车用增压器涡轮的超速可靠性增长研究

针对某型车用增压器涡轮存在的超速可靠性不高的问题，分析涡轮超速破坏应力与失效危险部位，运用涡轮超速破坏可靠度计算模型对原涡轮的超速可靠性进行评价。在此基础上，从结构优化的角度出发，研究涡轮的可靠性增长措施。根据改进后涡轮的超速应力与强度参数，研究改进后涡轮的超速可靠性，分析涡轮的超速可靠性增长效果，并通过涡轮增压器结构耐久性考核试验进行定性试验验证。研究结果表明，改进后的涡轮超速可靠性明显提高，能够满足涡轮增压器的使用要求。

Study on Reliability Growth of Turbine of Turbocharger for Vehicle Applications with Over-speed Failure Mode

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.