Stage-by-stage poststall compression system modeling technique

A one-dimensiona l, stage-by-stag e axial compression system mathematical model has been constructed that can describe system behavior during poststall events such as surge and rotating stall. The model uses a numerical technique to solve the nonlinear, compressible conservation equations of mass, momentum, and energy. Inputs for blade forces and shaft work are provided by a set of quasi-steady stage characteristics modified by a firstorder lagging equation to simulate dynamic stage characteristics. The model was operationally verified using experimental results for a three-stage, low-speed compressor. Using the model, two studies were conducted: one to determine the effect of heat transfer due to rapid system transients on poststall system behavior, and the other to determine the effect of a possible design modification on overall system behavior. Results from these studies demonstrate the use of this modeling technique in studies of compression system poststall behavior.

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