基于 AMESim的 直升机机载蒸发循环系统动态仿真

Dynamic Simulation of Helicopter Airborne Evaporative Cycle System Based on AMESim

摘要:

为得到直升机机载蒸发循环制冷系统性能动态变化过程,校核是否满足设计要求,文章以国内某直升机为例,基于 AMESim仿真平台搭建了制冷系统及座舱的热模型,并通过试验验证了系统的可靠性。在地面初始温度分别为 30℃、35℃、40℃、45℃、50℃时,计算得到地面与飞行两种状态下,舱内空气的温、湿度,以及系统制冷量及性能系数随时间的动态变化关系。结果表明:地面状态时,制冷系统在开机 20min后性能达到稳定,且座舱最终温、湿度分别为 27℃、60%,满足舒适性指标；在飞行状态下,系统系能受飞行高度影响较大,且海拔越高,系统性能系数越大。建立的仿真模型可以很好地预测在任务剖面下,直升机制冷系统动态变化,为系统的校核及优化提供借鉴。

Abstract:

In order to get the dynamic performance of the helicopter evaporative cycle refrigeration system to check wheth.er it meets the design requirements, based on the AMESim simulation platform, the thermal model of refrigeration systemand cockpit of a helicopter domestic was built. The reliability of the system was verified by a test. The temperature and hu.midity of the cabin air, as well as the cooling capacity and the performance coefficient of the system were calculated inbothstatesofgroundandflyingattheinitialgroundtemperatureof 30℃ , 35℃ , 40℃ , 45℃ , 50℃ ℃.Theresultsshow that the performance of the refrigeration system is stable in 20 min at ground state. The final temperature and humidity ofthe cockpit are 27 and 60% respectively, which meet the comfort index. The system can be greatly influenced by flightheight greatly at flying state. And the higher the altitude, the greater the coefficient of performance of the system. The simu.lation model can well predict the dynamic changes of the helicopter refrigeration system under the mission profile, and pro.vide reference for the verification and optimization of the system.