Author(s)

Qingmin Pu, Jing Sun, Yulin Jiang and Wenbin Ding

Corresponding Author

Qingmin Pu

ABSTRACT

In the process of measuring the flow field distribution of the partially filled pipes with PIV particle image velocimetry, aiming at the insufficiency of the limited number of continuous measurements of velocimeter, a method for quickly calculating the required number of measurements for specified true value is proposed in this paper. The flow velocity is regarded as a superposition of the average flow velocity and the pulsation flow velocity, and the discriminant basis for measuring the change degree of the average flow velocity and the pulsation flow velocity is defined respectively. According to the discriminant basis, the measured data is analyzed, then the required number of measurements for calculating specified true value is determined. Finally, the optimal number of measurements for PIV particle image single point measurement is obtained by using the constraints of equal precision measurement. The experimental results show that the proposed method can quickly obtain the number of measurements to determine the specified true value, which has an important reference for engineering application.

KEYWORDS

PIV particle image velocimetry, Specified true value, Turbulence intensity, Optimal number of measurements