| Citation: | QIN Ziyu, HAN Xiao, LI Lei, et al. Influence of slope-wall confinement step on flame macrostructure[J]. Journal of Aerospace Power, 2025, 40（2）：20230225 doi: 10.13224/j.cnki.jasp.20230225
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Slope-wall confinement is an effective passive control method for combustion oscillation. To deeply understand its flame stabilization characteristics, the influence of step height in the slope-wall confinement on the flame macrostructure was explored. Numerical simulation showed that increasing the height of the step changed the flame macrostructure from V-shaped to M-shaped structure. By quantitatively calculating the flame stretch rate, it was found that this transition was accompanied by the occurrence of an area with a significantly strong stretch flow on the outside of the slope-wall transition section. Combined with the small disturbance linear stability theory, the reason for this phenomenon can be summarized as the structural feature-length scale was larger than the spatial unstable mode 1/4 wavelength length scale. Thus, the inherently unstable mode was excited, and a region with a strong stretch rate for flame stabilization was formed. This method was used to predict the height of the critical step, through which the absolute error did not exceed 0.1 mm.
| [1] |
SHANBHOGUE S J,SANUSI Y S,TAAMALLAH S,et al. Flame macrostructures,combustion instability and extinction strain scaling in swirl-stabilized premixed CH4/H2 combustion[J]. Combustion and Flame,2016,163: 494-507. doi: 10.1016/j.combustflame.2015.10.026
|
| [2] |
TAAMALLAH S,CHAKROUN N W,WATANABE H,et al. On the characteristic flow and flame times for scaling oxy and air flame stabilization modes in premixed swirl combustion[J]. Proceedings of the Combustion Institute,2017,36(3): 3799-3807. doi: 10.1016/j.proci.2016.07.022
|
| [3] |
TAAMALLAH S,SHANBHOGUE S J,GHONIEM A F. Turbulent flame stabilization modes in premixed swirl combustion: physical mechanism and Karlovitz number-based criterion[J]. Combustion and Flame,2016,166: 19-33. doi: 10.1016/j.combustflame.2015.12.007
|
| [4] |
TEMME J E,ALLISON P M,DRISCOLL J F. Combustion instability of a lean premixed prevaporized gas turbine combustor studied using phase-averaged PIV[J]. Combustion and Flame,2014,161(4): 958-970. doi: 10.1016/j.combustflame.2013.09.021
|
| [5] |
LI Lin,LIN Yuzhen,FU Zhenbo,et al. Emission characteristics of a model combustor for aero gas turbine application[J]. Experimental Thermal and Fluid Science,2016,72: 235-248. doi: 10.1016/j.expthermflusci.2015.11.012
|
| [6] |
TAAMALLAH S,LABRY Z A,SHANBHOGUE S J,et al. Thermo-acoustic instabilities in lean premixed swirl-stabilized combustion and their link to acoustically coupled and decoupled flame macrostructures[J]. Proceedings of the Combustion Institute,2015,35(3): 3273-3282. doi: 10.1016/j.proci.2014.07.002
|
| [7] |
GOTODA H,NIKIMOTO H,MIYANO T,et al. Dynamic properties of combustion instability in a lean premixed gas-turbine combustor[J]. Chaos: an Interdisciplinary Journal of Nonlinear Science,2011,21(1): 013124. doi: 10.1063/1.3563577
|
| [8] |
SONG Heng,HAN Xiao,SU Tong,et al. Parametric study of the slope confinement for passive control in a centrally-staged swirl burner[J]. Energy,2021,233: 121188. doi: 10.1016/j.energy.2021.121188
|
| [9] |
BONCIOLINI G,EBI D,DOLL U,et al. Effect of wall thermal inertia upon transient thermoacoustic dynamics of a swirl-stabilized flame[J]. Proceedings of the Combustion Institute,2019,37(4): 5351-5358. doi: 10.1016/j.proci.2018.06.229
|
| [10] |
HUANG Ying,YANG V. Bifurcation of flame structure in a lean-premixed swirl-stabilized combustor: transition from stable to unstable flame[J]. Combustion and Flame,2004,136(3): 383-389. doi: 10.1016/j.combustflame.2003.10.006
|
| [11] |
LEE S Y,SEO S,BRODA J C,et al. An experimental estimation of mean reaction rate and flame structure during combustion instability in a lean premixed gas turbine combustor[J]. Proceedings of the Combustion Institute,2000,28(1): 775-782. doi: 10.1016/S0082-0784(00)80280-5
|
| [12] |
RODRIGUEZ-MARTINEZ V,DAWSON J,SYRED N,et al. The effect of expansion plane geometry on fluid dynamics under combustion instability in a swirl combustor : AIAA2003-116[R]. Reston,US: AIAA,2003.
