On the Impact of Condensation and Liquid Water on the Radial Turbine of a Fuel Cell Turbocharger
| Autor: | Tim Wittmann, Sebastian Lück, Christoph Bode, Jens Friedrichs |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Control and Optimization
ddc:629 ddc:629.1 Mechanical Engineering Industrial and Manufacturing Engineering Article radial turbine turbocharger fuel cell condensation water droplet erosion Euler–Lagrange Control and Systems Engineering Computer Science (miscellaneous) ddc:6 Veröffentlichung der TU Braunschweig radial turbine -- turbocharger -- fuel cell -- condensation -- water droplet erosion -- Euler–Lagrange ddc:621 Electrical and Electronic Engineering ddc:62 Publikationsfonds der TU Braunschweig |
| Zdroj: | Machines : Special Issue High Speed Air Compressor for a Fuel Cell System for Use in a Vehicle 10 (2022) 11, 1053.-https://doi.org/10.3390/machines10111053--http://www.mdpi.com/journal/machines--http://www.bibliothek.uni-regensburg.de/ezeit/?2704328--2075-1702 Machines; Volume 10; Issue 11; Pages: 1053 |
| DOI: | 10.3390/machines10111053 |
| Popis: | The air-management system of a proton exchange membrane fuel cell (PEMFC) is responsible for supplying the fuel cell stack with ambient air at appropriate conditions. The compressor of the air-management system can be partly driven by utilizing the fuel cell exhaust gas in a turbine. The fuel cell exhaust is partially or fully saturated with water vapor. When the exhaust gas is expanded in the turbine, supersaturation occurs. This leads to the nucleation of droplets and their subsequent growth by condensation. This study provides an overview and understanding of the various phenomena caused by condensation and liquid water in the turbine of a PEMFC air-management system. The basis for this work is previously published numerical simulations that focused on individual aspects of the above phenomena. The present work revisits these results and puts them in context to provide a comprehensive understanding. Important phenomena are the effects of condensation on turbine performance through phase change losses, release of latent heat and thermal throttling. In addition, the released latent heat offers a power potential for downstream turbine stages. Through these effects, condensation can also impact the entire air-management system. However, condensation may occur unevenly, causing a circumferential asymmetry of the turbine outflow. Liquid water in the turbine can lead to droplet erosion, corrosion, and water-induced damage. In summary, it is essential to consider condensation and liquid water when developing turbines for PEMFC air-management systems. |
| Databáze: | OpenAIRE |
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