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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.2018024885
pages 459-480

CORRELATIONS FOR EVAPORATION HISTORY OF FUEL DROPLETS RELEASED INTO A HIGH-PRESSURE NITROGEN CROSS-FLOW PREMIXER

Ahmad Kazemi Fard
Mechanical Engineering Department, Tarbiat Modares University, Tehran 14115-111, Iran
Hassan Khaleghi
Department of Mechanical Engineering, Tarbiat Modares University, Tehran,Iran

ABSTRACT

We report on the fundamentals of a new method for injection of fuel droplets into a cross-flow within a premixer, to improve its performance. We investigate evaporation history of various-sized n-heptane droplets in high-pressure and -temperature nitrogen gas, using a Lagrangian–Eulerian numerical approach. Deploying the Peng–Robinson equation and Van der Waals mixing rule for phase equilibrium of the n-heptane–nitrogen system, we consider gas solubility at the droplet surface and real gas behavior in high pressures. A number of different-sized droplets are injected both individually and collectively into cross-flow. The results indicate that in this situation, the interaction among droplets is negligible. To demonstrate coherence among droplets, a correlation is provided to describe droplet evaporation history with respect to initial droplet size. In addition, by injecting a continuous radial spray perpendicular to the flow in the premix tube, results reveal that droplets are arranged radially based on their initial sizes in the gas flow.


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