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Heshmati N, Mirsajedi S. Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame. Modares Mechanical Engineering 2020; 20 (10) :2509-2519
URL: http://mme.modares.ac.ir/article-15-42960-en.html
Experimental Investigation of the Effects of Burner Nozzle Length Changes on Combustion Characteristics of a Swirl Premixed Flame
N. Heshmati * 1, S.M. Mirsajedi2
1- Aerospace Engineering Department, New Science & Technologies Faculty, Shahid Beheshti University, Tehran, Iran , na.heshmati@mail.sbu.ac.ir
2- Aerospace Engineering Department, New Science & Technologies Faculty, Shahid Beheshti University, Tehran, Iran
Abstract:   (1690 Views)
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%).
Keywords: Low-Swirl Combustion, Flame Stability, Radius Ratio, Nozzle Length
Full-Text [PDF 1278 kb]   (2031 Downloads)    
Article Type: Original Research | Subject: Experimental Fluid Mechanics
Received: 2020/05/17 | Accepted: 2020/08/18 | Published: 2020/10/11
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