PREDICTION OF COMPRESSOR STALL FOR DISTORTED AND UNDISTORTED FLOW BY USE OF A MULTISTAGE COMPRESSOR SIMULATION ON THE DIGITAL COMPUTER

摘要

A simulation technique is presented for the prediction of compressor stall for axial-flow com¬pressors for clean and distorted inlet flow. The simulation is implemented on the digital computer and uses stage stacking and lumped-volume gas dy¬namics . The resulting nonlinear differential equations are linearized about a steady-state op¬erating point, and a Routh-Hurwitz stability test is performed on the linear system matrix. Par¬allel compressor theory is utilized to extend the technique to the distorted inlet flow problem. The method is applied to the eight.-stage J85-13 compressor. Analytical stall prediction for the undistorted stall line shows good agreement with experimental results. The predicted stall line for distorted inlet flow is in agreement with ex¬perimental results only for large distortion ex¬tents and/or low distortion levels. Results for low distortion extents and high distortion level do not agree with experimental results.