A diagnostic and design approach of axial compressor based on local dynamics

The vortex separate flow that exists on the wall surfaces of blade, shroud, and hub is a major source of the performance loss for the modern axial fans/compressors. To-date the principal diagnostic and redesign approaches to reducing the vortex separate loss have been based on the principal parameters such as pressure, velocity, or Mach number. The original vortex separate flow may be decreased, but a new vortex separate flow which emanates from an else area may be produced, thus the whole course of designing a high performance axial compressor becomes more slowly. This paper presents a novel diagnostic approach based on Local Dynamics, which probes into physical sources of dynamic process and is quite different from principal methods, and a design scheme incorporating new restraint conditions, which depends less on the empirical formulas or models. As examples, one transonic fan rotor is diagnosed, and another low-speed compressor is diagnose and inverse-designed. The examples show that the new approach can enhance the load capability of the axial compressor and provide the high efficiency in a relatively wide working range.