Effect of fuel properties on primary breakup and spray formation studied on a gasoline 3-hole nozzle

Zigan L, Schmitz I, Wensing M, Leipertz A (2010)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2010

Event location: Brno

Abstract

The initial conditions of spray atomization and mixture formation are significantly determined by the turbulent nozzle flow. In this study the effect of fuel properties on primary breakup and macroscopic spray formation was investigated with laser based measurement techniques at a 3-hole research injector in an injection chamber. Two single-component fuels (n-hexane, n-decane), which are representative for high- and low-volatile fractions of gasoline with sufficient large differences in viscosity, surface tension and volatility were studied. Integral and planar Mie-scattering techniques were applied to visualize the macroscopic spray structures. To characterize the microscopic spray structure close to the nozzle exit a high resolving long distance microscope was used. For deeper insight into primary breakup processes with effects on global spray propagation the range of Reynolds (8,500-39,600) and liquid Weber numbers (15,300-44,500) was expanded by variation of the fuel temperature (25 °C, 70 °C) and injection pressure (50 bar, 100 bar). The spray is characterized by strong shot-to-shot fluctuations and flipping jets due to the highly turbulent cavitating nozzle flow. Significant differences in microscopic spray behavior were detected at valve opening and closing conditions, whereas during the quasi-stationary main injection phase the spray parameters cone angle and radial spray width show a plateau-trend for the different fuels. The radial spray width at the nozzle exit as well as the microscopic cone angle decrease by trend with higher Reynolds and Weber numbers at early injection phases leading to increased macroscopic spray propagation. The fine scale analysis showed chaotic structure of the disintegrating jet at the beginning injection phase with intense ligament formation depending on fuel properties and the turbulent cavitating nozzle flow. 

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How to cite

APA:

Zigan, L., Schmitz, I., Wensing, M., & Leipertz, A. (2010). Effect of fuel properties on primary breakup and spray formation studied on a gasoline 3-hole nozzle. In Proceedings of the 23rd Annual Conference on Liquid Atomization and Spray Systems. Brno, CZ.

MLA:

Zigan, Lars, et al. "Effect of fuel properties on primary breakup and spray formation studied on a gasoline 3-hole nozzle." Proceedings of the 23rd Annual Conference on Liquid Atomization and Spray Systems, Brno 2010.

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