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首页> 外文期刊>Measurement Science & Technology >Dynamical lag correlation exponent based method for gas-solid flow velocity measurement using twin-plane electrical capacitance tomography
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Dynamical lag correlation exponent based method for gas-solid flow velocity measurement using twin-plane electrical capacitance tomography

机译：基于动态滞后相关指数的双平面电容层析成像气固流速测量方法

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摘要

In a twin-plane electrical capacitance tomography (ECT) system, velocity measurement of two-phase flow is transformed into the time delay estimation problem, while the nongaussianity and nonstationarity of two-phase flow signals have put the validity of the conventional cross-correlation algorithm in jeopardy. To improve the robustness and reliability of flow velocity measurement, an alternative method is proposed based on the dynamical lag correlation exponent and applied to coal ash measurement in a pneumatic pipeline. Different from the cross-correlation method which picks the peak point of the cross-correlation function as the delayed frames between the upstream and downstream signals, the proposed method determines the delayed frames by finding the minimum point of the dynamical lag correlation exponent. The preliminary results of flow velocity measurement indicate that the proposed method is capable of detecting various velocities (8-25 m s~(-1)), which is useful for monitoring and predicting flow instability.
机译：在双平面电容层析成像（ECT）系统中，两相流的速度测量转化为时延估计问题，而两相流信号的非高斯性和非平稳性使常规互相关的有效性成为可能。算法处于危险之中。为了提高流速测量的鲁棒性和可靠性，提出了一种基于动态滞后相关指数的替代方法，并将其应用于气动管道中的煤灰测量。与采用互相关函数的峰值点作为上下游信号之间的延迟帧的互相关方法不同，该方法通过找到动态滞后相关指数的最小点来确定延迟帧。流速测量的初步结果表明，该方法能够检测出各种速度（8-25 m s〜（-1）），对于监测和预测流动的不稳定性很有用。

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