微型超高速旋转盘腔流动与换热规律研究

The flow and heat transfer laws were numerically investigated for the micro shrouded rotor-stator cavity with the ultrahigh rotational speed at the radius of 4mm and the rotational speed from 2×10⁵ to 1.0×10⁶r/min. The results demonstrate that the ultra-strong centrifugal force and centrifugal buoyancy force of micro rotor-stator cavity do not bring the different flow structure from that of conventional rotor-stator cavity. However,the viscous dissipation effect induced by the ultra-strong centrifugal force and centrifugal buoyancy force results in the heat transfer deterioration at high radius of rotor disc. Besides,the existence of shroud further enhances this phenomenon. At higher rotational Reynolds numbers and lower rotor excess temperatures,the viscous dissipation induced by the centrifugal force and centrifugal buoyancy force becomes more remarkable while the influence of shroud is relatively alleviated.