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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Direct measurement of local instantaneous laminar burning velocity by a new PIV algorithm
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Direct measurement of local instantaneous laminar burning velocity by a new PIV algorithm

机译：通过新的PIV算法直接测量局部瞬时层流燃烧速度

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摘要

This paper presents a new experimental approach using PIV technique to measure the local instantaneous laminar burning velocity of a stretched premixed flame. Up to now, from experimental techniques, this physical property was only accessible in average and the instantaneous interactions of flame with flow structures, mixture variations and walls could not be considered. In the present work, the local burning velocity is measured as the difference between the local flame speed and the local fresh gas velocity at the entrance of the flame zone. Two original methods are proposed to deduce these quantities from pair of particle images. The local flame speed is measured from the distance between two successive flame positions. For the flame localization, a new extraction tool combined with a filtering technique is proposed to access to the flame front coordinates with sub-pixel accuracy. The local fresh gas velocity near the flame front is extracted from the maximum of the normal velocity profile, located within 1 mm ahead of the flame front. To achieve the required spatial resolution, a new algorithm based on adaptive interrogation window scheme has been developed by taking into account the flow and flame front topologies. The accuracy and reliability of our developments have been evaluated from two complementary approaches based, respectively, on synthetic images of particle and on the well-established configuration of outwardly propagating spherical flames. In the last part of the paper, an illustration of the potentials of our new approach is shown in the case of a laminar flame propagating through a stratified mixture.
机译：本文提出了一种新的实验方法，该方法使用PIV技术测量拉伸的预混火焰的局部瞬时层流燃烧速度。到目前为止，从实验技术上来说，这种物理性质只能平均地获得，而火焰与流动结构，混合物变化和壁的瞬时相互作用尚不能考虑。在当前工作中，局部燃烧速度被测量为局部火焰速度与火焰区域入口处局部新鲜气体速度之间的差。提出了两种原始方法来从一对粒子图像中推导这些量。根据两个连续火焰位置之间的距离来测量局部火焰速度。对于火焰定位，提出了一种与过滤技术相结合的新提取工具，可以以亚像素精度访问火焰前沿坐标。靠近火焰前沿的局部新鲜气体速度是从正常速度曲线的最大值中提取的，该最大值位于火焰前沿前方1毫米之内。为了实现所需的空间分辨率，考虑到流动和火焰前部拓扑，开发了一种基于自适应询问窗口方案的新算法。我们的开发的准确性和可靠性已通过两种互补方法进行了评估，分别基于颗粒的合成图像和向外传播的球形火焰的公认结构。在本文的最后一部分中，展示了层流穿过层状混合物传播时，我们的新方法的潜力。

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