Multi-Hole Gasoline Direct Injection: In-Nozzle Flow and Primary Breakup Investigated in Transparent Nozzles and with X-Ray

Bornschlegel S, Conrad C, Durst A, Wensing M (2017)


Publication Language: German

Publication Type: Conference contribution, Conference Contribution

Publication year: 2017

Event location: Ludwigsburg DE

Abstract

The contribution describes the flow field inside modern GDI nozzles and sprays. Starting from the internal nozzle flow results from transparent real size nozzles are shown, where a significant vapor fraction even for cold fuel conditions is proven. Based on vapor fraction inside the nozzle, evidence for (super-)sonic flow conditions inside the nozzle is shown.

The nozzle outlet velocity is determined by means of X-Ray structure tracking velocimetry, which is a very powerful measurement technique to gain access to the very dense spray at the nozzle outlet. The X-ray velocities are compared to values that are determined by means of optical -- PDA/LDA and Schlieren imaging -- measurement techniques.

By extrapolating the maximum droplet velocities found by LDA/PDA in the more downstream regions of the spray to the nozzle outlet region very similar velocities to the one derived from the X-Ray measurements close to Bernoulli velocity are evaluated for typical GDI engine conditions. A third access to the nozzle outlet velocity is given by the derivation of penetration curves. The combination of vapor fractions and outlet velocities provides a measure for the inertial spray momentum.

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How to cite

APA:

Bornschlegel, S., Conrad, C., Durst, A., & Wensing, M. (2017). Multi-Hole Gasoline Direct Injection: In-Nozzle Flow and Primary Breakup Investigated in Transparent Nozzles and with X-Ray. In Tagungsband Motorische Verbrennung - Aktuelle Probleme und moderne Lösungsansätze. Ludwigsburg, DE.

MLA:

Bornschlegel, Sebastian, et al. "Multi-Hole Gasoline Direct Injection: In-Nozzle Flow and Primary Breakup Investigated in Transparent Nozzles and with X-Ray." Tagungsband Motorische Verbrennung - Aktuelle Probleme und moderne Lösungsansätze, Ludwigsburg 2017.

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