自制航空发动机VBV防喘系统模拟教学实验台

A self-made simulation teaching test bench of aero-engine VBV anti-surge system

航空发动机喘振是气流失稳的一种严重表现,直接威胁到飞行安全。为了辅助专业课程教学,将这一个抽象的物理现象形象地演示出来,设计和构建了航空发动机VBV防喘系统教学模拟实验台。依据VBV实物的工作原理,模拟航空发动机的压气机进出口压力的变化,通过GC30传感器采集这些信号,并送到事先写入控制程序的芯片MSP430中,当气体信号触发阀值时微处理器将自动发出作动舵机的命令,打开放气活门,实现模拟航空发动机喘振时VBV打开防喘的过程。反之,放气活门自动关闭。通过LabVIEW软件显示,实验台模拟VBV系统可行。

Surge is one of terrible flow field instabilities for aero-engine,it threats to the flight safety.To aid major courses teaching,and to demonstrate visually abstract physical phenomenon,a teaching simulation bench of VBV anti-surge system is designed and constructed.Depending on real VBV system,this article describes how to simulate compress variation at import and export of compressor of aero-engine,pick up these signals by a GC30 sensor,and deliver these signals to an MSP430 chip with a control program.When air signal triggers threshold microprocessors,it will automatically send actuation servo commands,and open the bleed valve.Finally,it realizes the simulated aircraft engine surge,the VBV opens to remove surge,and vice versa.The obtained results by LabVIEW software show that this test bench of the VBV system simulation is feasible.