Stall and Surge Characteristics of a Two-Volume Compression System

Observations of the Growth and Decay of Stall Cells during Stall and Surge in an Axial Compressor

“…The surge case shows a larger decrease in plenum pressure rise and mass flow compared to the stall case. The larger decrease produces a large enough return swing during the recovery to surpass the critical recovery value of / [11]. The critical recovery value of / is shown as the black line in Figure 11(c).…”

“…A black dashed line connects the last stable prestall point to the initial stall point. The rotating stall branch of the steady-state compressor characteristic below the value of / = 0.29 was approximated using data at lower speeds as discussed in Hickman and Morris [11]. This portion of the characteristic was used strictly for predictions of unsteady compressor characteristics and contains a nearly constant pressure rise as the mass flow decreases.…”

“…In his work, Greitzer found that a single nondimensional parameter, termed the parameter, was a good indicator to determine whether stall or surge would occur. Hickman and Morris [11] found that the poststall throttle point can also influence the onset of surge.…”

“…The developing stall cell produces an effective blockage of the compressor annulus. A sudden drop in pressure ratio and mass flow rate then follow [11]. Rotating stall may be present from stall inception until the surge recovery process, [14] depending on the compressor.…”

“…During the brief stall recovery process, the pressure ratio returns to its prestall value. Another stall inception event and surge cycle repeat as the stall point is reached again [11].…”