Impact of adjustable stator on flow capacity of variable cycle split fans at low and middle rotating speed
The adjustable stator plays a crucial role in enhancing the flow capacity of variable cycle split fans at low and middle speed.Numerical simulations are conducted to investigate the impact of the inlet guide vane(IGV)and stator regulation on the maximum flow capacity of variable cycle split fans in two configurations:"2+1"and"1+2".The results show that the maximum flow capacity of the"1+2"variable cycle split fans is stron-ger when the bypass ratio and adjustable stator are adjusted at the same time.When the bypass ratio is fixed at 0.3,the maximum flow capacity of the"2+1"variable cycle split fans is stronger.Further analysis shows that the adjustment angle of IGV determines the position of the massflow-pressure ratio characteristic line of the first stage fan,which determines the theoretical maximum flow capacity of the fans.The adjustment angle of all adjust-able stator vanes determines the matching state of the first stage fan and the subsequent stage fan,which deter-mines the maximum flow state of the first stage fan on its own characteristic line,and then determines the actual maximum flow capacity of the fans.Under the combined regulation of bypass ratio and adjustable stator,the avail-able adjustment angle of the IGV of"1+2"variable cycle split fans is larger,so its maximum flow capacity is stronger.The maximum flow capacity of variable cycle split fans is determined by the initial matching state of each stage when the bypass ratio remains fixed.For the two configurations of variable cycle split fans studied in this paper,when the bypass ratio is 0.3,the matching state of"2+1"variable cycle split fans at each stage is more conducive to obtain a larger available adjustment angle of the IGV,so its maximum flow capacity is stronger.
NETL
NSTL
万方数据
