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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.

字化过程，该技术可以在颗粒浓度相对很高的情况下获得高分辨率速度场，而3D

粒子跟踪测速仅能适用于颗粒浓度较低的情况(从而得到的速度矢量场的空间分辨

率也很低 )。这种方法获得的是完全空间体积内的瞬时结果，与平面PIV扫描式工

作不同，它很适合需要双曝光间隔dt 很小的高速流动以及利用高帧率相机进行高

时间分辨率进行测量的情况。

 湍流研究
 三维流体结构的可视化
 完整的三维漩涡分析
 流体结构的相互作用
 

在测量体内的示踪颗粒由高能量的脉冲激光光源照亮，其散射光由4个不同方向拍

摄的CCD相机记录下来，然后由三维空间中每一点光强的分布， 利用层析重构算

法(MART)对三维空间颗粒的分布进行重构。给定的三维诊断区域中颗粒的位移是

通过双曝光形成的两个重构颗粒图像进行三维互相关获得的，其中利用了变形立体

网格的多重网格迭代算法。      

         层析PIV(Tomo-PIV)是一种全新的三维速度场测量技术。颗粒的速度信息是
 由在顺序两次曝光时刻重构出来的粒子三维图像的互相关处理得到的。通过全数

体视层析粒子成像测速系统(Tomo-PIV)粒子测速仪FlowMaster-Tomo 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体视层析粒子成像测速系统(Tomo-PIV)粒子测速仪FlowMaster-Tomo 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。

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