Simulation of Radial Flow Generated by Rotating a Set of Screens and Disks

Abstract

  The generation of radial gas flow by rotating a set of screens radiating in all directions while also rotating a combination of radial screens and disks perpendicular to the axis was investigated by Monte Carlo simulation. The results were as follows: a) Radial flow is effectively enhanced by rotating the set of screens with a velocity ratio rω/<υ> of greater than 2, where <υ> is the mean velocity of the gas molecules and rω is an additional circumferential velocity due to rotation. Moreover, the compression ratio becomes greater than 10⁶ when the velocity ratio is greater than 3. b) The special combination of parallel disks and radial screens has both a large pumping efficiency greater than 0.5 and a large compression ratio greater than 10⁵ with a velocity ratio of 3.