CAJ | 학술논문

烟点高度能有效表征燃料碳黑生成能力的大小，基于烟点高度的碳黑模型不仅可以得到非常可观的计算精度，且计算成本较低。本文分别采用 Beji、Yao 和 Lautenberger 等提出的碳黑模型对乙烯层流扩散火焰进行数值模拟，并对比分析了3种模型的碳黑浓度分布以及碳黑生成速率分布和实际测量值的差异。结果表明，Beji和Yao均采用了 Delichatsios 提出的碳黑生成模型，但 Beji 的混合分数取值范围更为合理；Yao 采用的碳黑表面化学反应模型，在略高于化学当量比的部分可能低估了碳黑的氧化速率；Lautenberger 根据碳黑生成速率分布图，假设了碳黑生成速率与混合分数和温度的关系，但在混合分数和温度的取值范围以及近似方法上有待改进。
연점고도능유효표정연료탄흑생성능력적대소，기우연점고도적탄흑모형불부가이득도비상가관적계산정도，차계산성본교저。본문분별채용 Beji、Yao 화 Lautenberger 등제출적탄흑모형대을희층류확산화염진행수치모의，병대비분석료3충모형적탄흑농도분포이급탄흑생성속솔분포화실제측량치적차이。결과표명，Beji화Yao균채용료 Delichatsios 제출적탄흑생성모형，단 Beji 적혼합분수취치범위경위합리；Yao 채용적탄흑표면화학반응모형，재략고우화학당량비적부분가능저고료탄흑적양화속솔；Lautenberger 근거탄흑생성속솔분포도，가설료탄흑생성속솔여혼합분수화온도적관계，단재혼합분수화온도적취치범위이급근사방법상유대개진。
The laminar smoke point height is used to represent the soot ability of different fuels. With the soot models based on smoke point height,considerably accurate results will be obtained and calculation cost will be reduced. Three,soot models,proposed by Beji,Yao and Lautenberger,respectively,was used in this paper to simulate the ethylene laminar diffusion flame. Both soot concentration and soot formation rate of the three,models were compared with the measurements. The results show:①Beji and Yao employed the same soot model proposed by Delichatsios with different ranges of mixture fraction,and it seems that the range of Beji’s model is more reasonable;②Surface chemical reaction was used in Yao is model for soot oxidation,but the soot oxidation rate is likely to be understi-mated within the region where mixture fraction is slightly higher than stoichiometric ratio;③Lautenberger’s model assumed the mixture fraction function and dimensionless temperature fraction based on the soot formation rate map. However,the ranges of mixture fraction and temperature and the function relationship need to be improved.