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在现代大型民用客机上,大多采用双转子涡轮风扇发动机作为飞行动力装置。这种发动机具有推力大、经济性能高的优点,但是在发动机运转中,连接高压转子的高压压气机(HPC)与连接低压转子的低压压气机(LPC)之间常常会产生不匹配的现象,为改善HPC与LPC之间的匹配,厂商设计了可变放气活门(Variable Bleed Valve以下简称“VBV”)系统。VBV系统在发动机运转中起着至关重要的作用,它的位置关系着HPC的工作,在发动机恒速运转和加速运转过程中,它直接被VSV(Variable Compressor Stator Vanes的角形调节点控制:低转速时,低压压气机提供的压缩气流大大超过核心机
In modern large passenger aircraft, most of the dual-rotor turbofan engine as a flying power plant. Such an engine has the advantages of large thrust and high economic performance. However, during engine operation, a mismatch often occurs between a high pressure compressor (HPC) connecting a high pressure rotor and a low pressure compressor (LPC) connecting a low pressure rotor, To improve the match between HPC and LPC, the manufacturer designed a Variable Bleed Valve (“VBV”) system. The VBV system plays a crucial role in the operation of the engine. Its position is related to the work of the HPC. It is directly controlled by the VSV (Variable Compressor Stator Vanes’ angle control) during the constant speed and acceleration of the engine At speed, the compressed air flow provided by the low pressure compressor greatly exceeds the core machine