Abstract

Engine particulate filters have been widely applied for both compression and spark-ignition engines due to the stringent emission regulations across the world. The in-situ density of ash deposits is critical to the degradation of filter performance and cannot be readily measured by traditional methods. In the present study, a method of measuring the density of ash deposits across a filter is developed using an industrial X-ray computed tomography (CT) apparatus. An array of density references attached to the filter sample are utilized to establish the correlation between ash density and CT image grayscale, which then is applied to estimate the density of ash deposits in a filter. The CT results are in close agreement with the density data from the dedicated lab measurements, where the average differences are around 8%. The CT approach has been demonstrated as a nondestructive means to measure the ash deposits in the three-dimensional space, offering more efficient, accurate, and reliable results than the traditional approaches.

Copyright © 2021 American Association for Aerosol Research

摘要

由于全球严格的排放法规，发动机微粒过滤器已广泛应用于压缩式和火花点火式发动机。灰烬沉积的原位密度对于过滤器性能的退化至关重要，并且无法通过传统方法轻松测量。在本研究中，使用工业 X 射线计算机断层扫描 (CT) 设备开发了一种测量过滤器上灰沉积密度的方法。过滤器样本上的一系列密度参考用于建立灰分密度和 CT 图像灰度之间的相关性，然后将其应用于估计过滤器中灰分沉积物的密度。CT 结果与专用实验室测量的密度数据非常一致，平均差异约为 8%。

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