持燃烧时间
Figure 7. Self-sustaining combustion time in different pressure environments
图 8 不同压强下的颗粒温度变化曲线
Figure 8. Temperature curves of particles under different pressures
图 9 凝相颗粒表面的扫描电镜图像
Figure 9. Scanning electron microscope images of condensed particle surface
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