Experiments have been conducted to determine the conditions that cause surging in compressors and to determine the effect of various installations and operating conditions on the character of the velocity and pressure variations occurring during surging. These investigations were made on three compressor units and the variation of static, total, or velocity pressure with time was recorded. In addition to the experimental studies, a simplified analysis was made to determine how instability of flow may occur in a compressor. An examination, "based on this analysis, was made of several possible methods of inhibiting the occurrence of surging.nSurging was found to he a periodic variation of pressures and velocities that may occur when the slope of the compressor characeristic curve is positive.
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