On the Flow Structure and Dynamics of Methane and Syngas Lean Flames in a Model Gas-Turbine Combustor

被引：8

作者：

Dulin, Vladimir ^{[1
,2
]}

Chikishev, Leonid ^{[1
,2
]}

Sharaborin, Dmitriy ^{[1
]}

Lobasov, Aleksei ^{[1
]}

Tolstoguzov, Roman ^{[1
,2
]}

Liu, Zundi ^{[3
]}

Shi, Xiaoxiang ^{[3
]}

Li, Yuyang ^{[3
]}

Markovich, Dmitriy ^{[1
]}

机构：

[1] Kutateladze Inst Thermophys, 1 Lavrentyev Ave, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, Dept Phys, 1 Pirogov St, Novosibirsk 630090, Russia

[3] Shanghai Jiao Tong Univ, Sch Mech Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

来源：

ENERGIES | 2021年 / 14卷 / 24期

关键词：

synthesis gas; syngas; combustion chamber; swirl combustor; swirling flame; gas as turbine combustor; particle image velocimetry; planar laser-induced fluorescence; proper orthogonal decomposition; LASER-INDUCED-FLUORESCENCE; LOW-SWIRL INJECTOR; HEAT-RELEASE; H-2/CO/CH4; SYNGAS; AIR FLAMES; OH; INSTABILITY; TEMPERATURE; CHEMILUMINESCENCE; THERMOMETRY;

D O I：

10.3390/en14248267

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The present paper compares the flow structure and flame dynamics during combustion of methane and syngas in a model gas-turbine swirl burner. The burner is based on a design by Turbomeca. The fuel is supplied through injection holes between the swirler blades to provide well-premixed combustion, or fed as a central jet from the swirler's centerbody to increase flame stability via a pilot flame. The measurements of flow structure and flame front are performed by using the stereo particle image velocimetry and OH planar laser-induced fluorescence methods. The measurements are performed for the atmospheric pressure without preheating and for 2 atm with the air preheated up to 500 K. The flow Reynolds numbers for the non-reacting flows at these two conditions are 1.5 x 10(3) and 1.0 x 10(3), respectively. The flame dynamics are analyzed based on a high-speed OH* chemiluminescence imaging. It is found that the flame dynamics at elevated conditions are related with frequent events of flame lift-off and global extinction, followed by re-ignition. The analysis of flow structure via the proper orthogonal decomposition reveals the presence of two different types of coherent flow fluctuations, namely, longitudinal and transverse instability modes. The same procedure is applied to the chemiluminescence images for visualization of bulk movement of the flame front and similar spatial structures are observed. Thus, the longitudinal and transverse instability modes are found in all cases, but for the syngas at the elevated pressure and temperature the longitudinal mode is related to strong thermoacoustic fluctuations. Therefore, the present study demonstrates that a lean syngas flame can become unstable at elevated pressure and temperature conditions due to a greater flame propagation speed, which results in periodic events of flame flash-back, extinction and re-ignition. The reported data is also useful for the validation of numerical simulation codes for syngas flames.

引用

页数：20

共 82 条

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