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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL SIMULATION STUDY OF DOUBLE DROPLETS COMBUSTION BASED ON THE VOF MODEL

Yazhou Shao
Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin 150001, China

Longbin Yang
Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin 150001, China

Guolei Zhang
Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin 150001, China

Fuyuan Song
Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin 150001, China

Runzhang Xu
Harbin Engineering University, 145 Nantong Street, Nangang District, Harbin 150001, China

Abstract

A VOF model is used to simulate process of evaporation and combustion of two fuel droplets under convective ambient. The influences of droplets spacing on the combustion characteristics of double droplets with a fixed droplet size (R1=40μm, R2=50μm) are obtained. The simulation results indicate that the droplet evaporation process can be divided into two stages, namely a heating stage and a stable evaporation stage. Due to the convective environment, ignition occurs at the back droplet tail first and a wake flame forms. The interaction between the front and back droplet reduces the evaporation rates of these two droplets comparing with individual combustion. As the droplets spacing increases, the burning rates of the front and the back droplets also increase gradually. In any spacing used in this experiment, the transient burning rate of the front droplet is always greater than that of the back one. The burning rate of the droplet is more sensitive with spacing changing in the range of S=150μm~200μm. When the spacing continues increasing, this sensitivity slows down and each droplet burns without any interactions.

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