By searching and analyzing articles related to the nature of vortex tube refrigeration , we simulated the velocity and temperature distribution of the nozzle vortex tube. The data results show that the actual flow field in the vortex tube consists of axial, radial and vortex motion, and its flow shape is Aki in the axial direction. Meade spiral is a forced vortex-free vortex model in cross section; the separation of fluid energy in the tube mainly occurs near the vortex chamber area, and after the gas comes out of the nozzle, a small amount directly enters the cold end hole to mix with the cold air flow, thus Affects the refrigeration efficiency of the vortex tube.

The vortex tube does not have any movable parts, has a simple structure, and can generate cold air quickly. It only needs to be supplied with compressed air, making it a very wide application prospect in fields with special cooling or heating requirements. The working feature of being driven not by electricity but by compressed gas is especially suitable for mines. At present, heat damage in coal mines in my country is becoming increasingly prominent. The vortex tube refrigeration system combined with underground pneumatic fans can provide an additional option for local cooling underground. The mining pneumatic fans of Xuzhou Fan Factory are driven by 0.6MPa compressed air underground. The required working pressure of the pneumatic fan motor is 0.2MPa. The current pressure reduction of 0.6 to 0.2MPa is controlled by the pressure reduction valve. If this part of the pressure is used for refrigeration, the effect of killing two birds with one stone can be obtained.

A full understanding of the flow field and temperature field inside the vortex tube is of great significance for revealing the deep physical mechanism inside the vortex tube. However, the energy separation phenomenon inside the vortex tube is extremely complex, and there is still no theory that can explain its energy separation mechanism. Theoretical analysis is necessary. In recent years, computational fluid dynamics has been widely used in the numerical simulation of various flow fields and temperature fields. The use of numerical simulation methods can more systematically and deeply study the complex flow and energy separation effects in vortex tubes.

Summarize

1. The total refrigeration capacity of the vortex tube is always higher than the refrigeration efficiency of the sole use of throttling effect refrigeration;

2. The actual flow field in the vortex tube consists of axial, radial and vortex motions. Its flow shape is an Archimedean spiral in the axial direction and a forced vortex-free vortex model in the cross section;

3. The separation of fluid energy in the vortex tube mainly occurs near the vortex chamber area, and after the gas comes out of the nozzle, a small amount directly enters the cold end hole to mix with the cold air flow, thus affecting the refrigeration efficiency of the vortex tube.