Low-temperature wind tunnel system

Abstract

The invention relates to a low-temperature wind tunnel system. The system includes: a refrigeration device configured to generate a cryogenic gas, a gas pipeline provided with a test section, an atomization spraying device, and an airflow driving device configured to drive the air in the air conveying pipeline to advance to the test section by utilizing the low-temperature air generated by the refrigerating device, wherein the airflow driving device is an ejector, the refrigerating device generates low-temperature gas through air circulation refrigeration, the low-temperature gas serves as a main flow of the ejector to be fed into the ejector, air in the air conveying pipeline is driven to advance to the test section along the air conveying pipeline and is mixed with air in the air conveying pipeline, so that the temperature of the test section is reduced. By adopting the low-temperature wind tunnel system, the adverse effect of freezing on an airflow driving device in the wind tunnelsystem can be effectively avoided, and the working stability of the wind tunnel system is effectively ensured.

Description

technical field [0001] The invention relates to the technical field of simulation tests for low-temperature environment chambers such as ice wind tunnels or low-temperature wind tunnels, and more particularly, the invention relates to a low-temperature wind tunnel system. Background technique [0002] Aircraft icing is the main meteorological factor leading to aircraft accidents. Therefore, the flight airworthiness regulations of various countries (including CCAR25 in my country and FAR25 in the United States) regard aircraft icing as an important airworthiness regulation. From the perspective of scientific research, aircraft icing is a crystallization process in a strong convective environment, and it is the intersection of aircraft aerodynamics and condensed matter physics. Therefore, countries around the world have carried out extensive research on the mechanism and impact of aircraft icing , which uses the icing wind tunnel to study the aircraft icing problem on the grou...

AI Technical Summary

Problems solved by technology

In this way, since the surface temperature of the heat exchanger is significantly lower than the freezing point, the surface of the heat exchanger will be frosted and frozen, which will affect the heat exchange efficiency and airflow temperature control

At the same time, the components of the ice wind tunnel body will also freeze due to the liquid water in the wind tunnel, which will have a great impact on the flow characteristics of the wind tunnel, increase resistance, affect the airflow profile, and then affect the quality of the flow field, and even the temperature of the tunnel body, Pressure, flow rate, etc. are difficult to maintain balance and cannot be controlled, causing the wind tunnel to be shut down. Therefore, anti-icing is one of the issues that must be considered in the design of the icing wind tunnel system

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