单转子轴流压气机不同状态下进出口三维时均流场

用圆锥四孔高频压力探针测量了单转子轴流压气机不同流量状态下, 转子进出口三维时均流场。结果表明, 压气机转子进口流动沿周向呈现较强的周期性变化, 尤其在近失速状态, 叶片压力面侧总压和静压高, 吸力面侧总压和静压低, 而前缘附近轴向速度低、相对气流角大。 

Three-Dimensional Mean Flow Field at Both Inlet and Exit of an Isolated Axial Compressor Rotor Passage in Different Conditions

Detailed measurements of three dimensional mean flow field at both inlet and exit of an isolated axial flow compressor rotor passage were made in different mass flow conditions.The flow structure was surveyed with a conical four hole high frequency response pressure probe.Strong periodic circumferential distributions of flow parameters were found at inlet of the rotor passage,especially in near stall condition.Both total pressure and static pressure are higher near the blade pressure surface,but lower near the suction surface.Lower axial velocity and larger relative flow angle appeared near the leading edge.The investigation shows that in design condition,mixing between the tip leakage vortex and the endwall boundary layer are main factors of the substantial blockage and loss in the tip mid passage;as the mass flow reduces,the enhanced leakage vortex produces more flow blockage and loss,and a vortex appears at the corner between the suction surface and the casing wall;while the intensified tangential migration in the hub wall boundary layer enlarges flow blockage and loss.In near stall condition,interaction among the tip corner vortex,the leakage vortex and the endwall boundary layer deteriorates the flow and leads to larger blockage and loss,and flow separation of the boundary layer on the suction surface occurs at 0 2 span and 0 8 span respectively.