Simulating frictional losses in automotive turbocharger journal bearing
Not available
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Bachelor thesis |
| Language: | English |
| Published: |
Universiti Teknologi Malaysia
2025
|
| Subjects: | |
| Online Access: | https://utmik.utm.my/handle/123456789/41454 |
| Abstract | Abstract here |
| _version_ | 1854975077584470016 |
|---|---|
| author | Tan, Pui Yin Biona |
| author2 | Chong, William Woei Fong, supervisor |
| author_facet | Chong, William Woei Fong, supervisor Tan, Pui Yin Biona |
| author_sort | Tan, Pui Yin Biona |
| description | Not available |
| format | Bachelor thesis |
| id | utm-123456789-41454 |
| institution | Universiti Teknologi Malaysia |
| language | English |
| publishDate | 2025 |
| publisher | Universiti Teknologi Malaysia |
| record_format | dspace |
| record_pdf | Abstract |
| spelling | utm-123456789-414542025-08-21T02:34:14Z Simulating frictional losses in automotive turbocharger journal bearing Tan, Pui Yin Biona Chong, William Woei Fong, supervisor Mechanical engineering Not available Downsizing the vehicle engines using turbocharger is one of the ways to effectively reduce the fuel consumption and increase the power of internal combustion engines. However, turbochargers usually operate at high rotational speeds, up to 150,000 rpm, which makes it one of the critical components in maintaining efficient operation of turbochargers due to the undesirable frictional losses from turbocharger journal bearing. Overall, the purpose of this study is to determine the tribological properties for an automotive turbocharger journal bearing at low speeds, considering the thermal effect. A predictive tool for the turbocharger journal bearing is developed in the present study by deriving 2-dimensional Reynolds numerical solution to simulate the lubrication along the turbocharger journal bearings, operating between 20,000 rpm and 120,000 rpm. A convergence test is performed to determine the best grid system for the numerical solution. Then, the effect of heat generated by the conduction, convection and shearing of lubricant film at the journal bearing tribological conjunction is considered through integration of a reduced energy equation in the developed predictive tool. The predictive tool is then validated with measured friction power of a typical automotive turbocharger obtained from literature. Based on the analysis, there is a better correlation between the simulated friction power with thermal analysis and literature experimental data, as compared to the iso-thermal analysis. This is because the consideration of viscous shearing effect in the lubricant film causes significant rise in lubricant temperature, resulting in reduction of lubricant viscosity and power losses of turbocharger. Besides, the shape of the contact pressure distribution does not vary much with the rotational speed due to lubrication starvation at high operating speed. zulraizam UTM 72 p. Thesis (Bachelor of Engineering (Mechanical)) - Universiti Teknologi Malaysia, 2021 2025-03-10T02:55:50Z 2025-03-10T02:55:50Z 2021 Bachelor thesis https://utmik.utm.my/handle/123456789/41454 vital:153468 valet-20230927-074610 ENG Closed Access UTM Complete Unpublished Completion application/pdf Universiti Teknologi Malaysia |
| spellingShingle | Mechanical engineering Tan, Pui Yin Biona Simulating frictional losses in automotive turbocharger journal bearing |
| thesis_level | Other |
| title | Simulating frictional losses in automotive turbocharger journal bearing |
| title_full | Simulating frictional losses in automotive turbocharger journal bearing |
| title_fullStr | Simulating frictional losses in automotive turbocharger journal bearing |
| title_full_unstemmed | Simulating frictional losses in automotive turbocharger journal bearing |
| title_short | Simulating frictional losses in automotive turbocharger journal bearing |
| title_sort | simulating frictional losses in automotive turbocharger journal bearing |
| topic | Mechanical engineering |
| url | https://utmik.utm.my/handle/123456789/41454 |
| work_keys_str_mv | AT tanpuiyinbiona simulatingfrictionallossesinautomotiveturbochargerjournalbearing |