الفهرس 
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Abstract
An experimental study is carried out to investigate the effect of changing the axial location and the shape of the annular ribs on the heat transfer characteristics, combustion and gas analysis in the premixed flame burner. These annular ribs are inserted coaxially with a longitudinal flame tube. In order to investigate the effect of insertion the rib experimentally, a test rig is constructed in the combustion laboratory of the Faculty of Engineering of Ain Shams University. The mixture which is used in this experimental work is air and LPG fuel, the fuel is LPG where its standard HD-5 propane component is (min 90% C3H8, max 5% C3H6 and 5% C4H10 by volume). A test rig is constructed to investigate the effect of insertion square edged and triangle edged annular ribs and the location of annular ribs relative to the burner tip on the heat transfer characteristics. The experimental work is carried out for the different conditions of combustion (stoichiometric with air to fuel equivalence ratio λ=1, lean with air to fuel equivalence ratio λ=1.3 and rich with air to fuel equivalence ratio λ=0.9). The test rig is constructed to carry out the measurements and experimental work using LPG fuel. The results for this study is measured at different locations of the longitudinal flame tube (X/D = 0.667, 2.029, 3.552 and 5.171). In order to determine the objective of the present study, the comparison between the measured data by insertion the annular ribs are recorded and compared relative to those without insertion the annular ribs.
The annular rib insertion has shown beneficial and significant effect on heat transfer, combustion characteristics and gas analysis across a longitudinal flame tube using a premixed flame burner over similar combustion without rib insertion. The major conclusions that found from the current study are:-
[3]
- The annular ribs have a significant effect and increases the heat transfer rate across the chamber walls. - There is a significant enhancement on the axial flame and surface temperatures due to using ribs. - For stoichiometric combustion, the maximum heat flux, flame temperature and surface temperature are found. - At the insertion point of the rib (X/D = 2.029), each of maximum surface temperature, flame temperature and maximum heat transfer rate are found. - The effect of the triangle edged rib is greater than the effect of the square edged one on the heat flux and the flame temperature. - The lowest emission of CO occurred for lean combustion after insertion the triangle edged rib at (X/D = 3.667). - The lowest emission of NO occurred for rich combustion after insertion the triangle edged rib at (X/D = 2.029).