Abstract
One of the important technologies to improve the Reynolds number is to reduce the temperature of the air flow inside the wind tunnel. The air flow working temperature can reach 77K at least. At this time, it is necessary to carry out thermal protection for the internal equipment of the wind tunnel. In view of the complex layout and various characteristics of the equipment in the wind tunnel, this paper takes the thermal protection and temperature control strategy of the equipment in the wind tunnel as the research object, and designs the temperature control strategy of the typical equipment from the perspectives of heating element selection, temperature control logic, temperature control algorithm and heating mode. A physical test platform was designed and built. The feasibility of temperature control strategy was verified by the physical test platform under two typical temperature conditions of normal temperature and low temperature. The test results show that the comprehensive design of the temperature control strategy can meet the temperature control requirements of different shapes, heat capacities and heat leakage conditions, and the temperature control accuracy is better than 1 °C, which can meet the design requirements and effectively ensure the normal operation of the equipment in the wind tunnel.
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