Three-dimensional numerical study of influences of unevenness equivalence ratio on performances of a rotating detonation combustor

LIU Shicheng; GAO Chunyu; ZHOU Shengbing

doi:10.11883/bzycj-2023-0220

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LIU Shicheng, GAO Chunyu, ZHOU Shengbing. Three-dimensional numerical study of influences of unevenness equivalence ratio on performances of a rotating detonation combustor[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0220

Citation:

LIU Shicheng, GAO Chunyu, ZHOU Shengbing. Three-dimensional numerical study of influences of unevenness equivalence ratio on performances of a rotating detonation combustor[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0220

Citation:

LIU Shicheng, GAO Chunyu, ZHOU Shengbing. Three-dimensional numerical study of influences of unevenness equivalence ratio on performances of a rotating detonation combustor[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0220

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Three-dimensional numerical study of influences of unevenness equivalence ratio on performances of a rotating detonation combustor

doi: 10.11883/bzycj-2023-0220

LIU Shicheng^{1, 2
,},
GAO Chunyu^{1, 2},
ZHOU Shengbing^{3
,
,}

1.
China Electronic Product Reliability and Environmental Testing Research Institute, Guangzhou 511370, Guangdong, China
2.
Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology, Guangzhou 511370, Guangdong, China
3.
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China

Received Date: 2023-06-27
Rev Recd Date: 2024-03-20

Available Online: 2024-03-21

Abstract

Abstract

To investigate the effects of the inlet equivalence ratio distribution on the performance of a rotating detonation combustor (RDC), the radial or circumferential function model of equivalence ratio at the entrance of the RDC was established. The distribution function of component mass fraction in radial or circumferential direction was obtained by substituting the function model of equivalence ratio into the function of component mass fraction and equivalence ratio. The distribution function of entry boundary components was constructed by the user-defined function tool in the Fluent code. A three-dimensional transient Euler equation was employed to simulate the propagation process and flow field characteristics of detonation waves in a C₁₀H₂₂/air RDC, and the characteristics parameters of the detonation waves and RDC were compared under different equivalence-ratio distributions. The results show that the uneven distribution of the inlet equivalence ratio will affect the characteristics of the detonation waves. When the equivalence ratio ranges from 0.4 to 1.6 and is not uniformly distributed along the radial direction, the height of the detonation wave decreases with the increase of equivalence ratio at the midline of the inlet surface. When the equivalence ratio ranges from 0.4 to 1.6 and the distribution is non-uniform in the circumferential direction, the height of the detonation wave is almost not affected with the increase of the number of changing periods. The uneven distribution of equivalence ratio will weaken the pressure-gain effect and temperature rise effect of the RDC, and the influence of the uneven distribution of equivalence ratio along the radial direction is more obvious than that along the circumferential direction. In the RDC, the induction and reactant region of detonation wave is not strictly behind the leading shock wave, but is located at the oblique rear of the leading shock wave, and under the influence of curvature, the leading shock wave propagates along the circumference of the middle diameter cylinder near the outer wall of the RDC.
- rotating detonation combustor,
- unevenness equivalence ratio,
- user-defined function,
- pressure-gain effect,
- temperature rise effect

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References(23)

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