CN-122009499-A - Light mixed working medium for liquid metal strong precooling system and preparation method thereof

Abstract

The application discloses a light mixed working medium for a liquid metal strong precooling system and a preparation method thereof, relating to the technical field of aircrafts and aiming at solving the problem of larger weight of the strong precooling system. The light mixed working medium comprises liquid metal of a continuous phase and a light phase dispersed in the liquid metal, wherein the density of the light phase is smaller than that of the liquid metal, the chemical property of the light phase is stable, and the volume fraction of the light phase in the mixed working medium is 5-50%.

Inventors

• ZHOU KUN
• WEI KUAN
• MIAO HUI
• LI YAZHONG

Assignees

• 中国航空发动机研究院

Dates

Publication Date

20260512

Application Date

20260127

Claims (14)

1. 1. The utility model provides a light mixed working medium for liquid metal strong precooling system which characterized in that, light mixed working medium includes: Liquid metal in continuous phase, and A light phase dispersed within the liquid metal; The density of the light phase is smaller than that of the liquid metal, the chemical property of the light phase is stable, and the volume fraction of the light phase in the light mixed working medium is 5% -50%.
2. 2. The light-weight mixed working medium according to claim 1, wherein the light-weight phase is solid particles or liquid.
3. 3. The light-weight mixed working medium according to claim 2, wherein the solid particles are one or more of micron-or nano-sized ceramic particles, polymer microspheres and cenospheres.
4. 4. The light-weight mixed working medium according to claim 3, wherein the ceramic particles comprise one or more of silica ceramic particles, alumina ceramic particles and zirconia ceramic particles, and/or, The polymeric microspheres include organic polymeric microspheres, and/or, The hollow micro beads comprise hollow glass micro beads.
5. 5. The light-weight mixed working medium according to claim 2, wherein the particle size of the solid particles is in the range of 1 μm to 100 μm.
6. 6. The light-weight mixed working medium according to claim 2, wherein the liquid is one or two of an organic solvent and an inert liquid, a two-phase suspension system is formed between the liquid and the liquid metal, the chemical property of the liquid is stable, and the viscosity of the liquid is not more than that of the liquid metal.
7. 7. The light mixed working medium according to claim 6, wherein the organic solvent comprises one or both of silicone oil and mineral oil, and the inert liquid comprises a perfluoropolyether fluorinated liquid.
8. 8. The light weight mixed working medium of claim 1, wherein the liquid metal comprises one or more of gallium-based liquid metal, bismuth-based liquid metal, and mercury-based liquid metal.
9. 9. The light-weight mixed working medium according to claim 8, wherein the gallium-based liquid metal comprises one or two of gallium indium alloy and gallium indium tin alloy, and/or, The bismuth-based liquid metal comprises bismuth indium tin alloy, and/or, The mercury-based liquid metal comprises one or two of mercury and an alloy thereof.
10. 10. The light mixed working medium according to claim 8, further comprising a dispersing agent, wherein the mass fraction of the dispersing agent is 0.1% -0.5% of the light mixed working medium, and the dispersing agent is one of polyethylene glycol and a silane coupling agent.
11. 11. The light-weight mixed working medium according to claim 1, wherein when the light-weight mixed working medium is used in a liquid metal strong precooling system, the total heat transfer coefficient of the liquid metal strong precooling system is reduced by not more than 10%.
12. 12. The preparation method of the light mixed working medium for the liquid metal strong precooling system is characterized by comprising the following steps of: Providing liquid metal and a light phase, wherein the density of the light phase is less than that of the liquid metal, the chemical property of the light phase is stable, and the volume fraction of the light phase in the light mixed working medium is 5-50%; And mixing the light phase with the liquid metal to obtain a light mixed working medium.
13. 13. The method according to claim 12, wherein the dispersant is added during the mixing in a mass fraction of 0.1% -0.5%.
14. 14. The liquid metal strong pre-cooling system is characterized by comprising a pre-cooling unit, a heat dissipation unit, a power unit and a liquid storage unit which are communicated through a pipeline, wherein a magnetic stirring unit is arranged on the liquid storage unit; The system is filled with the light mixed working medium according to any one of claims 1-11.

