Modeling and Simultaneous Measurement of Local Concentration of Soot and Aromatic Carbon Concentration and Temperature

局部烟灰浓度和芳碳浓度及温度的建模和同步测量

基本信息

批准号：
17560186
负责人：
AKAMATSU Fumiteru
金额：
$ 2.3万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

Laser Induced Incandescence (LII), Time-Resolved Laser Induced Incandescence (TIRE-LII) and Interferometric Laser Imaging Droplet Sizing (ILIDS) were applied to investigate soot formation process in a spray flame stabilized in laminar counter-flow field. Three quantities of soot, soot volume fraction, soot particle sizes, and soot number density in the flame were accessible by LII and TIRE-LII methods. The distribution of two-dimensional soot volume fractions was measured by LII method, and the distribution of two-dimensional soot primary particle sizes was measured by TIRE-LII method. The basic idea of TIRE-LII method is to measure the incandescence signal at two different timing during the cooling of the soot particles and to calculate a signal intensity ratio. In addition, soot number density was calculated from soot volume fraction and soot particle size measured by LII and TIRE-LII methods, respectively. In the spray combustion, the flame formation is affected by the droplet size … More distribution of spray, we control the spray characteristics by the vibratory orifice atomizer. The frequency of LII soot production is increased as the mean droplet size is larger, and in the many cases, spatial distribution of soot concentration in the spray flame were ring-shaped with inner cavity and the soot primary size was larger around the outside region of the flame than around the center region of the flame. To the contrary, the soot number density was higher around the center region of the flame than around the outside region of the flame. This indicates that soot is formed mainly around the center region of a flame and soot grows up as it is conveyed to outside region. ILIDS and LII techniques were simultaneously applied to study the relation between spatial distribution of spray droplet and soot concentration in order to understand soot formation process in the spray flame. ILIDS method was used to get spatial information of the droplet characteristics by compressing defocus image into liner interferogram. It is found that the larger the droplets size is, the nearer the droplets fall to low burner, that is the large droplets don't vapor until they get enough heat. And the inner cavity of soot concentration was resulted from unburned droplets that exist in the center region of the flame due to absorbing the heat around them or making fuel-rich condition around them. Less

激光诱导的白炽灯（LII），时间分辨激光诱导的白炽灯（TIRE-LII）和干涉量学激光成像液滴尺寸（ILID）用于研究在层中稳定的lamininar柜台式水上稳定的喷雾火焰中的烟灰形成过程。 LII和Tire-Lii方法可以访问三量烟灰，烟灰体积分数，烟灰颗粒尺寸和火焰中的烟灰数密度。通过LII方法测量了二维烟灰体积分数的分布，并通过Tire-LII方法测量了二维烟灰一级粒径的分布。轮胎-LII方法的基本思想是在冷却烟灰颗粒过程中在两个不同的时机下测量白炽信号，并计算信号强度比。此外，分别是根据烟灰体积分数和烟灰粒径分别通过LII和TIRE-LII方法测量的烟灰数密度。在喷雾组合中，火焰的形成受液滴尺寸的影响……更多的喷雾分布，我们通过振动孔雾化器控制喷雾特性。由于平均液滴尺寸更大，LII烟灰产生的频率增加了，在许多情况下，喷雾火焰中烟灰浓度的空间分布呈环形，内部空腔和火焰外部区域周围的柔软初级尺寸大于火焰中心区域。相比之下，火焰中心区域周围的灵魂数密度高于火焰的外部区域。这表明烟灰主要在火焰的中心区域周围形成，而灵魂则在传达给外部地区时长大。简单地应用了ILID和LII技术来研究喷头的空间分布与灵魂浓度的空间分布，以了解喷雾火焰中的软形成过程。 ILIDS方法用于通过将散焦图像压缩到衬里干扰中来获取液滴特性的空间信息。发现液滴尺寸越大，液滴越靠近低燃烧器，那是大液滴不会蒸气，直到它们得到足够的热量。烟灰浓度的内部腔是由于吸收周围的热量或周围使燃料富含燃料的状态而导致火焰中心区域中存在的未燃烧的液滴产生。较少的