FlowMaster-TR粒子测速仪LaVision 非流线体稳定的湍动预混火焰的吹灭动力学

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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.

1.   系统可以测量速度及加速度场
2.   湍流过程的脉动参量。
3.   提供随时间演化的速度场及其相关信息
4.   获得随时间变化的湍流信息等。
5.   基于时间域的本征正交分解——POD-模式分解
6.   漩涡结果特性随时间的变化规律
7.   时空相关
8.   流动结构跟踪
9.   能量谱
10.   加速度场
11.   流动的时间尺度。
      系统指标：
12.   LaVision提供的FlowMaster
      High-Speed系统包含根据尖端技术设计的全数字化高速相机，拍摄帧率在1k x 1k像素分辨率下可以达到 5
      kHz，降低图像分辨率拍摄帧率可以达到100 kHz。
13.   高重复频率单腔或双腔固体激光器，每脉冲能量可以达到50 mJ。
14.   所有硬件部件都可以DaVis软件包集成和控制。

     FlowMaster High-Speed 系统为流体动力学分析提供了新的研究手段。它同时提供了基于数字PIV的空间流场信息和每一点随时间的演化信息。
 测试系统功能和性能指标：
 系统功能：

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