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在分析雨水管道复杂流体成分的基础上,提出利用管道内的固体颗粒作为示踪粒子,采用激光多普勒测速的方法对管道流体进行速度测量。为了验证应用的合理性,根据条纹模型和散射机理建立了雨水管道内流体LDV的数学模型,并通过数值模拟,分析了雨水管道流体中示踪粒子和速度测量精度之间的关系。然后对模拟的信号进行时频分析,得到雨水管道中的流速。通过实验验证,实际效果和数值模拟结果符合良好,说明LDV能够精确地测量出雨水管道中的流体速度。
Based on the analysis of the composition of the complex fluid in the rainwater pipeline, it is proposed to use the solid particles in the pipeline as the tracer particles and to measure the velocity of the pipeline fluid by laser Doppler velocimetry. In order to verify the rationality of the application, the mathematical model of fluid LDV in rainwater pipeline was established according to the streak model and the scattering mechanism. The relationship between the tracer particle and velocity measurement accuracy was analyzed by numerical simulation. Then the time-frequency analysis of the analog signal to get the flow rate in the rainwater pipeline. The experimental results show that the actual results and numerical simulation agree well with each other, which shows that LDV can accurately measure the fluid velocity in rainwater pipe.