Electromagnetic valve combination-based cooling wind tunnel temperature control method

Abstract

The invention relates to an electromagnetic valve combination-based cooling wind tunnel temperature control method. According to the method, firstly, a cooling control system is used for realizing thecooling function through extruding and pushing the liquid nitrogen. The control of the injection flow is realized through controlling a switch combination of an electromagnetic valve arranged on a liquid collecting ring, and then the accurate temperature control is realized. The liquid collecting ring is provided with a liquid nitrogen injection type electromagnetic valve and a nozzle used for filling the liquid nitrogen at the same time. An electromagnetic valve component on the liquid collecting ring is composed of an upstream electromagnetic valve set and a downstream electromagnetic valveset. The upstream electromagnetic valve set is located between a compressor and a heat exchanger. The distance between the upstream electromagnetic valve set and the tail end of the compressor is about 2 meters. The distance between the downstream electromagnetic valve set and the tail end of the compressor is about 4 meters. The nozzle is arranged at the tail end of the electromagnetic valve. The liquid nitrogen injection of the corresponding flow of the nozzle is realized by controlling an electromagnetic valve switch. According to the invention, through controlling the switch combination of the electromagnetic valve, the flow rate and the injection position of an injected refrigerant are controlled. Therefore, the cooling control of the wind tunnel is realized. The method has the advantages of high control precision, good temperature uniformity, simple control and good operability.

Description

technical field [0001] The invention relates to a temperature control method of a cooling wind tunnel based on a combination of electromagnetic valves, and belongs to the technical field of wind tunnel temperature control. Background technique [0002] The continuous wind tunnel uses a compressor to provide the power source to establish the required Mach number. The continuous wind tunnel can be divided into conventional wind tunnels, low temperature wind tunnels and cooling wind tunnels according to the operating temperature range. Conventional continuous wind tunnels are equipped with heat exchanger systems, through which the temperature of the airflow in the wind tunnel can be kept stable; cooling wind tunnels and low-temperature wind tunnels are equipped with liquid nitrogen / liquid ammonia injection systems, which can expand the test of wind tunnels by reducing the airflow temperature Reynolds number range. Taking liquid nitrogen injection as an example, the operating t...

AI Technical Summary

Problems solved by technology

[0003] There are many solenoid valves in the cooling wind tunnel, and there are many ways to combine them. There is no description of the cooling wind tunnel temperature control method based on the combination of solenoid valves in the published literature and patents.

Images