CAJ | 학술논문

针对相对静止气氛下单颗粒硼的着火过程展开了系统研究，考虑硼颗粒周围径向气相流动以及硼颗粒与周围环境间的传热和传质过程，建立了一维硼颗粒着火模型。分析了硼颗粒在实现着火和未能实现着火两种典型情形下的颗粒相、气相组分参数以及颗粒外表面上 Stefan 流的变化规律，并对其成因展开了分析。研究表明，在实现着火和未能实现着火两种典型情形下，硼颗粒外表面的 Stefan 流都会经历先由周围空间流向颗粒表面，而后变为由颗粒表面流向周围空间的过程；考虑颗粒外表面处气相 Stefan 流作用后，硼颗粒的着火延迟时间减少，且压力越大，影响越大。
침대상대정지기분하단과립붕적착화과정전개료계통연구，고필붕과립주위경향기상류동이급붕과립여주위배경간적전열화전질과정，건립료일유붕과립착화모형。분석료붕과립재실현착화화미능실현착화량충전형정형하적과립상、기상조분삼수이급과립외표면상 Stefan 류적변화규률，병대기성인전개료분석。연구표명，재실현착화화미능실현착화량충전형정형하，붕과립외표면적 Stefan 류도회경력선유주위공간류향과립표면，이후변위유과립표면류향주위공간적과정；고필과립외표면처기상 Stefan 류작용후，붕과립적착화연지시간감소，차압력월대，영향월대。
The ignition process of boron particles in relatively static atmosphere was studied systemically.In view of the gas flow around the boron particle,the heat and mass transfer process between the boron particle and the surroundings,a one dimensional ignition model of boron particles was proposed.The changing regularities of important parameters of the gas and the particle in the two typical cases,namely,the successful ignition case and the degenerate ignition case were studied.And the mechanisms for them were analyzed in detail.The result shows that Stefan flow in both typical cases will undergo changing flow direction.Stefan flow undergoes flowing to the particle surface from the gas,and then it flows to the gas from the particle surface.Study of ignition process of boron particles in the paper shows that ignition time decrease with consideration of Stefan flow at the particle surface.And the effect increases with the ambient pressure.