| 摘要: |
| 通过数值模拟方法研究了带周向环罩的微型超高速旋转盘腔的流动与换热规律，盘腔的半径为4mm，转速为2×105~1×106r/min。结果表明：超强离心力及其衍生浮升力并没有给微型旋转盘腔带来与常规盘腔不同的流动结构，但是超强离心力及其衍生浮升力引起的粘性耗散效应导致旋转盘高半径处发生换热恶化现象，周向环罩的存在则进一步加剧了该现象。在高旋转雷诺数和低转盘过余温度工况下，强离心力及其衍生浮升力引起的粘性耗散效应更加显著，而周向环罩的影响相对弱化。 |
| 关键词: 微型旋转盘腔 流动与换热 离心力 离心浮升力 粘性耗散 换热恶化 |
| DOI：10.13675/j.cnki.tjjs.2206024 |
| 分类号:TK311 |
| 基金项目: |
|
| Flow and Heat Transfer Laws for Micro Rotor-Stator Cavity with Ultrahigh Rotational Speed |
|
ZHAO Xi1, LIU Jian-yu2,3, QUAN Yong-kai2,3
|
|
1.AECC Guiyang Engine Design Research Institute，Guiyang 550081，China;2.National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics， Research Institute of Aero-Engine，Beihang University，Beijing 102206，China;3.Beihang Hangzhou Innovation Institute Yuhang，Hangzhou 310023，China
|
| Abstract: |
| 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. |
| Key words: Micro rotor-stator cavity Flow and heat transfer Centrifugal force Centrifugal buoyancy force Viscous dissipation Heat transfer deterioration |
