Effects of Particle Concentration and Size on the Pulsation
Characteristics of Oil
Abstract
Oil flow with different particles was tested in a square tube using PIV
measurement technology. The instantaneous velocity vector data of the
flow field were acquired in oil with different particle sizes and
concentrations of the particles, and the distributions of the transient
speed and average speed and the pulsation intensity of oil along the
streamwise and wall-normal directions were analyzed. The results showed
that the distribution of the streamwise pulsation intensity of oil
changes more gently along the wall-normal direction in the center region
and changes more steeply in the near-wall area. With increasing particle
concentration, the streamwise pulsation intensity of oil decreases
gradually. The distribution of the wall-normal pulsation intensity of
oil along the wall-normal direction is roughly “w”-shaped under
different particle grain diameters. The amplitude value of the
wall-normal pulsation intensity of oil is larger in the center region
and near-wall area, and the effect of the particle concentration in oil
on the distribution of the wall-normal pulsation intensity of oil is not
unidirectional. With increasing particle concentration, the main
frequency trend of the oil speed along the streamwise and wall-normal
directions decreases, and the streamwise average speed of the oil
increases. The change in the wall-normal average speed of oil decreases
when the particle concentration is under 3.00 ppm, and the normal
velocity of oil increases when the particle concentration is over 3.00
ppm