CCD器件用机械泵驱动两相流体回路仿真与试验

Simulation and experimental study of mechanically pumped two-phase loop for CCD

电荷耦合元件(CCD)作为航天光学遥感器的核心部件之一,其工作性能受温度影响很大,传统的热控产品难以满足大功率CCD的精密控温需求。通过仿真与试验系统研究了机械泵驱动两相流体回路(MPTL)用于CCD控温时的启动特性、运行状态、内部工质的流动及传热特性。结果表明:MPTL可以通过干度的调节来吸收冷凝器外热流和CCD工作模式的影响; MPTL的控温精度可以达到±1℃,蒸发器并联支路、蒸发器负载和冷凝器温度在一定范围内变化等均不会对系统运行稳定性产生影响,其仍可将CCD器件控制在所需温度;通过仿真与试验对比,发现仿真模型的误差在±1℃以内,验证了模型的有效性和准确度。MPTL可以很好地满足航天光学遥感器CCD的控温要求,能够保证CCD始终具有较好的温度稳定性和均匀性,且系统具有良好的运行特性和鲁棒性,其在CCD精密控温方面具有很好的应用前景。

As one of the core components of spaceflight optical remote sensor,the temperature of the charge-coupled device( CCD) will affect the working performance. Therefore,traditional thermal control products have gradually been difficult to meet the needs of high-power CCD precise temperature control. In this paper,the start-up characteristics,operation status,flow and heat transfer characteristics of internal working fluid of mechanically pumped two-phase loop( MPTL) used in temperature control of CCD are studied by simulation and test. The results show that MPTL can absorb the influence of external heat flow of condenser and working mode of CCD by adjusting quality,and the temperature control accuracy of MPTL can reach± 1℃. The parallel branch of the evaporator,the load of the evaporator and the temperature change of the condenser in a certain range will not affect the stability of the system,and the CCD can still be controlled at the required temperature. By comparing the simulation with the experiment,it is found that the error of the simulation model is within ± 1℃,which verifies the validity and accuracy of the model. MPTL can satisfy the requirement of temperature control of space optical remote sensor CCD very well. It can ensure that the CCD always has good temperature stability and uniformity,and the system has good operational characteristics and robustness. It has a good application prospect in the precision temperature control of CCD.