Peter A, Rieß S, Weiß L, Braeuer AS, Wensing M, Klima TC (2018)
Publication Type: Conference contribution
Publication year: 2018
Publisher: ILASS � Europe, Institute for Liquid Atomization and Spray Systems
Conference Proceedings Title: ICLASS 2018 - 14th International Conference on Liquid Atomization and Spray Systems
The mixture formation process of high-pressure diesel sprays is based on momentum transfer between the injected fuel and the surrounding ambient gas. The process can be characterized by fuel and ambient density and injector nozzle geometry. In spite of an available fundamental description via macroscopic spray parameters like liquid length, spray cone angle and the distinction between gaseous and liquid phase, quantitative experimental investigations of the mixing process are quite rare. In this work, we provide such quantitative results characterizing the mixing behavior with Raman spectroscopy. Variations of injection pressure and injected fuel are examined in a constant pressure combustion chamber under typical diesel engine conditions up to 6 MPa and 923 K. The injection pressure is varied in the range from 40 to 120 MPa and the mass concentration is measured at five different locations between 2.8 and 28.3 mm distance to the nozzle orifice. Additionally, the applied quantification method is described in detail. The results show an equal mass fraction between fuel and air for different injection pressures and for all investigated fuels (GTL-diesel, decane, ethanol). The mass concentration in 2 mm distance to nozzle orifice already shows high amounts of ambient gas on the spray axis. This presumes a strong air-entrainment even into the spray root. These quantitative analyses enable a microscopic insight into the temporal and spatial process of an injection event. A further step is to expand examinations onto a molecular mixing scale to identify regions of low mixing quality and to reduce heat pockets and high emission outputs.
Peter, A., Rieß, S., Weiß, L., Braeuer, A.S., Wensing, M., & Klima, T.C. (2018). Quantitative mixture formation analysis of diesel sprays. In ICLASS 2018 - 14th International Conference on Liquid Atomization and Spray Systems. Chicago, IL, US: ILASS � Europe, Institute for Liquid Atomization and Spray Systems.
Peter, Andreas, et al. "Quantitative mixture formation analysis of diesel sprays." Proceedings of the 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018, Chicago, IL ILASS � Europe, Institute for Liquid Atomization and Spray Systems, 2018.