Investigation of Sharp Corners’ Jet Flames
Ghada Abd El Zaher El-Saeed Ali El-Gamal;
Abstract
ABSTRACT
Reactants mixing has a great effect on the combustion efficiency, and the use of sharp corners in nozzles has recently been investigated as an approach to obtain better mixing conditions for inverse jet diffusion flames and to generate a fully developed flame with a low percentage of unburned hydrocarbons. The present work examines the effect of using nozzles with sharp corners on inverse jet diffusion flames experimentally, as well as by numerical simulations. This research has been held for reacting flow, using nine different sharp corners nozzles with an approximate equivalent diameter of 12.38 mm. A circular nozzle is adopted as a reference value for comparison. The experiments were held at a constant air to fuel ratio of 50.30. The results showed that increasing the number of sharp corners led to an increase of 38.54 % in the temperature fluctuations. Consequently, there was a reduction of 13.78 % in the peak temperature using the cross nozzle and an increase of 30% for the octagon nozzle. The triangular nozzle showed an effective enhancement in the fuel to air mixing rates such that the flame length was shortened by 50 %.
Reactants mixing has a great effect on the combustion efficiency, and the use of sharp corners in nozzles has recently been investigated as an approach to obtain better mixing conditions for inverse jet diffusion flames and to generate a fully developed flame with a low percentage of unburned hydrocarbons. The present work examines the effect of using nozzles with sharp corners on inverse jet diffusion flames experimentally, as well as by numerical simulations. This research has been held for reacting flow, using nine different sharp corners nozzles with an approximate equivalent diameter of 12.38 mm. A circular nozzle is adopted as a reference value for comparison. The experiments were held at a constant air to fuel ratio of 50.30. The results showed that increasing the number of sharp corners led to an increase of 38.54 % in the temperature fluctuations. Consequently, there was a reduction of 13.78 % in the peak temperature using the cross nozzle and an increase of 30% for the octagon nozzle. The triangular nozzle showed an effective enhancement in the fuel to air mixing rates such that the flame length was shortened by 50 %.
Other data
| Title | Investigation of Sharp Corners’ Jet Flames | Other Titles | دراسة اللهب ذات المنفوثات حادة الأركان | Authors | Ghada Abd El Zaher El-Saeed Ali El-Gamal | Issue Date | 2018 |
Recommend this item
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.