INVESTIGATION OF A HIGH-PRESSURE-RATIO EIGHT-STAGEnAXIAL-FLOW RESEARCH COMPRESSOR WITH TWO TRANSONIC INLET STAGESⅤ- PRELIMINARY ANALYSIS OF OVER-ALL PERFORMANCE OF MODIFIED COMPRESSOR

摘要

An investigation of the over-all performance of a modified eight-stage axial-flow compressor was conducted as part of the investigation of the problems encountered in a high-pressure-ratio axial-flow compressor with transonic inlet stages.nThe investigation was made over, a range of weight flows at equiva¬lent speeds from 30 to 110 percent of design speed. The maximum total-pressure ratio obtained at design speed was 11.0 at an equivalent weight flow of 70.9 pounds per second with an adiabatic efficiency of 0.81. A maximum equivalent weight flow of approximately 72.5 pounds per second (30.6 lb/(sec)(sq ft of frontal area) was obtained at design speed. A peak efficiency of 0.67 was obtained at 30 percent of design speed, and as the compressor speed increased, a maximum peak efficiency of approxi¬mately 0.85 was obtained at 90 percent design speed. The predicted val¬ues of over-all total-pressure ratio and weight flow agree very well with -the experimental values obtained at 90 and 100 percent of design speed, while the measured efficiencies at these speeds are 3 to 4 percentage points lower than the predicted values.