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基于双针光纤探头(D-OFP)的气液两相流测量方法可实现气泡粒径、弦长、运动速度、含气率等参数测量。目前,D-OFP已广泛应用于环境工程和石油化工等领域,但由于破碎波卷入气泡形状的不规则性及运动复杂性等特点,若直接将D-OFP用于破碎波卷入气泡尺寸测量,测量的精度和可靠性将有所降低。为克服上述不足,该文从D-OFP测量气泡尺寸的原理出发,着重分析了气泡侧向运动产生的测量误差,得出结论:当气泡运动方向与探头主轴方向夹角小于10o时的测量结果是准确合理的。并提出了基于双针光纤探头(D-OFP)改进的四针光纤探头(F-OFP)测量法,通过建立F-OFP数学模型,推导出了F-OFP多维度测量破碎波卷入气泡尺寸的基本公式,论证了F-OFP多维度测量破碎波卷入气泡的可行性,为破碎波卷入气泡尺寸分布研究提供了理论依据。
The gas-liquid two-phase flow measurement method based on the double-needle fiber optic probe (D-OFP) can measure the bubble diameter, chord length, velocity and gas content. At present, D-OFP has been widely used in the fields of environmental engineering and petrochemical industry. However, due to the irregular shape and the complexity of movement of the broken wave into the bubble, if the D-OFP is directly used to break the wave into the bubble size Measurement, measurement accuracy and reliability will be reduced. In order to overcome the above shortcomings, the paper starts from the principle of measuring bubble size by D-OFP, and focuses on the measurement error caused by lateral movement of bubble. The conclusion is drawn that when the angle between the direction of bubble motion and the direction of the spindle is less than 10o Is accurate and reasonable. The F-OFP method based on the improved double-needle fiber probe (D-OFP) is proposed. By establishing the F-OFP mathematical model, the F-OFP multi- The feasibility of the F-OFP multi-dimension measurement of the entrainment of the breaking wave into the bubble is demonstrated. This provides a theoretical basis for the study of the bubble size distribution of the breaking wave.