介绍热线风速仪在发动机排气管内二维周期性非定常流场测试中的应用。对热线探头标定前的预处理、实测状态与标定状态差异引起误差的修正和流动方向的判别等测试中一些值得注意的问题和相应的处理方法进行了研究。 The application of hot wire anemometer in two-dimensional periodic unsteady flow field test in engine exhaust pipe is introduced. Some problems that should be paid attention to before the calibration of the hotline probe, such as the pretreatment before the calibration of the hotline probe, the correction of the error caused by the difference between the measured state and the calibration state and the determination of the flow direction, and the corresponding treatment methods were studied.