关键词: 涡轮增压器, 涡轮, 超速破坏, 可靠性, 可靠性增长

Abstract:

For the over-speed reliability problem of turbine of turbocharger for vehicle applications, the stress and critical position of turbine with over-speed failure mode were analyzed. With the reliability model of turbine with over-speed failure mode, the reliability of original turbine was evaluated. Then, through the structural optimization design, the method for reliability growth of turbine with over-speed failure mode was studied. According to the parameters of stress and strength of improved turbine, the reliability of improved turbine with over-speed failure mode was studied, and the reliability growth effectiveness of turbine was analyzed. Finally, the reliability was verified qualitatively by the structural endurance test of turbocharger in a test bench. The results show that the reliability of improved turbine with over-speed failure mode increases obviously and it can meet the operation requirements of turbocharger.

Key words: turbocharger, turbine, over-speed failure, reliability, reliability growth