Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1936-1944.doi: 10.13229/j.cnki.jdxbgxb20181279

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Effects of radial strut width on flow structure ofsingle⁃cavity trapped vortex combustor

Yi-xiao ZHU1(),Xiao-min HE1,2(),Yi JIN1,2   

  1. 1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016，China
    2. Jiangsu Province Key Laboratory of Aerospace Power Systems, Nanjing University of Aeronautics and Astronautics, Nanjing 210016，China
  • Received:2018-12-27 Online:2019-11-01 Published:2019-11-08
  • Contact: Xiao-min HE E-mail:zyx_tvc@nuaa.edu.cn;hxmnuaa@outlook.com

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Abstract:

In order to study the flow structure of different width of radial strut, a single-cavity trapped vortex combustor with diffuser and casings was designed. Unburnt flow field experiments were carried out by changing the width of radial strut on the combustor. Experiments were accomplished at atmospheric pressure and temperature. The main parameters of the experiments were shown as follows: the width of radial strut was 40,30,20 mm while the number of radial strut was constant. The results showed that on the central section of mainstream (PM), there were two vortices in the cavity. The main vortex was located in the middle of cavity, and the secondary vortex was located between the main vortex and mainstream. On the central section of radial strut (PA), different width of radial strut would form two different flow structures. When the width of radial strut was wider, the cavity had a single-vortex flow structure, which meant that only the main vortex existed in cavity. The reflux airflow from main vortex flowed along the radial strut to the lower wall of the liner. When the width of radial strut was narrower, the cavity had a double-vortex flow structure, which meant that the meanstream flowed to the behind of radial strut.

Key words: power machinery and engineering, single-cavity trapped vortex combustor, width of radial strut, flow structure

CLC Number: 

  • TK411.12

Fig.1

2D schematic diagram of single-cavitytrapped vortex combustor"

Fig.2

Schematic diagram of radial strut structure"

Fig.3

Schematic diagram of unburnt flow field test system"

Table 1

Airflow distributions of differentradial struts width %"

进气位置 联焰板宽度/mm
40 30 20
凹腔前 22.59 19.80 18.15
凹腔后 10.92 8.61 6.82
凹腔主流 37.08 47.94 55.09

Fig.4

Schematic diagram of test measurement sections"

Fig.5

Flow structures in XY section with different width of radial strut"

Fig.6

Flow structures in XZ plane with different width of radial strut"

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