An investigation of surge was conducted by using a parallel compressor model of the J85-13 compressor implemented on an analog computer. Surges were initiated by various types of dynamic disturbances in inlet pressure. The results provide insight into the sensitivity of the compressor to unsteady distortion and the manner in which inlet pressure data should be treated for experimental distortion analysis. The compressor model was less sensitive to disturbances of short duration, high frequency, and long duration where the compressor dis¬charge pressure could react. Adding steady distortion to dynamic disturbances reduced the amount of dynamic disturbance required to effect surge. Steady and unsteady distortions combined linearly to reduce surge margin.
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