Rotating stall and surge: alternate modeling and control concepts

Analysis of biogas compression system dynamics

“…An energy delivery index W can be defined as in Eq. (25) to relate the compression station outlet energy delivery to the power supplied for compressing the gas.…”

“…[11] the use of pulsed air injection to control rotating stall in low speed axial flow compressors was presented and jet injection with a high order Galerkin method was studied in Ref. [25]. In Ref.…”

Active Suppression of Aerodynamic Instabilities in the Axial Flow Compressors

“…3 and according to Equ. (24), that the stability of the compression systems dependent on the throttle coefficient, (27) where o h is the new nominal value of the throttle position, 1 K is the gain which will eliminate the hysteresis between the steady axisymmetric flow and rotating stall. To increase the compressor limit of stability, substituting the modified throttle characteristic,…”

“…Rotating stall was controlled using pulsed air injection that is distributed around the annulus of the flow compressor [26]. Protz [27] and Yeung [28] have investigated air injection controllers, and Weigl et al [29], Protz [30], D'Andrea et al [31] have carried out successful experiments. However, most of the control-oriented studies published during the last decade employ simplified versions of an ordinary partial differential equation compressor model by Moore and Greitzer [3] because of its remarkable ability to qualitatively describe and predict compressor operation.…”