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基于对超声成像过程的分析建立了一种利用超声成像测速技术(ultrasound imaging velocimetry,UIV)测量非透明管道内匀加速流体速度场的误差修正方法。数值模拟了传统UIV技术测量匀加速流体二维速度场的过程,并定量分析了流体加速度对传统UIV技术速度测量误差的影响。研究结果表明,传统UIV技术随着采样时间和流体加速度的增加,测速误差逐渐增大。利用该文所建立的考虑流动加速度影响后的速度修正方法对传统UIV技术所得速度值进行修正后获得的流体速度分布与理论值基本吻合,表明该文所提出的速度修正方法可有效提高UIV技术的测量精度。
Based on the analysis of the ultrasonic imaging process, an error correction method for measuring the uniform velocity field in nontransparent tubes by ultrasonic imaging velocimetry (UIV) was established. The process of measuring the two-dimensional velocity field of uniform acceleration fluid by the traditional UIV technique is numerically simulated. The influence of fluid acceleration on the velocity measurement error of the traditional UIV technique is quantitatively analyzed. The results show that, with the increase of sampling time and fluid acceleration, the velocity error of traditional UIV technology increases gradually. By using the velocity correction method which is established by this paper and considering the influence of flow acceleration, the velocity distribution obtained by the conventional UIV technique is basically consistent with the theoretical value, which shows that the velocity correction method proposed in this paper can effectively improve the UIV technique The measurement accuracy.