|
| [13] |
DAWSON J R,RODRIGUEZ-MARTINEZ V M,SYRED N,et al. The effect of combustion instability on the structure of recirculation zones in confined swirling flames[J]. Combustion Science and Technology,2005,177(12): 2349-2371. doi: 10.1080/00102200500241149
|
| [14] |
SONG Heng,LIN Yuzhen,HAN Xiao,et al. The thermoacoustic instability in a stratified swirl burner and its passive control by using a slope confinement[J]. Energy,2020,195: 116956. doi: 10.1016/j.energy.2020.116956
|
| [15] |
LEE C E,PARK S H,HWANG C H. Numerical study of the effect of inlet geometry on combustion instabilities in a lean premixed swirl combustor[J]. Journal of Mechanical Science and Technology,2016,30(11): 5293-5303. doi: 10.1007/s12206-016-1048-y
|
| [16] |
LIU Xunchen,WANG Sirui,WANG Guoqing,et al. High-speed simultaneous PLIF/PIV imaging of a lift-off swirling flame under acoustic forcing[J]. Experimental Thermal and Fluid Science,2021,121: 110259. doi: 10.1016/j.expthermflusci.2020.110259
|
| [17] |
LIEUWEN T C. Unsteady combustor physics[M]. 2nd ed. Cambridge,UK: Cambridge University Press,2021.
|
| [18] |
肖扬,周军. 图像边缘检测综述[J]. 计算机工程与应用,2023,59(5): 40-54. XIAO Yang,ZHOU Jun. Overview of image edge detection[J]. Computer Engineering and Applications,2023,59(5): 40-54. (in Chinese doi: 10.3778/j.issn.1002-8331.2209-0122
XIAO Yang, ZHOU Jun. Overview of image edge detection[J]. Computer Engineering and Applications, 2023, 59(5): 40-54. (in Chinese) doi: 10.3778/j.issn.1002-8331.2209-0122
|
| [19] |
DING Lijun,GOSHTASBY A. On the Canny edge detector[J]. Pattern Recognition,2001,34(3): 721-725. doi: 10.1016/S0031-3203(00)00023-6
|
| [20] |
王一帆,刘凤君,朴英. 剪切层与边界层组合流动的线性不稳定性分析[J]. 航空动力学报,2016,31(7): 1649-1657. WANG Yifan,LIU Fengjun,PIAO Ying. Linear instability analysis of the confluent shear layer and boundary layer flows[J]. Journal of Aerospace Power,2016,31(7): 1649-1657. (in Chinese
WANG Yifan, LIU Fengjun, PIAO Ying. Linear instability analysis of the confluent shear layer and boundary layer flows[J]. Journal of Aerospace Power, 2016, 31(7): 1649-1657. (in Chinese)
|
| [21] |
张策. 传热对流动稳定性的影响研究: 可压粘性流动线性稳定性分析工具的建立及其在有传热圆管流动中的应用[D]. 上海: 上海交通大学,2017. ZHANG Ce. Study on the effect of heat transfer on flow stability: the establishment of linear stability analysis tool for compressible viscous flow and its application in the pipe flow with heat transfer[D]. Shanghai: Shanghai Jiao Tong University,2017. (in Chinese
ZHANG Ce. Study on the effect of heat transfer on flow stability: the establishment of linear stability analysis tool for compressible viscous flow and its application in the pipe flow with heat transfer[D]. Shanghai: Shanghai Jiao Tong University, 2017. (in Chinese)
|
| [22] |
ORSZAG S A. Accurate solution of the Orr-Sommerfeld stability equation[J]. Journal of Fluid Mechanics,1971,50: 689-703. doi: 10.1017/S0022112071002842
|
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