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首页> 外文期刊>Ocean Engineering >A model for measuring the velocity vector of bubbles and the pierced position vector in breaking waves using four-tip optical fiber probe, Part Ⅰ: Computational method
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A model for measuring the velocity vector of bubbles and the pierced position vector in breaking waves using four-tip optical fiber probe, Part Ⅰ: Computational method

机译：用四尖端光纤探头测量气泡的速度矢量和破波中的刺穿位置矢量的模型，第一部分：计算方法

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A dual-tip optical fiber probe has been attempted to make measurement of bubble size in breaking waves, especially for the violent and aerated bubble plumes presented immediately after breaking in laboratory and field. However, the performance of field measurement based on such probe is not satisfactory due to the measurement error produced by the large numbers of escaped and missing bubbles. The objective of the present study and its companion are to evaluate the errors of bubble size measurement in breaking waves using a dual-tip optical fiber probe, and the errors were grouped as oncoming bubble errors, receding bubble errors and missing bubble errors in terms of the bubble motion relative to the probe. The study on errors shows that the incomplete velocity vector of bubble and missing pierced position vector where the tips contact the bubble are the major reasons for errors. In order to make error correction, this paper proposes a four-tip optical fiber probe to obtain these two vectors and other required parameters. The mathematical model of the recommended probe is derived, which enables the bubble velocity components in the x, y and z directions and the pierced position vector is the unique functions of several time intervals and probe's spatial distribution relationship. The optimized algorithm is suggested to calculate the velocity vector, the pierced position vector and other required parameters from time intervals taken from the output signals of the proposed probe. The model and algorithm claim that the velocity vector of bubbles and pierced position vector can be obtained as long as the time intervals can be captured by four-tip optical fiber probe. Verification and validation of the model is presented in the accompanying paper.
机译：已经尝试使用双尖端光纤探头来测量破裂波中的气泡大小，特别是对于在实验室和现场破裂后立即出现的剧烈气泡和充气气泡羽流。然而，由于大量逸出和丢失的气泡而产生的测量误差，基于这种探针的现场测量的性能并不令人满意。本研究及其目的是评估使用双尖端光纤探头在破裂波中气泡尺寸测量的误差，并将误差归类为即将到来的气泡误差，后退的气泡误差和丢失的气泡误差。气泡相对于探头的运动。对误差的研究表明，气泡的速度矢量不完整和尖端与气泡接触的穿孔位置矢量缺失是造成误差的主要原因。为了进行纠错，本文提出了一种四尖端光纤探头来获取这两个向量和其他所需参数。推导了推荐探针的数学模型，该模型可以实现x，y和z方向上的气泡速度分量，而刺穿的位置矢量是几个时间间隔和探针空间分布关系的唯一函数。建议使用优化算法从所提出的探头的输出信号中获取的时间间隔来计算速度矢量，穿孔位置矢量和其他所需参数。该模型和算法要求，只要可以用四尖光纤探头捕获时间间隔，就可以获得气泡的速度矢量和穿孔的位置矢量。随附的论文介绍了模型的验证和确认。

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