抄録
This paper presents the applicability of a ultrasound time-domain correlatioon (UTDC) method to turbulent flows. The system is based on the cross-correlation between two consecutive echoes of ultrasonic pulses to detect the velocity. The UTDC has two advantages over a conventional ultrasound pulsed Doppler method. First, the system has a better time resolution than the pulse Doppler method. Second, the system does not have a limitation in maximum measurable velocity, which is limited by Nyquist's sampling theorem. We measured velocity profiles in turebulent pipe flows at low Reynolds number, and compared the results with the data obtained by a direct numerical simulations and by a laser Doppler velocimetry.
