Acoustic method for measuring characteristics of rotating stall in a compressor

According to an analysis of the characteristics of frequency and propagation of sound generated by the rotating stall, an acoustic measuring method is developed, in which the characteristic parameters, such as the number and propagation speed of stall cells, are measured. Compared with existing methods, this method is a noncontact measurement so as to avoid disturbing the flow field. The primary experimental results obtained on a transonic axial-flow compressor facility demonstrate the feasibility of this method.