Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame

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Heshmati n.; MIRSAJEDI S.M.

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Journal: Modares Mechanical Engineering Year:2020 | Volume:20 | Issue:10 Page(s): 2509-2515

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Title

Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame

Author(s)

Heshmati n. | MIRSAJEDI S.M. | Issue Writer Certificate

Keywords

Low-Swirl CombustionQ1

Flame StabilityQ2

Radius RatioQ1

Nozzle LengthQ1

Abstract

In this study, the effects of burner Nozzle Length changes on combustion characteristics of a swirl premixed flame are investigated. Three nozzles with different lengths (2. 5, 4. 5, and 7cm) have been used. Also, in order to investigate the effect of swirler geometry on the combustion characteristics of flame along with changes in Nozzle Length, 7 swirlers with different geometries were examined. In the study of Flame Stability, certain values of the bulk velocity were selected, which in these values the equivalence ratio of the fuel-air mixture was changed to determine the unfavorable flame condition such as blow-off and flame attachment to the nozzle. By determining these limits, the Flame Stability map was obtained in a range of different swirlers geometries, different burner Nozzle Lengths, and different flow mass velocities. The results showed that by increasing the swirlers Radius Ratio, the blow-off limit of swirlers decreases so that by increasing the Radius Ratio from 0. 57 to 0. 71, the blow-off limit decreases about 15%, and the stability of the flame is improved. Reducing the length of the nozzle increases the flame resistance against blow-off. The amount of NOx increased with equivalence ratio and the slope of the increase in NOx increased for the swirler with a higher Radius Ratio and the in a certain equivalence ratio, the amount of NOx of swirler with a Radius Ratio of 0. 57, which is the lowest Radius Ratio among other swirlers (about 30%).

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APA: Copy

Heshmati, n., & MIRSAJEDI, S.M.. (2020). Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame. MODARES MECHANICAL ENGINEERING, 20(10 ), 2509-2515. SID. https://sid.ir/paper/369709/en

Vancouver: Copy

Heshmati n., MIRSAJEDI S.M.. Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame. MODARES MECHANICAL ENGINEERING[Internet]. 2020;20(10 ):2509-2515. Available from: https://sid.ir/paper/369709/en

IEEE: Copy

n. Heshmati, and S.M. MIRSAJEDI, “Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame,” MODARES MECHANICAL ENGINEERING, vol. 20, no. 10 , pp. 2509–2515, 2020, [Online]. Available: https://sid.ir/paper/369709/en

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