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| Influences of Switching Process of Successive Turbocharging Systems on Axial Force of Booster Auxiliary Bearing and Research on Bearing Optimization |
| DOI：10.13949/j.cnki.nrjgc.2024.02.010 |
| Key Words:sequential turbo charging compressor turbine inversion of rotor axial thrust low speed surge |
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| Abstract:The variation law of the axial force of the basic supercharger during system switching was studied by the numerical simulation method， and the improved design method of the auxiliary thrust bearing was put forward. The distribution of aerodynamic parameters of key typical sections of compressor/turbine when the rotor system of the basic supercharger switched was studied by numerical simulation， and the variation law of axial force and direction of the rotor of the basic supercharger during the switching of diesel engine supercharging mode was analyzed. Then the optimization scheme of increasing bearing surface and changing bearing surface material was put forward. The results show that the axial force of the auxiliary thrust bearing of the basic supercharger turns over within 5 s， and it bears about 2 273 N reverse axial force at most， which is the key reason for the wear of the auxiliary thrust bearing during the switching process. The maximum bearing capacity is 4.8 times of that before improvement， which significantly improves the bearing capacity of auxiliary thrust bearing. After the reliability verification of the supercharger platform， rubbing phenomenon did not appear for the improved supercharger auxiliary thrust bearing in the same time duration. |
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