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This article concerns the flame dynamics of a bluff body stabilized turbulent premixed flame as it approaches lean blowoff. Time resolved chemiluminescence imaging along with simultaneous particle image velocimetry and OH planar laser-induced fluorescence were utilized in an axisymmetric bluff body stabilized, propane-air flame to determine the sequence of events leading to blowoff and provide a quantitative analysis of the experimental results. It was found that as lean blowoff is approached by reduction of equivalence ratio, flame speed decreases and the flame shape progressively changes from a conical to a columnar shape. For a stably burning conical flame away from blowoff, the flame front envelopes the shear layer vortices. Near blowoff, the columnar flame front and shear layer vortices overlap to induce
high local stretch rates that exceed the extinction stretch rates instantaneously and in the mean, resulting in local flame extinction along the shear layers. Following shear layer extinction, fresh reactants can pass through the shear layers to react within the recirculation zone with all other parts of the flame extinguished.
This flame kernel within the recirculation zone may survive for a few milliseconds and can reignite the shear layers such that the entire flame is reestablished for a short period. This extinction and reignition event can happen several times before final blowoff which occurs when the flame kernel fails to reignite the shear layers and ultimately leads to total flame extinguishment.
燃烧是获得能量的一种主要方式,同时又是造成大气污染的重要因素之一。使用Lavision公司的FlowMaster可以实时、在线的对火焰成像,并且得到组分浓度、气体组成与火焰温度的定量信息。(激光)汽缸内成像技术的发展在很大程度上推动了新的发动机技术的出现(如直接注入技术和倾斜发动机)
Lavision的EngineMaster可以提供关于燃料准备情况、热点成像、火焰传播、No形成和烟雾生成的有关信息
技术参数:
应用
> 研究火焰、燃烧炉/器、涡轮机、高压燃烧系统、化学反应器等燃
烧现象
> 研究点火现象, 激波管,汽油机、柴油机的内部燃烧现象.
测量能够给出的信息:
> OH*, CH*, C2*等成分的分布
火焰温度,火焰位置与稳定性
火焰前端位置及传播, 点火现象的发生
> 总气体浓度, 温度场
> 气体组成,燃料/空气混合, 温度
> 烟雾体积分数
> 燃料预燃情况, 尾气回收成像
> OH 形成, NO 产生,冲击效应
火焰中的自由基如:CH, CN, NH, CO, C2, NO2, SO2 等
性能
> 进行指定曲柄角分辨测量, 和曲柄角周期相关的统计分析
> 具有发动机同步接口
> 在一个曲柄角周期内的高速测量 (瞬态分析)
主要特点:
特殊应用和配置
> 在极小通光孔经情况下可以进行的内窥镜式(钥匙孔式)成像
> 用于火焰冷却的尾气再循环过程
> 玻璃器件成型所用火焰的性能分析
> CVD 过程控制:石英生产的火焰水解
> 应用于高压燃烧过程分析的激光诱导白炽光 (LII)技术
> 电荷分层现象的化学计量学 地图 (l-值)
可升级到:
SootMaster :用于 LII测量, SprayMaster 和 FlowMaster
仪器简介:
PLIF平面激光诱导荧光火焰燃烧检测系统PLIF-FlameMasterLaVision 非流线体稳定的湍动预混火焰的吹灭动力学,PLIF-FlameMaster
PLIF平面激光诱导荧光火焰燃烧检测系统PLIF-FlameMasterLaVision 非流线体稳定的湍动预混火焰的吹灭动力学信息由北京欧兰科技发展有限公司为您提供,如您想了解更多关于PLIF平面激光诱导荧光火焰燃烧检测系统PLIF-FlameMasterLaVision 非流线体稳定的湍动预混火焰的吹灭动力学报价、型号、参数等信息,欢迎来电或留言咨询。