Large-scale circulating refrigeration ejection heat exchange type low-temperature environment wind tunnel

Abstract

The invention discloses a large-scale circulating refrigeration ejection heat exchange type low-temperature environment wind tunnel, which comprises a wind tunnel and an exhaust valve, wherein the wind tunnel is a closed annular channel, a cross section matrix type sprayer and a draught fan are arranged in the closed annular channel of the wind tunnel; a test section is arranged in the wind tunnel, and the test section is used for performing a wind tunnel test on a test piece; the cross section matrix type sprayer is communicated with an air inlet pipeline; and the draught fan can drive air inthe wind tunnel to flow circularly, a refrigerating gas can be mixed with the air in the wind tunnel, an exhaust port is formed in the wind tunnel and communicated with a circulating pipeline, the exhaust valve is arranged on the circulating pipeline, an air inlet end of the exhaust valve is communicated with the exhaust port, and an air outlet end of the exhaust valve is communicated with the air inlet pipeline. According to the large-scale circulating refrigeration ejection heat exchange type low-temperature environment wind tunnel, simulation of a low-temperature high-speed wind tunnel environment can be realized, and redundant gas in the wind tunnel can be recycled, so that the energy utilization rate is remarkably improved, the resistance in the wind tunnel is reduced, the volume andoccupied space of the wind tunnel are reduced, and the purposes of energy conservation, emission reduction and construction and maintenance cost reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of low-temperature environment simulation, in particular to a large-scale circulation refrigeration injection heat exchange type low-temperature environment wind tunnel. Background technique [0002] Existing low-temperature and high-speed wind tunnels generally use fans to drive and heat exchangers to cool down to provide a test environment. Although this method can reduce the air temperature in the wind tunnel, it is not suitable for large-scale equipment (such as high-speed train) tests. For large-scale wind tunnels, the required heat exchange area is very large, resulting in a large overall volume of the heat exchanger, which brings negative factors such as excessive resistance and large heat capacity. In order to make up for the resistance brought by the heat exchanger, the wind tunnel needs a larger fan to provide driving force, and the large fan itself is huge in size, and its heat capacity and heat g...

AI Technical Summary

Problems solved by technology

[0002] Existing low-temperature and high-speed wind tunnels generally use fans to drive and heat exchangers to cool down to provide a test environment. Although this method can reduce the air temperature in the wind tunnel, it is not suitable for large-scale equipment (such as high-speed train) tests. For large-scale wind tunnels, the required heat exchange area is very large, resulting in a large overall volume of the heat exchanger, which brings negative factors such as excessive resistance and large heat capacity.

In order to make up for the resistance brought by the heat exchanger, the wind tunnel needs a larger fan to provide driving force, and the large fan itself is huge in size, and its heat capacity and heat generation also need to increase the heat exchange area of ​​the heat exchanger. Make up for it, so that the heat exchanger and the fan become mutually restrictive factors, and there are great limitations in the provision of the test environment in the wind tunnel

At the same time, in order to offset the large heat capacity of large fans and heat exchangers, it is necessary to provide more cooling capacity for the wind tunnel, which makes the specification requirements of refrigeration equipment higher, and large fans and heat exchangers consume a lot of cooling energy. The energy utilization rate of the system is very low

In addition, the use of large heat exchangers and fans will increase the size of the air flow channel in the wind tunnel, resulting in an increase in the overall area of ​​the wind tunnel structure, which not only increases the difficulty of manufacturing, but also consumes a lot of insulation materials

Moreover, in order to maintain the stability of the gas pressure in the wind tunnel, an exhaust valve is often set to discharge the excess gas, which causes waste of cooling capacity and further reduces the energy utilization rate.

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