Description

Light mixed working medium for liquid metal strong precooling system and preparation method thereof Technical Field The application relates to the technical field of aircrafts, in particular to a light mixed working medium for a liquid metal strong precooling system and a preparation method thereof. Background The liquid metal is an ideal strong precooling heat exchange working medium. However, the density of liquid metal is far higher than that of conventional cooling media, limiting the loading and range of hypersonic aircraft. Disclosure of Invention The application aims to provide a light mixed working medium for a liquid metal strong precooling system and a preparation method thereof, and aims to greatly reduce the quality of the liquid metal working medium while ensuring the heat exchange performance of the system to be basically unchanged, thereby reducing the weight of the whole strong precooling system. In order to achieve the above object, the present application provides the following technical solutions: In a first aspect, the application provides a light mixed working medium for a liquid metal strong precooling system, which comprises a continuous phase liquid metal and a light phase dispersed in the liquid metal, wherein the density of the light phase is smaller than that of the liquid metal, the chemical property of the light phase is stable, and the volume fraction of the light phase in the mixed working medium is 5-50%. In the light mixed working medium for the liquid metal strong precooling system, the light phase with the density smaller than that of the liquid metal and stable chemical property is dispersed in the liquid metal of a continuous phase in a volume fraction of 5-50%, so that a stable two-phase or multi-phase suspension system is formed, the overall average density of the mixed working medium is directly reduced, and compared with the pure liquid metal, the overall average density of the mixed working medium can be reduced by 4-40%. For example, when the light phase volume fraction reaches 40%, the working medium density may be reduced by about 30%. For a liquid metal strong pre-cooling system with the working medium mass accounting for the total weight of the system, the weight of the whole system is directly and greatly reduced, and the severe limitation of the hypersonic aircraft on the load and the voyage is effectively relieved. Second, in a typical precooler heat transfer path, the liquid metal side thermal resistance is a very small proportion of the total thermal resistance. Therefore, even if the heat conductivity of the mixed working medium itself is reduced due to the incorporation of the light phase, the influence on the total heat transfer coefficient of the whole system is extremely limited. The volume fraction of the light phase in the light mixed working medium is controlled to be 5% -50%, so that the light phase can fully exert the weight reducing effect, and the excessive weakening of the original excellent heat exchange performance of the liquid metal due to the excessively high light phase proportion is avoided by reasonably controlling the volume fraction of the light phase, so that the reduction of the total heat transfer coefficient of the system is ensured not to exceed 10%, the weight reducing benefit is obtained, and the core function of strong precooling is ensured not to be substantially damaged. Finally, as the light phase has stable chemical property and does not react with liquid metal, the risks of deterioration of working media, attenuation of heat exchange performance, corrosion of system pipelines and the like caused by chemical reaction among components are avoided, and a foundation is provided for long-term reliable operation of the mixed working media. In a second aspect, the application provides a preparation method of a light mixed working medium for a liquid metal strong precooling system, which comprises the steps of providing liquid metal and a light phase, wherein the density of the light phase is smaller than that of the liquid metal and the light phase is stable in chemical property, and mixing the light phase with the liquid metal to obtain the light mixed working medium, and the volume fraction of the light phase is 5% -50%. Compared with the prior art, the beneficial effects of the preparation method of the light mixed working medium for the liquid metal strong precooling system are the same as those of the light mixed working medium for the liquid metal strong precooling system in the technical scheme, and the description is omitted here. In a third aspect, the application provides a strong precooling system for liquid metal, which comprises a precooling unit, a heat radiating unit, a power unit and a liquid storage unit which are communicated through pipelines, wherein a magnetic stirring unit is arranged on the liquid storage unit, and the system is filled with the light mixed working medium in the first aspect. Compared with