This paper presents experimental study on self-excited combustion instability characteristics of premixed low-swirl flames in a multinozzle can combustor with counterswirl and coswirl arrays. Experiments were carried out over a wide range of inlet velocity from 4 m/s to 15.5 m/s and equivalence ratio from 0.5 to 0.85. Phase-locked OH planar laser-induced fluorescence was employed to measure flame shape and identify heat release rate. Four operation regions: stable combustion region, unstable combustion region, flashback region, and extinguish region are observed for both array burners. The amplitude of pressure fluctuation for counterswirl arrangement is less than the coswirl array, and the stable operating window of the counterswirl array is wider. In the unstable combustion region, the counterswirl flame triggers the 2L mode of the combustion system, while the coswirl flame incites three longitudinal modes with the highest amplitude near 3L. Rayleigh index distribution reveals neighboring flame interaction results in thermoacoustic coupling for multinozzle flames. Additionally, for the counterswirl array, thermoacoustic couplings also exit in the flame base region and shear region while, for the coswirl array, the instability driving zones also locate at the lip region and the tail of center flame which is totally different with counterswirl flame.
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June 2017
Research-Article
Experimental Study on Instability Characteristics of Low-Swirl Flames in a Multinozzle Combustor With Different Swirling Arrays
Weijie Liu,
Weijie Liu
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: zhanshen@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: zhanshen@sjtu.edu.cn
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Bing Ge,
Bing Ge
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: gebing@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: gebing@sjtu.edu.cn
Search for other works by this author on:
Yinshen Tian,
Yinshen Tian
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: tyshen@qq.com
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: tyshen@qq.com
Search for other works by this author on:
Shusheng Zang,
Shusheng Zang
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: sszang@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: sszang@sjtu.edu.cn
Search for other works by this author on:
Shilie Weng
Shilie Weng
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: slweng@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: slweng@sjtu.edu.cn
Search for other works by this author on:
Weijie Liu
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: zhanshen@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: zhanshen@sjtu.edu.cn
Bing Ge
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: gebing@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: gebing@sjtu.edu.cn
Yinshen Tian
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: tyshen@qq.com
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: tyshen@qq.com
Shusheng Zang
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: sszang@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: sszang@sjtu.edu.cn
Shilie Weng
Institute of Turbomachinery,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: slweng@sjtu.edu.cn
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Dongchuan Road 800,
Shanghai 200240, China
e-mail: slweng@sjtu.edu.cn
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 21, 2016; final manuscript received December 19, 2016; published online February 1, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Jun 2017, 139(6): 061503 (9 pages)
Published Online: February 1, 2017
Article history
Received:
October 21, 2016
Revised:
December 19, 2016
Citation
Liu, W., Ge, B., Tian, Y., Zang, S., and Weng, S. (February 1, 2017). "Experimental Study on Instability Characteristics of Low-Swirl Flames in a Multinozzle Combustor With Different Swirling Arrays." ASME. J. Eng. Gas Turbines Power. June 2017; 139(6): 061503. https://doi.org/10.1115/1.4035660
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