Instantaneous PIV data related to the leakage flow of a low-speed axial-flow fan with rotating shroud

The data yield from 2-D PIV measurements taken in the tip gap region of a low-speed axial-flow fan flush mounted on a flat panel. About 3000 instantaneous velocity distributions (frames) in the meridional plane are provided together with the corresponding angular position in the rotor frame. The measurement domain is 70 mm x 95 mm large and contains 41x55 grid points. Each frame has been related to a 4-deg angular window within one rotor revolution, resulting in 90 windows for the whole rotor, that is 10 windows per blade passage. Up to 33 frames per window have been acquired. As the sampling frequency is low compared to the rotational frequency, the frames related to each operating condition may be considered statistically independent. Three different operating conditions have been investigated (design point at high and low speed, and free-discharge at high speed), resulting in three folders containing about 3000 csv files. Operating point, rotational speed, and bin are included in the file name. Each file is composed by lines containing axial and radial coordinates of a grid point, together with the correspondent axial and radial velocity components.