Blade profile structure of mixed-flow compressor for air separation unit

The invention relates to the field of turbomachinery, in particular to a blade profile structure of a mixed-flow compressor for an air separation unit, and aims to solve the problems that the curvature is discontinuous due to the fact that an arc front edge blade profile and an oval front edge blade profile are adopted by an existing mixed-flow compressor for an air separation unit with the grade of 100,000-200,000 cubic meters, so that the front edge has a large pressure tip, the pneumatic loss is increased, the tangential velocity is low, the power capability is poor, and the process requirement can be met by generally needing 8-10 stages of axial flow. The blade profile structure of the mixed-flow compressor comprises 4-7 stages of movable blades and stationary blades, wherein the movable blade profile is a front transition blade profile of which the transition position is within the range of 8%-12% of the axial chord length, and the front edge of the movable blade profile is a curvature-continuous front e