使用基于SLIPI的技术获得喷雾中液滴粒径和浓度分布图

2019/12/04   下载量： 0 次

方案摘要

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应用领域 其他
检测样本 其他
检测项目
参考标准 暂无

采用LaVision公司的SprayMaster系统，利用SLIPI技术有效抑制致密喷雾下的照明光束吸收和非照明区域粒子的散射。可以获得喷雾对象中液滴粒径和浓度的分布图。 Artium公司的PDI设备可以为上述测量提供验证和标定参考。

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Laser diagnostics have become state of the art tools for locally measuring droplet size, velocity and temperature in atomizing sprays. However, when applied in optically dense situations, these techniques suffer from measurement errors induced by unwanted effects such as laser intensity reduction along the path of propagation (light extinction), attenuation in signal intensity collected by the detector (signal attenuation) and multiple light scattering emerging from non-illuminated sections. It has been recently demonstrated that such issues can be addressed by means of imaging techniques based on structured illumination. Therefore, in this article, Structured Laser Illumination Planar Imaging (SLIPI) is applied in combination with the LIF/Mie ratio method and with the dual configuration (Dual-SLIPI) to extract a reliable 2D map of the Sauter Mean Diameter (SMD) and of the extinction coefficient (μe), respectively. This has been applied for the characterization of a hollow-cone water spray at injection pressures ranging between 20 and 50 bars. The SLIPI-LIF/Mie ratio is calibrated with measurement data from Phase-Doppler Interferometry (PDI). Furthermore, the measured droplet size distributions have been used to deduce the corresponding averaged droplet extinction cross-section (σe) using the Lorenz-Mie theory. Consequently, by dividing the 2D images of μe by σe a mapping of the droplet concentration could also be obtained. The changes of droplets size and concentration as a function of injection pressure are shown in this article.

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北京欧兰科技发展有限公司
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