【摘要】 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。更多还原

【Abstract】 Based on the analysis on the process of ultrasound imaging, an error correction method was developed to reduce the velocity measuring error of flow with uniform acceleration by ultrasound imaging velocimetry(UIV). The process of velocity measuring of flow with uniform acceleration via the traditional UIV method was numerically simulated to investigate the effects of acceleration on the error in velocity measurement. The results indicate that the measuring error of traditional UIV increases with increasing acceleration and sampling time. Compared with traditional UIV, the error correction method developed here is effective to reduce the velocity measuring error of flow with uniform acceleration.更多还原