CAJ | 학술논문

研究了燃烧器喷管的材料及尺寸、针形电场和水平磁场等因素对乙醇小尺度扩散火焰稳燃极限的影响.结果表明：不同内径的陶瓷喷管，当内径从0.4,mm增大到1.0,mm，其燃烧下限由0.6,mL/h减小到0.5,mL/h，燃烧上限由1.05,mL/h 增大到1.6,mL/h ，内径相同的燃烧器喷管，不锈钢管燃烧上限为1.85,mL/h ，石英玻璃管的为1.65,mL/h，即采用内径较大，材料导热系数较大的燃烧器喷管，火焰的稳燃范围较宽；45°针形电场作用下，当电极距为4,cm，电压大于5,kV 时，针形电场产生的离子风能吹熄低流量时的火焰，此时火焰的燃烧下限急剧增大，直到增大到与火焰燃烧上限相同时，火焰没有稳燃区间；水平磁场作用下，当磁场强度从0 mT增大到52.5,mT，磁场中乙醇的扩散系数随之增大，进而增大了乙醇的燃烧速度，火焰的燃烧上限也随之增大.
연구료연소기분관적재료급척촌、침형전장화수평자장등인소대을순소척도확산화염은연겁한적영향.결과표명：불동내경적도자분관，당내경종0.4,mm증대도1.0,mm，기연소하한유0.6,mL/h감소도0.5,mL/h，연소상한유1.05,mL/h 증대도1.6,mL/h ，내경상동적연소기분관，불수강관연소상한위1.85,mL/h ，석영파리관적위1.65,mL/h，즉채용내경교대，재료도열계수교대적연소기분관，화염적은연범위교관；45°침형전장작용하，당전겁거위4,cm，전압대우5,kV 시，침형전장산생적리자풍능취식저류량시적화염，차시화염적연소하한급극증대，직도증대도여화염연소상한상동시，화염몰유은연구간；수평자장작용하，당자장강도종0 mT증대도52.5,mT，자장중을순적확산계수수지증대，진이증대료을순적연소속도，화염적연소상한야수지증대.
How these factors including burner nozzle,needle-shaped electric field and horizontal magnetic field influence small diffusion flame stability limits was studied experimentally using liquid ethanol as fuel. The results show that as the inner diameter of the ceramic nozzle increases from 0.4,mm to 1.0,mm,its lower flame stability limit decreases from 0.6,mL/h to 0.5,mL/h while its upper flame stability limit increases from 1.05,mL/h to 1.6,mL/h. When the burner of the same inner diameter is used,the upper flame stability limit of stainless steel tube is 1.85,mL/h,and that of quartz glass tube is 1.65,mL/h,which indicates that the larger the inner diameter is and the higher the thermal conductivity of burner nozzle is,the wider the range of stationary combustion flame will be. Under the influenceof 45° needle-shaped electric field,when the electrode distance is 4,cm and the voltage is greater than 5,kV,the needle electric field produced by the ion wind will blow out the low flow of flame,and the flame has no stable combustion interval. Under the action of horizontal magnetic field,as the magnetic field strength increases from 0,mT to 52.5,mT,the diffusion coefficient of the ethanol in the magnetic field increase,thus increasing the flame burning velocity of ethanol and its upper flame stability limit.