【摘要】：為了研究相關(guān)因素對硼顆粒點火過程的影響規(guī)律,基于多層氧化層結(jié)構(gòu),改進了硼顆粒的點火模型。該模型考慮了顆粒氧化層表面物質(zhì)成分的變化、表面火焰面形成的物理過程,模型計算結(jié)果與實驗數(shù)據(jù)具有較高的吻合度。應用該模型研究了環(huán)境壓強、顆粒直徑、氣相氧化劑濃度以及環(huán)境溫度對硼顆粒點火過程的影響規(guī)律。結(jié)果表明,環(huán)境壓力越大,顆粒點火時間越短;顆粒粒徑越大,顆粒表面氧化層越厚,從而延長了顆粒的點火時間;在較大顆粒直徑(5μm)下增加環(huán)境內(nèi)氧氣濃度有利于顆粒點火,對小顆粒直徑(≤5μm)則無明顯影響;水蒸氣濃度越大,顆粒點火時間越短;環(huán)境溫度越高,越有利于顆粒點火。
[Abstract]:In order to study the influence of related factors on the ignition process of boron particles, the ignition model of boron particles was improved on the basis of multi-layer oxide structure. The model takes into account the physical process of the formation of flame surface and the change of material composition on the surface of the particle oxide layer. The calculated results of the model are in good agreement with the experimental data. The effects of ambient pressure, particle diameter, gas-phase oxidant concentration and ambient temperature on the ignition process of boron particles were studied by using the model. The results show that the larger the ambient pressure is, the shorter the ignition time is, the larger the particle size is, the thicker the oxide layer on the surface of the particle is, thus prolonging the ignition time of the particle. Increasing oxygen concentration in the environment at larger particle diameter (5 渭 m) is beneficial to particle ignition, but has no obvious effect on small particle diameter (鈮，

本文編號：2471391