As an important parameter of compressor impeller, the design value of blade outlet backsweep angle has a great influence on the performance of impeller. In this paper, six impellers with blade outlet backsweep angle ...As an important parameter of compressor impeller, the design value of blade outlet backsweep angle has a great influence on the performance of impeller. In this paper, six impellers with blade outlet backsweep angle β<sub>2B</sub> equal to 0°, 10°, 20°, 30°, 40°, and 50° were designed to evaluate the influences of impeller backsweep angle β<sub>2B</sub> on the performance, characteristics of gas flow and equivalent stress using computational fluid dynamics (CFD) and finite element analysis (FEA). Results indicated that the performance curve for the outlet backsweep blade angle β<sub>2B</sub> of 50° has the largest stable operating range. The isentropic efficiency of the impeller with backsweep angle β<sub>2B</sub> equal to 40° is 16.8% - 25.9% higher than that of the impeller with backsweep angle β<sub>2B</sub> equal to 0°. When the blade outlet backsweep angle is 30°, the equivalent stress distribution of the impeller is more uniform, the maximum equivalent stress is the smallest.展开更多
文摘As an important parameter of compressor impeller, the design value of blade outlet backsweep angle has a great influence on the performance of impeller. In this paper, six impellers with blade outlet backsweep angle β<sub>2B</sub> equal to 0°, 10°, 20°, 30°, 40°, and 50° were designed to evaluate the influences of impeller backsweep angle β<sub>2B</sub> on the performance, characteristics of gas flow and equivalent stress using computational fluid dynamics (CFD) and finite element analysis (FEA). Results indicated that the performance curve for the outlet backsweep blade angle β<sub>2B</sub> of 50° has the largest stable operating range. The isentropic efficiency of the impeller with backsweep angle β<sub>2B</sub> equal to 40° is 16.8% - 25.9% higher than that of the impeller with backsweep angle β<sub>2B</sub> equal to 0°. When the blade outlet backsweep angle is 30°, the equivalent stress distribution of the impeller is more uniform, the maximum equivalent stress is the smallest.
