High-speed electrostatic rotary bells are widely used in the
automotive industry as they provide high quality paint films
with better transfer efficiency compared to air-atomizing guns.
However, due to its highly turbulent spray pattern, transfer
efficiency is still not ideal, i.e. some portion of paint will not
reach intended target surfaces and becomes overspray.
Numerical simulation of the electrostatic spraying process
provides a tool to model this process as well as a way to
optimize transfer efficiency.
Currently, the state-of-the-art simulation model can
simulate the flying trajectories of paint droplets from the edge
of the rotating bell cup to the target surfaces. It requires some
input information to start the simulation. The input information
includes paint droplet size, velocity, and charge-to-mass ratio.
Due to its large number of droplets, distributions based on
droplet diameters are used to represent the entire droplet
population.
This paper describes experimental and mathematical
methods to measure and calculate paint droplet size, velocity,
and charge-to-mass ratio distributions. The resulting
information can then be organized and used as the input data
files for Electrostatic spray painting simulation. 德国LaVision PIV/PLIF粒子成像测速场仪 阴影法激光粒径分析仪 三维立体PIV
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