Combustion modes and driving mechanisms of pressure fluctuation in a novel vortex-tube combustor with quasi-steady and stratified properties

doi:10.1016/j.expthermflusci.2020.110134

GIEC OpenIR

	Combustion modes and driving mechanisms of pressure fluctuation in a novel vortex-tube combustor with quasi-steady and stratified properties
	Ren, Shoujun 1,2; Yang, Haolin1 ; Jiang, Liqiao1 ; Zhao, Daiqing1,2 ; Wang, Xiaohan1
	2020-09-01
发表期刊	EXPERIMENTAL THERMAL AND FLUID SCIENCE
ISSN	0894-1777
卷号	117 页码:9
通讯作者	Yang, Haolin(yanghl@ms.giec.ac.cn) ; Zhao, Daiqing(zhaodq@ms.giec.ac.cn)
摘要	The operating limit and pressure fluctuations of a localized stratified vortex-tube combustor (LSVC) are investigated experimentally by taking methane as fuel at the inlet temperature of 300 K and the combustor pressure of 1 atm over a range of equivalence ratios (0.1-1.0). The combustion modes are distinguished according to the properties of pressure fluctuations and the driving mechanisms of each combustion mode are explored in combination with numerical simulation. The results show that the LSVC can realize stable combustion with pressure fluctuation amplitudes always less than 4 kPa in a large operating range, and the flame front is always continuous. The operating flammability limit experimental range can be divided into five regimes with different combustion modes. The first and fifth combustion modes are steady combustion with pressure fluctuation amplitudes less than 1 kPa, and the second to fourth ones are quasi-steady combustion with pressure fluctuation amplitudes between 1-4 kPa. The spectrum analyses of pressure fluctuations show that there are one low-frequency peak around 300 Hz and one high-frequency peak around 1500 Hz, which are dominated by the first and third axial natural acoustic modes of resonant oscillation combustion, respectively. In the first and fifth combustion modes, the resonances are both weak due to the influences of low flow rate and laminarization respectively. In the second mode, the thermo-acoustic coupling oscillation and the resonance are excited simultaneously, yielding the highest pressure fluctuation amplitude in the entire operating range. The high-frequency resonance causes the high-frequency pressure fluctuation of the third mode. Both the unsteady heat release and flow field affect the pressure fluctuation in the fourth mode. The former produces the low-frequency fluctuation, which can resonate with the natural frequency and excite a weak thermal-acoustic coupling.
关键词	Vortex-tube combustor Pressure fluctuation Combustion mode Driving mechanism Axial natural acoustic mode
DOI	10.1016/j.expthermflusci.2020.110134
关键词[WOS]	FLAMES ; LAMINARIZATION ; INSTABILITIES
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Plan of China[2016YFE0127500]
WOS研究方向	Thermodynamics ; Engineering ; Physics
项目资助者	National Key Research and Development Plan of China
WOS类目	Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
WOS记录号	WOS:000537566000005
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/27224
专题	中国科学院广州能源研究所
通讯作者	Yang, Haolin; Zhao, Daiqing
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangdong Key Lab New & Renewable Energy Res & De, Key Lab Renewable Energy, Guangzhou 510640, Peoples R China 2.Nanjing Univ Aeronaut & Astronaut, Coll Energy & Power Engn, Jiangsu Prov Key Lab Aerosp Power Syst, Nanjing 210016, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Ren, Shoujun,Yang, Haolin,Jiang, Liqiao,et al. Combustion modes and driving mechanisms of pressure fluctuation in a novel vortex-tube combustor with quasi-steady and stratified properties[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2020,117:9.
APA	Ren, Shoujun,Yang, Haolin,Jiang, Liqiao,Zhao, Daiqing,&Wang, Xiaohan.(2020).Combustion modes and driving mechanisms of pressure fluctuation in a novel vortex-tube combustor with quasi-steady and stratified properties.EXPERIMENTAL THERMAL AND FLUID SCIENCE,117,9.
MLA	Ren, Shoujun,et al."Combustion modes and driving mechanisms of pressure fluctuation in a novel vortex-tube combustor with quasi-steady and stratified properties".EXPERIMENTAL THERMAL AND FLUID SCIENCE 117(2020):9.