基于级间放气的发动机防喘控制

Research on Aeroengine Anti-surge Control Based on Interstage Bleeding

航空发动机一般会采用级间放气和导叶调节等控制措施来保障压气机的稳定工作,防止压气机喘振造成发动机损坏。对某型航空发动机的级间放气控制技术进行分析和研究,利用FADEC控制放气阀动作,控制软件预设放气调节计划,根据发动机实时状态计算合适的放气阀位置需求,通过PID控制实现阀无级调节,使放气阀在发动机整个工作过程中自动保持需求的打开位置,提高压气机喘振裕度,同时提出了喘振检测及退喘控制方法,并进行试验验证,结果表明该技术合理可行。

Aircraft engine generally uses interstage bleed and incorporation of variable stator vanes to ensure the compressor stability work and prevent the compressor suger causing damage to the engine. The interstage bleeding control method is used to improve the stability margin of axial compressor to prevent and eliminate the surge. This paper analyzed and studied the bleeding control technology of a certain type of aircraft engine, using FADEC system to control the bleed valve movement, through the bleed valve opening schedule in the software calculating the desired bleed valve position according to the real-time state of the engine. Through PID control, the valve can be adjusted without class, so that the valve can automatically keep the demand open in the whole process of engine work, improving the compressor surge margin. At the same time, the method of surge detection and control was presented. The results show that the technique is reasonable and feasible.