Numerical Investigation of Nozzle-Geometry Variations and Back-Pressure Changes on High Pressure Gas Injections under Application-Relevant Conditions 2018-01-1138
In the present work numerical simulations were carried out investigating the effect of fuel type, nozzle-geometry variations and back-pressure changes on high-pressure gas injections under application-relevant conditions. Methane, hydrogen and nitrogen with a total pressure of 500 bar served as high-pressure fuels and were injected into air at rest at 200 bar and 100 bar. Different nozzle shapes were simulated and the analysis of the results lead to a recommendation for the most advantageous geometry regarding jet penetration, volumetric growth, mixing enhancement and discharge coefficient. Additionally an artificial inlet boundary conditions was tested for the use with real-gas thermodynamics and was shown to be capable of reducing the simulation time significantly.
Citation: Banholzer, M., Pfitzner, M., Sakellarakis, D., Wright, Y. et al., "Numerical Investigation of Nozzle-Geometry Variations and Back-Pressure Changes on High Pressure Gas Injections under Application-Relevant Conditions," SAE Technical Paper 2018-01-1138, 2018, https://doi.org/10.4271/2018-01-1138. Download Citation
Matthias Banholzer, Michael Pfitzner, David Sakellarakis, Yuri M. Wright, Walter Vera-Tudela, Konstantinos Boulouchos
Bundeswehr University Munich, ETH Zurich