Large double-circulation air refrigeration ejection heat exchange type low-temperature environment wind tunnel

Abstract

The invention discloses a large double-circulation air refrigeration ejection heat exchange type low-temperature environment wind tunnel, which comprises a wind tunnel and a refrigeration system, wherein the wind tunnel is an annular channel, a test section is arranged in the wind tunnel, the test section is used for carrying out a wind tunnel test on a test piece, the refrigeration system comprises an expansion machine, normal-pressure air is cooled by the expansion machine and then is sprayed into the wind tunnel through using an air inlet pipeline of the wind tunnel, an exhaust port is formed in the wind tunnel, and an exhaust valve is arranged at the exhaust port. According to the large double-circulation air refrigeration ejection heat exchange type low-temperature environment wind tunnel, air is utilized to do work for refrigeration, and a refrigerant is easy to obtain, non-toxic and harmless, so that the wind tunnel operation cost is reduced, and the wind tunnel test time is prolonged.

Description

technical field [0001] The invention relates to the technical field of low-temperature environment simulation, in particular to a large-scale double-circulation air refrigeration injection heat exchange type low-temperature environment wind tunnel. Background technique [0002] China is the country with the highest popularity of high-speed trains in the world, but due to the lack of test equipment, the overall aerodynamic test of large-scale high-speed trains in my country only stays in calculation simulation and scale-down test. In order to develop, it is urgent to establish a large-scale high Reynolds number wind tunnel to provide test support for high-speed trains. Since it is difficult to provide a real high wind speed environment in the laboratory, according to the similarity criterion, the air temperature in the wind tunnel is reduced, and the Reynolds number is increased to make it the same as the real high-speed environment Reynolds number, so as to achieve the same t...

AI Technical Summary

Problems solved by technology

However, the existing wind tunnels usually use liquid nitrogen refrigeration when preparing low-temperature gas. The acquisition of liquid nitrogen itself is difficult and expensive, and the transportation and storage of liquid nitrogen are limited, which limits the running time of the wind tunnel. Nitrogen-cooled wind tunnels have high operating costs and short test times

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