Abstract
The Acoustic Doppler Current meter is a most commonly device for the velocity measurement of the seawater in the ocean. We had designed an equipment to calibrate the Acoustic Doppler Current meter in the laboratory, which is mainly composed of a vertical circulating water tank and a system of Laser Doppler Velocimetry. The vertical circulating water tank is the key device of the calibration equipment. The optimization of flow field is carried out by the software, CFD. The optimization of structure intensity, modal analysis and low noise is carried out by the software, ANSYS. We had also used the propeller map to design the power section of the water tank. Through the comparison of the velocity of the flow between Acoustic Doppler Current meter and LDV at the same position in the working section of the water tank, the former can be calibrated, because the wavelength of optics is much less than that of acoustics in the water. After the experimental test, we found that when the fluid flows in the vertical circulating water tank, there exists no resonance phenomenon and the velocity of the flow in the working section is approximately proportional to the rotation speed of the propeller.
Highlights
In 1963, Koczy proposed the use of acoustic Doppler principle for velocity profile measurement[1]
The calibration system of Doppler current meter in the laboratory designed in the paper is mainly composed of a vertical circulating water tank and a laser Doppler speed measurement device
In the process of the water flowing through the circulating water tank, the flow velocity and pressure of the water tank change due to the change of the radius of the water tank, the corner, etc., must be considered, which cause the vibration of the tank body, radiates noise, and has a certain impact on the life and safety of the circulating water tank[5]
Summary
In 1963, Koczy proposed the use of acoustic Doppler principle for velocity profile measurement[1]. The calibration of an acoustic Doppler current meter is the necessary step in the flow velocity measurement. The calibration system of Doppler current meter in the laboratory designed in the paper is mainly composed of a vertical circulating water tank and a laser Doppler speed measurement device. The stability of the flow field of the working section of the circulating water tank will greatly affect the calibration accuracy. The flow velocity of the working section of the circulating water tank is measured by LDV, and compared with the measured flow velocity by the acoustic Doppler current meter to complete the calibration of the acoustic Doppler current meter. The research results in this paper fill with the blank of calibrating the Doppler current meter device in the laboratory, and provide reference for the structure and low noise design of the circulating water tank. A total of 9 sets of models were used for the three types of layout, and compared with the model without the deflectors to validate the effect of the suppression of flow separation
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