Thermoacoustic instability analysis of a laminar lean premixed flame under autoignitive conditions

Yu, Zongming; Ai, Yuhua; Wang, Yue; Luo, Chuanzhi

doi:10.1016/j.combustflame.2020.11.032

Cited by 7 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An empirical correlation was developed based on the present measurements, the form of which was chosen as follows where a , b , c , n 1, and n 2 are independent constants. This function is an extension of the previous analysis conducted by Yu (eq 24). Two exponents, n 1 and n 2, were added to mimic the nonlinear effects and improve the accuracy in data fitting.…”

Section: Results and Discussionmentioning

confidence: 80%

Experimental Investigation of Lean Methane–Air Laminar Premixed Flames at Engine-Relevant Temperatures

Luo

Wang

et al. 2021

ACS Omega

Self Cite

View full text Add to dashboard Cite

Lean premixed combustion is one of the most effective methods to constrain pollutant emissions for modern industrial gas turbines. An experimental study was performed on its propagation speed and internal structure at engine-relevant temperatures. A Bunsen burner was employed for the measurement with an optical schlieren system. The results show that the increase of preheating temperature dramatically accelerates the propagation of methane flames. The numerical results predicted by GRI-Mech 3.0, FFCM-1, and USC Mech II were also compared. The GRI-Mech 3.0 seems to overestimate the laminar flame speed at high operating conditions, while FFCM-1 underestimates the laminar flame speed compared to the present experimental data. The prediction by FFCM-1 shows good agreement with the overall existing data. The USC Mech II seems to overestimate the laminar flame speed at fuel-lean conditions while shows good agreement with present experimental measurements at stoichiometric conditions when the inlet temperature increases. It is also indicated that the flame is thinned at high-temperature conditions and the importance of CO production to the propagation speed increases. Finally, based on the experimental data, an empirical correlation of the laminar flame speed was developed in the range of T u = 300–800 K and ϕ = 0.7–1.0, the maximum deviation of which was less than 8%. The results of this study may contribute to the optimization of advanced gas turbine combustors.

show abstract

Section: Results and Discussionmentioning

confidence: 80%