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Clarification of Vortex Structure and Evaporation Process of Unsteady Spray and Analysis of Chemical Reaction of its Flame

非定常喷雾涡流结构和蒸发过程的阐明及其火焰化学反应分析

基本信息

批准号：
13650237
负责人：
FUJIMOTO Hajime
金额：
$ 2.3万
依托单位：
DOSHISHA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The special feature of the flame of unsteady spray is the generation of soot. As a consequence, it is very significant to analyze the flame characteristics under the standpoint of the chemical reaction.The analysis of this kind of flame was carried out under the following means in this term :1.The model of the flame proposed by the other researcher was applied to the calculation.2.The polycyclic aromatic hydrocarbon with 1, 2, 3 and 4 rings was calculated by use of the model of its growth proposed by the other researcher.3.CHMKIN-III was applied to the calculation of elementary reaction.4.SENKIN was used to calculate the profile of concentration of chemical species.5.The temperature profile was given by the experimental results of the steady burner flame.6.The ambient gas was air, the initial temperature was 900 [K], the initial pressure was 8.3 [MPa] and the equivalence ratio was 4.0. The combustion was kept at the constant pressure.7.N-heptane whose cetane number was 56 was referenced as the representative fuel for a CI engine. The results of this fuel was compared to that of the oxygenated fuel.The main conclusions through the means mentioned above are as follows.a)It is able to calculate the sequential processes of the consumption of n-heptane, the heat pyrolysis from n-heptane to lower unsaturated hydrocarbons, the growth to aromatic hydrocarbns and the production and consumption of main species.b)The quantity of lower unsaturated hydrocarbons in the case of oxygenated fuel decrease over 50 [%] comparing with case of n-heptane. It is notable that the decrease in the polycyclic aromatic hydrocarbons is distinguished in the case of oxygenated fuel.c)The production of polycyclic aromatic hydrocarbons of oxygenated fuel is differen due to its molecular structure.

非稳态喷雾火焰的特点是产生碳烟。因此，从化学反应的角度分析火焰特性是非常有意义的，本学期对这种火焰的分析是按以下方法进行的：1.采用前人提出的火焰模型进行了计算。2.以1，2，3和4环是通过使用其他研究者提出的生长模型计算的。4. SENKIN用于计算化学物种的浓度分布; 5.温度分布6.环境气体为空气，初始温度为900 [K]，初始压力为8.3 [MPa]，当量比为4.0。7.以十六烷值为56的正庚烷作为CI发动机的代表燃料。主要结论如下：（1）可以计算正庚烷的消耗、正庚烷热裂解为低级不饱和烃的过程，芳香族植物的生长及主要种类的生产和消费。B）与正庚烷相比，含氧燃料中低级不饱和烃的量减少了50%以上。值得注意的是，在氧化燃料的情况下，多环芳烃的减少是显著的。c）由于其分子结构，氧化燃料的多环芳烃的产生是不稳定的。