蒸发管燃烧室蒸发特性和贫油熄火极限的研究

发布时间：2018-06-03 22:25

本文选题：微型涡喷发动机 + 蒸发管燃烧室　；参考：《中国科学院研究生院(工程热物理研究所)》2015年硕士论文

【摘要】：蒸发管燃烧室由于其供油压力低、结构简单等优点,已经被广泛应用到微型涡喷发动机上。但是对于该类燃烧室的贫油熄火极限的研究尚不完善,而贫油熄火极限是燃烧室的重要性能指标之一。因此本文通过试验和数值模拟的手段对蒸发管燃烧室的贫油熄火极限展开了以下研究：1)研究了雾化对于贫油熄火的影响,采用旋流杯燃烧室,对其雾化进行分析,并结合雾化试验结果改进了Lefebvre熄火经验公式,同时使用数值模拟手段分析燃烧室熄火点附近流场变化,得出了熄火点附近特征参数的变化规律。2)设计蒸发管试验件,搭建蒸发管试验台,对蒸发管在不同工作状态下的蒸发率进行了试验研究,通过试验得到了空气流量、燃油流量和蒸发管管径等参数对于蒸发率的影响。3)进行蒸发管燃烧室的常压熄火试验,得到了燃烧室的熄火极限,再通过数值模拟得到熄火状态下蒸发管的空气和燃油流量,结合蒸发率试验得到熄火状态下的蒸发率。将蒸发率作为参数加入到Lefebvre经典熄火经验公式中,拟合得到适用于蒸发管燃烧室的熄火经验公式。4)通过蒸发管燃烧室熄火数据对得到的熄火经验公式进行了验证,认为该经验公式具有一定的准确性。论文最后对全文工作进行了总结,指出研究的缺点和不足,并提出了进一步改进的方向。
[Abstract]:The evaporative tube combustor has been widely used in micro turbojet engine because of its low fuel supply pressure and simple structure. However, the study on the limit of lean oil flameout of this kind of combustor is not perfect, which is one of the important performance indexes of the combustor. In this paper, by means of experiment and numerical simulation, the following research is carried out on the limit of lean oil flameout of evaporative tube combustor: 1) the influence of atomization on lean flameout is studied. The swirl cup combustor is used to analyze the atomization of the combustor. Combined with the atomization test results, the empirical formula of Lefebvre extinguishing is improved. At the same time, numerical simulation method is used to analyze the flow field change near the extinguishing point of the combustion chamber, and the variation law of characteristic parameters near the extinguishing point is obtained. 2) the evaporator tube test piece is designed. The evaporation rate of the evaporative tube in different working conditions was studied by setting up an evaporative tube test rig, and the air flow rate was obtained through the experiment. The influence of fuel flow rate and diameter of evaporator tube on evaporation rate. 3) the test of evaporative tube combustion chamber under atmospheric pressure is carried out, and the extinguishing limit of combustion chamber is obtained, and the air and fuel flow rate of evaporator tube under flameout state are obtained by numerical simulation. Combined with evaporation rate test, the evaporation rate under the condition of extinguishing is obtained. The evaporative rate is added to the Lefebvre's classical empirical formula of extinguishing, and the formula. 4) the empirical formula of extinguishment is verified by the data of evaporative tube combustion chamber. It is considered that the empirical formula has certain accuracy. Finally, the paper summarizes the work of the paper, points out the shortcomings and shortcomings of the research, and puts forward the direction of further improvement.
【学位授予单位】：中国科学院研究生院(工程热物理研究所)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V279;V231.2

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