AN EXPERIMENTAL AND NUMERICAL STUDY OF COMBUSTION CHARACTERISTICS IN A STEP SWIRL COMBUSTOR
Eng.Ismaiel Ali Ismaiel;
Abstract
The present work has been established to investigate ,the flame characteristics in step swirler combustor of laboratory-scale. Experiments are performed to reveal the differences in flame structure by changing the inner, middle and outer swirl angle, direction, fuel and air admission configurations.
Stationery curved vane swirler is located near the exit of the air passages. Test conditions are chosen to compare: (i) Co-versus counter swirl configuration. (ii) The degree of swirl angle, which is equal for inner and outer air jet streams.
Visible flame shapes, structure and location are demonstrated under the same equivalence ratio with different test conditions. Temperature and species concentrations (02, CO, and NO) had been measured. The effect of fuel configuration on entire structure of the flames has been analyzed.
Mathematical modeling using a commercial computational fluid dynamics code (CFD) is employed to simulate the flow field and combustion in the sse.
The case in which the fuel jet stream is admitted without swirl between two non swirl air jet streams is considered as a base case. The results of the present investigation indicate that the flame length decreases and the width increases as the air swirler angle is increased. The flames could be stabilized without swirler with admitting fuel jet stream between two axial sandwich air jet streams. Injection of fuel jet stream between two air jet streams requires no combustion air swirl for stabilization. This creates a wider mixing surface, which enhance the mixing between fuel and air streams. Admitting the fuel jet provided with swirler between two combustion air jets produce minor change in flame structure compared with admitting fuel without swirl between two air streams without swirler. Comparison of the flame characteristics of co-swirl cases versus counter swirl cases shows that the flame width and length for counter swirl is less than the co-swirl cases. Admitting the fuel stream coaxially sandwiched between inner and outer air streams while imparting a certain equal degree of co-swirl to all streams leads to slight decrease in flame height while little increase in corresponding flame width. No other noticeable changes are observed between these flames.
Stationery curved vane swirler is located near the exit of the air passages. Test conditions are chosen to compare: (i) Co-versus counter swirl configuration. (ii) The degree of swirl angle, which is equal for inner and outer air jet streams.
Visible flame shapes, structure and location are demonstrated under the same equivalence ratio with different test conditions. Temperature and species concentrations (02, CO, and NO) had been measured. The effect of fuel configuration on entire structure of the flames has been analyzed.
Mathematical modeling using a commercial computational fluid dynamics code (CFD) is employed to simulate the flow field and combustion in the sse.
The case in which the fuel jet stream is admitted without swirl between two non swirl air jet streams is considered as a base case. The results of the present investigation indicate that the flame length decreases and the width increases as the air swirler angle is increased. The flames could be stabilized without swirler with admitting fuel jet stream between two axial sandwich air jet streams. Injection of fuel jet stream between two air jet streams requires no combustion air swirl for stabilization. This creates a wider mixing surface, which enhance the mixing between fuel and air streams. Admitting the fuel jet provided with swirler between two combustion air jets produce minor change in flame structure compared with admitting fuel without swirl between two air streams without swirler. Comparison of the flame characteristics of co-swirl cases versus counter swirl cases shows that the flame width and length for counter swirl is less than the co-swirl cases. Admitting the fuel stream coaxially sandwiched between inner and outer air streams while imparting a certain equal degree of co-swirl to all streams leads to slight decrease in flame height while little increase in corresponding flame width. No other noticeable changes are observed between these flames.
Other data
| Title | AN EXPERIMENTAL AND NUMERICAL STUDY OF COMBUSTION CHARACTERISTICS IN A STEP SWIRL COMBUSTOR | Other Titles | دراسة تجريبية ونظرية لخواص الاحتراق فى حارق حلقى مرحلى التوجيه | Authors | Eng.Ismaiel Ali Ismaiel | Issue Date | 2005 |
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