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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Evaporation of Bi-Component Droplets in a Highly Turbulent Channel Flow

Adrien Jean
Institut de Mécanique des Fluides de Toulouse, Allée pr. Camille Soula, 31400, Toulouse, France; Université de Toulouse, Toulouse, France

Rudy Bazile
Institut de Mécanique des Fluides de Toulouse, allée du Professeur Camille Soula, 31000 Toulouse, France

Bernard Ferret
Institut de Mécanique des Fluides de Toulouse, allée du Professeur Camille Soula, 31000 Toulouse, France

DOI: 10.1615/IHTC15.tps.009815
pages 9001-9014


KEY WORDS: Two-phase/Multiphase flow, Turbulent transport, Experimental work, evaporation, bi-bomponent uel droplets, poly-dispersed spray, combustion chamber

Abstract

To better understand the phenomena that occur in a jet engine combustion chamber where multi-component fuel droplets are injected, the influence of the fuel composition upon the liquid droplets' behavior in a turbulent air flow is investigated experimentally. In particular, the effect of the presence of an alcohol in the fuel is explored. A model experiment has been designed purposely, which enables to create in a canal a heated, highly turbulent air flow with good properties of homogeneous and isotropic turbulence, and yet with high levels of turbulent fluctuations. A spray of poly-dispersed bi-component acetone/ethanol fuel droplets is injected coaxially in the established zone of the air flow. The large range of droplet sizes ensures that they have a wide variety of behaviors with regard to turbulence. An optical access allows the observation of the turbulent two-phase flow and its evolution in the channel. Measurement campaigns are conducted using Planar Laser-Induced Fluorescence to characterize the droplets' evaporation regimes. Instantaneous acetone vapor concentrations are extracted from these measurements and it is found that acetone evaporates faster from bi-component droplets as compared with pure acetone droplets.

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