Dl. Gysling et Em. Greitzer, TURBOMACHINERY COMMITTEE BEST 1994 PAPER AWARD - DYNAMIC CONTROL OF ROTATING STALL IN AXIAL-FLOW COMPRESSORS USING AEROMECHANICAL FEEDBACK, Journal of turbomachinery, 117(3), 1995, pp. 307-319
Dynamic control of rotating stall in an axial flow compressor has been
implemented using aeromechanical feedback. The control strategy devel
oped used an array of wall jets, upstream of a single-stage compressor
, which were regulated by locally reacting reed valves. These reed val
ves responded to the small-amplitude pow-field pressure perturbations
that precede rotating stall. The valve design was such that the combin
ed system, compressor plus reed valve controller, was stable under ope
rating conditions that had been unstable without feedback. A 10 percen
t decrease in the stalling pow coefficient was obtained using the cont
rol strategy, and the extension of stable flow range was achieved with
no measurable change in the steady-state performance of the compressi
on system. The experiments demonstrate the first use of aeromechanical
feedback to extend the stable operating range of an axial flow compre
ssor, and the first use of local feedback and dynamic compensation tec
hniques to suppress rotating stall. The design of the experiment was b
ased an a two-dimensional stall inception model, which incorporated th
e effect of the aeromechanical feedback. The physical mechanism for ro
tating stall in axial pow compressors was examined with focus on the r
ole of dynamic feedback in stabilizing compression system instability.
As predicted and experimentally demonstrated the effectiveness of the
aeromechanical control strategy depends on a set of nondimensional co
ntrol parameters that determine the interaction of the control strateg
y and the rotating stall dynamics.