Phase transition and mixing behavior of a liquid Diesel spray injected into supercritical atmosphere

Weiß L, Peter A, Rieß S, Wensing M (2016)

Publication Type: Conference contribution, Conference Contribution

Publication year: 2016

Event location: Brighton GB

Abstract

In this work combined Schlieren-Mie high speed recordings give a visual impression on the free jet penetration into nitrogen atmosphere. Due to higher charging pressures and compression ratios of modern engines the thermodynamic conditions exceed the critical points of the atmosphere and the fuel. The mixture formation under these conditions is discussed by several groups. The visual impressions of the experiments are compared to these recent spray descriptions of Qiu et al., Oefelein et al. and Wensing et al. The pivotal question is, if a 2-phase or a 1-phase mixing occurs. Global thermodynamic calculations exclude the idea of a dense liquid spray core. The spray volume is 150 times bigger than the volume of injected fuel after 50 μs. The discrepancy increases over injection duration. The maximum derived global mole fraction is < 0.02 and 10 times lower than the discussed conditions by Qiu et al. In this region Qiu’s stability analysis shows a single stable phase. This concludes, that fuel is solved rather than mixed in the supercritical nitrogen atmosphere. Therefore the fuel has not necessarily reached supercritical conditions.

Authors with CRIS profile

Lukas Weiß Professur für Fluidsystemtechnik Andreas Peter Professur für Fluidsystemtechnik Sebastian Rieß Professur für Fluidsystemtechnik Michael Wensing Professur für Fluidsystemtechnik

How to cite

APA:

Weiß, L., Peter, A., Rieß, S., & Wensing, M. (2016). Phase transition and mixing behavior of a liquid Diesel spray injected into supercritical atmosphere. In Proceedings of the ILASS – Europe 2016, 27th Annual Conference on Liquid Atomization and Spray Systems, 4-7 September 2016, Brighton, UK. Brighton, GB.

MLA:

Weiß, Lukas, et al. "Phase transition and mixing behavior of a liquid Diesel spray injected into supercritical atmosphere." Proceedings of the ILASS – Europe 2016, 27th Annual Conference on Liquid Atomization and Spray Systems, 4-7 September 2016, Brighton, UK, Brighton 2016.

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