TY - JOUR
T1 - Flame propagation and spectrum characteristics of CH4-air gas mixtures in a vertical pressure relief pipeline
AU - Wang, Qiuhong
AU - Yang, Songping
AU - Jiang, Juncheng
AU - Liu, Zhu
AU - Shu, Chi Min
N1 - Publisher Copyright:
© 2022
PY - 2022/6/1
Y1 - 2022/6/1
N2 - The explosion characteristics, flame propagation mechanism, and spectrum characteristics of five free radicals (C2·, CHO·, CH·, O·, and OH·), formaldehyde (CH2O), and one reagent (O2) under various concentrations (w) of methane were investigated using a vertical rectangular pressure relief pipeline. The experimental results indicated that the instantaneous flame propagation speed (v), maximum flame temperature (Tex), maximum explosion pressure, and relative spectrum intensity (I) first increased and subsequently decreased with methane concentration. The maximum instantaneous flame propagation speed (vmax), maximum flame temperature (Tmax), maximum explosion pressure (Pmax), and maximum relative spectrum intensity (Imax) were achieved, and the time taken to form a tulip-shaped flame was the shortest at w = 10 vol%. The experiment also revealed that Tex and w had a polynomial relationship. In the explosion process, positive correlations were noted among the T, P, and I. Furthermore, the spectrum signal characteristic times of the intermediate species was considerably influenced by v. When the methane concentration was 9.5 vol%, the I of the seven intermediate generation rates exhibited two distinct trends. This finding contributes to the analysis and validation of the microscopic mechanism underlying gas explosion flame propagation. Further, a reference for selecting new gas explosion suppressants based upon the attenuation level of free radical spectrum intensity.
AB - The explosion characteristics, flame propagation mechanism, and spectrum characteristics of five free radicals (C2·, CHO·, CH·, O·, and OH·), formaldehyde (CH2O), and one reagent (O2) under various concentrations (w) of methane were investigated using a vertical rectangular pressure relief pipeline. The experimental results indicated that the instantaneous flame propagation speed (v), maximum flame temperature (Tex), maximum explosion pressure, and relative spectrum intensity (I) first increased and subsequently decreased with methane concentration. The maximum instantaneous flame propagation speed (vmax), maximum flame temperature (Tmax), maximum explosion pressure (Pmax), and maximum relative spectrum intensity (Imax) were achieved, and the time taken to form a tulip-shaped flame was the shortest at w = 10 vol%. The experiment also revealed that Tex and w had a polynomial relationship. In the explosion process, positive correlations were noted among the T, P, and I. Furthermore, the spectrum signal characteristic times of the intermediate species was considerably influenced by v. When the methane concentration was 9.5 vol%, the I of the seven intermediate generation rates exhibited two distinct trends. This finding contributes to the analysis and validation of the microscopic mechanism underlying gas explosion flame propagation. Further, a reference for selecting new gas explosion suppressants based upon the attenuation level of free radical spectrum intensity.
KW - Flame propagation mechanism
KW - Flame temperature
KW - Free radical
KW - Methane
KW - Pressure relief pipeline
KW - Spectrum intensity
UR - http://www.scopus.com/inward/record.url?scp=85124430646&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2022.123413
DO - 10.1016/j.fuel.2022.123413
M3 - 文章
AN - SCOPUS:85124430646
SN - 0016-2361
VL - 317
JO - Fuel
JF - Fuel
M1 - 123413
ER -