LaVisionFlowMaster-Micro显微粒子成像测速系统(Micro PIV) 非流线体稳定的湍动预混火焰的吹灭动力学

点击查看下载LaVisionFlowMaster-Micro显微粒子成像测速系统(Micro PIV) 非流线体稳定的湍动预混火焰的吹灭动力学相关资料，进一步了解产品。

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.

     FlowMaster 显微PIV系统设计用来测量微米级空间分辨率下示踪颗粒速度场。它利用粒子成像测速原理，将常规 PIV 应用拓展到微尺度范围。
     系统采用双脉冲Nd:YAG激光作为光源，通过大数值孔径光圈荧光显微镜聚焦到微流动模型上。微流动采用荧光颗粒作为示踪物，通过显微镜采集到的颗粒散射光的波长比入射光波长要长。由于波长不同，这个光波信号通过一个滤波透镜与入射光分离开，并由FlowMaster系列相机拍摄下来。双曝光产生的颗粒图像，经过高级精密的PIV算法处理后获得微尺度流场的速度场结果。
 系统主要参数指标：
 1. 速度场测试范围：100微米至宏观尺度
 2. 典型应用所需显微物镜放大倍率：5X至40X
 3. 显微物镜类型：平场长工作距离荧光物镜。
 4. 标配CCD相机灵敏度：65 % @ 500 nm
 5. 标配CCD相机分辨率：1376 x1040 像素
 6. 典型情况下的测量速度上限：采用5X显微物镜，双帧时间间隔为500纳秒，则测量速度上限约为20米/秒。
 7. 显微镜主体可选正置和倒置两种型号。
 8. 速度场分析精度：可达0.1像素。
 
 
       

LaVisionFlowMaster-Micro显微粒子成像测速系统(Micro PIV) 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LaVisionFlowMaster-Micro显微粒子成像测速系统(Micro PIV) 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。

注：该产品未在中华人民共和国食品药品监督管理部门申请医疗器械注册和备案，不可用于临床诊断或治疗等相关用途