Study of multiphase flows in a flame using electric capacitance tomography
Jing Liu1, Shi Liu1, Shanxun Sun1, Jianguang Xu1, Xin Liu2
1 North China Electric Power University, 2 Beinong Road, Chongping District, Beijing 102206, PR China
2 Beijing Society of Thermophysics and Energy Engineering, 11 Yi Zhongguancun Road, Haidian District, Beijing 100190 China
Electrical capacitance tomography (ECT) is a visualization technology which can be applied to concentration measurement for the multiphase flow. It features with fast response, low cost, easy implementation, non-intrusiveness, non-radiation and the capability of acquiring 2D or 3D process parameter information. As a promising technique, ECT is widely applied in many aspects and is becoming one of the key topics in PT research. However, the accuracy of ECT reconstruction images depend highly on the precision of the sensitivity maps. Therefore, we set the aim to investigate a quite effective and accurate 3D sensitivity map for ECT.
In this paper, a novel sensor which combines a planar sensor with eight electrodes attached on the base planar surface and a cylindrical sensor with eight electrodes attached on the outer surface of the frame. It has been tested for the visualization of the flames in an EV burner. Three-Dimensional sensitivity maps of these two different kinds of sensors have been fused into a novel 3D sensitivity map. The experiment images of a flame were in good agreement with the results of computational fluid dynamics (CFD) simulations, and ECT images well correspond to the variation of the combustion intensity, which inverse test and verify the feasibility of the 3D fused sensitivity calculated in this paper.
Keywords Electrical capacitance tomography (ECT), 3D fuse sensitivity maps, flame detection, 3D image reconstruction
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