Structural Design And Flow Field Analysis On High-low Temperature Environment Test Chamber

Space environment simulation experiment inside a high-low temperature environment test chamber is an important approach to ensure spacecraft safety and reliability.The experiment system involved in this paper generally includes high-low temperature test chamber,heating and cooling source supply sub-system,circulation sub-system,control module,etc.Among them,high-low temperature environment test chamber is a crucial part.Built as thermal envelope of test environment,the test chamber is designed not only to bear fierce alternate thermal change but also to undertake various mechanical loads generated by essential equipment and experiment samples.Moreover,there are strict requirements for temperature and flow field inside the chamber,such as temperature uniformity,airflow performance.From above,it can be inferred that structural design and flow field analysis of high-low temperature environment test chamber are of great importance to space environment simulation experiment.In this paper,the design and optimization of high-low temperature environment test chamber were studied in detail based on specific experimental requirements.Also,the temperature field and air flow characteristic in the experimental chamber was investigated and optimized.First,structural design of the experimental chamber was carried out.Weak-connection form was used to connect inner frame and outer frame of the chamber.The thermal insulation was achieved by filling multilayer insulation materials into the space between two frames.The switching platform was hung in air by multiple stainless poles,which were fixed in the outer frame of the chamber through the ceiling to suspend the load generated by solar panels and other devices.The ground supporting platform was well modularized.Stainless cubic frame was used to support orifice plate to undertake ground load as well as to form the bottom plenum chamber.Secondly,the analysis and optimization on the inner frame,switching platform and ground supporting platform were carried out in this paper.The rectangular corrugated plate with good rigidity was employed in inner frame through numerical calculation.The influence of ground support platform layout and orifice plate parameters on the platform mechanical properties and system ventilation efficiency were also examined.In addition,the thermal insulation performance of the experimental chamber was calculated and the dynamic thermal load and static thermal load of the experimental chamber was also evaluated.Then the air supply method with orifice plate was determined.Finally,the effect of orifice plate on the temperature and flow field was carried out through CFD simulation.The simulation results showed that the requirements of experiment conditions were achieved with orifice plate.Moreover,the uniformity and stability of temperature and flow field were improved.The results of temperature field and air flow characteristic adapts well in the temperature range between-120? and +170?.