Analysis And Application Of Flow Field Characteristics Of High-low Temperature Test Chamber Based On Special Working Conditions

Although high and low temperature test chambers have been widely used in various industries,under certain special conditions,such as high voltage,high salt spray and other environments,high and low temperature test boxes need to be customized.Under this background,this article relies on the actual project needs,focusing on solving the problem of quantitative analysis and optimization of high and low temperature test cases under high voltage conditions.Aiming at the breakdown accidents in high voltage working conditions,a potting block structure was designed to solve the high voltage isolation problem.Combining the potting block with the space inside the thermostat,the overall mechanical structure of the thermostat was designed.The steady state load of the thermostat is calculated to obtain the functional relationship between temperature and load.The new structure will affect the temperature transfer of the thermostat.Therefore,the optimization of the spatial structure in the thermostat is achieved through simulation analysis and an optimal structure is obtained;On the basis of the optimal structure,quantitative analysis of the air flow is performed,and the optimal air supply scheme is obtained through the comparison of the simulation results.In order to verify the correctness of the thermostatted structure,component selection was carried out and the physical production was carried out;related experiments were carried out on the basis of physical production,and the experimental results were compared with the simulation results to verify the correctness of the entire system design.The simulation results show that when the space radius R=100mm in the incubator,the temperature field uniformity of the incubator is the best,the temperature difference range is the minimum,and the pressure difference is maintained at a low level.In the selected four kinds of air supply solutions,when the air supply speed is 1.8m/s,the uniformity of the system temperature can reach 2?,the pressure difference does not exceed 5Pa,and theuniformity and stability of the system in the transient working condition study.Degrees can all meet expected requirements.The selected solution can be applied within the range of-40? to +85?.The entire system meets the design requirements.During the simulation of other air supply schemes,the temperature difference and standard deviation of the system are both too large.After research and analysis,if the air supply speed is too small,the heat exchange in the system will be insufficient.If the air supply speed is too high,the heat loss will be too fast and the system temperature dynamic balance will not be the best.The results of continuous simulation show that under the given air supply scheme,the temperature rise rate of the system can reach 3?/min,and the temperature drop rate can reach 2?/min.The experimental results show that the system's steady-state temperature conditions and continuous experimental conditions can meet the design requirements under the optimal air-supply speed scheme;the wind speed and temperature difference satisfy the quadratic function relationship;experimental data curves and theoretical temperatures The temperature error of the rise and temperature drop function curves is basically maintained within 2?;the temperature uniformity and the flow field stability of the system all meet the design requirements.All of these provide theoretical and data support for the testing of subsequent electronic devices to facilitate further in-depth research.