軸流圧縮機の流入条件および翼端隙間の大きさの違いによる失速初生形態への影響

抄録

The effect of inflow condition and rotor tip clearance size on the stall inception in an axial compressor is experimentally investigated. The rig in this research is a low-speed, single-stage flow compressor, which has two types of tip clearance: design clearance (DC, ε = 0.5 %) and wide clearance (WC, ε = 2.2 %). The experiment is conducted in the different inflow conditions: the clean inflow and the distorted inflow. The rotor configuration is the forward-swept blade (Sweep). The stall inception is detected by applying a discrete special Fourier series analysis to the wall pressure trace data in front of the rotor blade. At the clean inflow condition, the type of the stall inception is modal-spike, regardless of the clearance size. On the other hand, at the distorted inflow condition, the type of stall inception of DC is modal-spike, and that of WC is spike. It seems that the difference of the stall inception between clearance sizes at distorted inflow condition is influenced by the circumferential distribution of the blade loading at tip region.