Studies of unsteady thermo-fluid mechanic devices

本研究计划的主要目的是促进对兰克-希尔施(涡流)管装置的了解和应用。涡流管是一种非常简单的、不动的气动装置，它将冷液与热液分离以达到冷却的目的。它利用压缩气体，切向注入涡流管，以建立一个强大的旋流。对于这些设备运行的物理解释，目前仍存在争议。此外，由于存在较强的涡流，装置内部流场的实验测量非常困难。最近在我们实验室进行的实验表明，冷却效应只在雷诺数与湍流一致时发生。这项工作引出了这样一个问题：让设备承受脉动的供电流是否会导致所需的能量分离。

The primary aim of this research program is to advance the state of understanding and application of Ranque-Hilsch (vortex) tube devices. The vortex tube is a very simple, non-moving part, pneumatic device that separates cold fluid from hot fluid for cooling purposes. It utilizes compressed gas, injected tangentially into the vortex tube to establish a strong swirling flow. There is still controversy over the physical explanation of the operation of these devices. In addition, experimental measurements of the internal flow field of the devices are extremely difficult due to the strong vortex flow. Recent experiments conducted, in our laboratory, show that the cooling effect only occurs at Reynolds numbers consistent with turbulence. This work leads to the question of whether subjecting the device to a pulsating supply flow would result in the desired energy separation.