气候实验室环境场动态平衡调控技术研究

Study on the Dynamic Balance Control Technology of Environmental Field in Climate Laboratory

为解决气候实验室发动机低温启动试验过程中空气补偿和尾气排放的问题,利用氮蒸发制冷效应通过补偿新风的温度和补偿风机闭环调节实现室内补偿空气控制,维持实验室内低温环境稳定和室内外压力平衡。通过内、外涵尾气“分割排放”设计实现发动机排气引射量动态调控,实现对高温尾气的主动排放和背压控制。首次成功实施了民机-40℃发动机低温启动适航符合性试验,试验过程中实验室温度控制精度在±3℃以内,发动机排气背压稳定在150 Pa。该项试验的成功验证了实验室发动机开车的可行性。

To solve the problems of air compensation and exhaust emission during the low-temperature start test of the engine in the climate laboratory,the nitrogen evaporation refrigeration effect is utilized to achieve indoor compensated air control by compensating for the temperature of fresh air and closed-loop adjustment of the compensating fan,maintaining the stability of the low-temperature environment in the laboratory and the balance of indoor and outdoor pressure.The dynamic control of engine exhaust injection is realized through the design of internal and external exhaust“split emission”,and the active emission and back pressure control of high-temperature exhaust are realized.For the first time,the airworthiness test of the civil aircraft engine at-40℃is successfully carried out.During the test,the laboratory temperature control accuracy is within±3℃,and the engine exhaust back pressure is stable at 150 Pa.The success of this test verifies the feasibility of the laboratory engine start-up.