According to the diversity of fluid composition and complexity of the flow pattern of rainwater in the pipeline, using for reference of flow filed measurement in Particle Image Velocimetry, a rainwater flow velocity measurement method based on cross-correlation a-nalysis is proposed. The traditional method of cross -correlation is computing large and time consuming. The fast algorithm of correlation a-nalysis is studied, and used FFTW fast Fourier transform algorithm library in correlation analysis software. Establish a pipeline rainwater flow calibration device using weir slot. The results show that extracting an average speed from the velocity field well smoothed the flow complicated variety, can accurately measure the average velocity of rainwater and effectively applied to actual measurements.%针对雨水管道中流体成分的多样性和流动型态的复杂性,借鉴粒子图像测速中的流场测量思想,提出了一种基于互相关分析的管道雨水流速测量方法；传统的互相关方法计算量很大,文章对互相关分析的快速算法进行了研究,并将FFTW快速傅里叶变换算法库应用于测量软件的实现中；使用堰槽建立了管道雨水流速标定装置,在不同的流速下对该方法进行了实验验证；实验证明,利用速度场提取平均速度的方法很好地平滑了管道中流体流动的复杂多变性,相对测量误差在6％以内,能够比较准确地测量出雨水的平均流速,可有效应用于实际测量.
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