基于非定常喷气的压气机模型及模态控制

以定常喷气下的多维压气机系统模型为基础,考虑引入非定常喷气带来的质量和动量效应,建立了非定常喷气下的多维压气机系统模型；分析了压气机主动稳定模态控制机理,并在上述模型基础上设计了非定常喷气下的模态控制律。以某压气机为例,在失速工况下,分别进行无喷气开环性能和非定常喷气下模态控制仿真。结果表明:与定常喷气模态控制相比,采用非定常喷气进行模态控制,流量仅为定常喷气的57%~80%,即可达到相同的控制效果,可有效减少喷气控制的流量,并且前4阶模态控制可以扩展压气机稳定工作范围达2.34%；控制模态越多,扩稳范围越大。 

Compressor model and modal control based on unsteady air injection

Based on the multidimensional compressor model with steady air injection, and in consideration of the mass and momentum effects and the unsteady influence introduced by the unsteady flow, the multidimensional compressor model with unsteady air injection was established. The principle of compressor modal control was analyzed, and modal control law using unsteady air injection was derived. Taking an axial compressor as example, modal control with different modes were simulated under stall condition. It indicates that using unsteady air injection, the same effect is achieved with only 57%-80% injected mass flow compared with steady and continual air injection, the extended stability range reaches 2.34% with the first four mode control, and also the stability range extends with the increment of mode number controlled.