Numerical study on ethylene-air continuous rotating detonation in annular combustors with different widths

Fan, Wei-jie; Liu, Weidong; Peng, Haoyang; Liu, Shijie; Sun, Jie

doi:10.1631/jzus.a2100448

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…Hansmetzger et al [7] studied the influence of inner wall geometry on RDW propagation in the annular combustor and found that the velocity and pressure of the detonation wave increased when the length of the center body was shortened or the center half angle was increased. Fan et al [22] investigated the impact of combustor width on RDW fueled by ethylene and air and found that as the combustor width increased, the RDW propagated more steadily and faster, but the average thrust decreased. Zhu et al [23] studied the RDW propagation characteristics and performance parameters influenced by nozzle configurations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Combustor Outlet Geometry on Operating Characteristics of Disk-Shaped Rotating Detonation Engine

Xia,

Ma,

et al. 2023

Aerospace

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A disk-shaped rotating detonation engine with H2/air mixture was tested to identify the impact of combustor outlet geometry on the engine’s operating characteristics. Three combustor outlet diameters and five outlet lengths are employed in the experiments. Results show that with the increase of combustor convergent ratio, the propagation stability of the rotating detonation wave decreases, and the propagation velocity and pressure peak decrease slightly. When the convergent ratio increases to a certain value (1.70 in this study), a “platform zone” with a lower pressure value appears before the sharp rise of the dynamic pressure curve. The propagation mode varies with the increase of mass flow rate at different convergent ratios. As the mass flow rate increases, the wave head number in the combustor increases. But the change rule of propagation mode with mass flow rate is greatly affected by convergent ratio. Increasing the convergent ratio is conducive to the formation of multi-wave modes, and the critical mass flow rate for mode transition drops sharply. When the convergent ratio increases to 1.70, the unstable asymmetric dual-wave mode is obtained. With the increase in the convergent ratio, the engine’s operating range and operating stability decrease significantly. Finally, changing the combustor outlet length has little influence on the engine’s operating characteristics and detonation-wave parameters.

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Section: Introductionmentioning

confidence: 99%

Effect of Combustor Outlet Geometry on Operating Characteristics of Disk-Shaped Rotating Detonation Engine

Xia,

Ma,

et al. 2023

Aerospace

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Experimental investigation into effects of combustor structure on characteristics of rotating detonation of cracked kerosene gas

Han,

Yang,

Wang

et al. 2024

Physics of Fluids

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This study examines the influence of the structure of the combustor on the propagation of rotating detonation waves (RDWs) of cracked kerosene gas (CKG) by using oxygen-rich air, with mass fractions of oxygen of 36% and 48%, as the oxidant while maintaining stable values of the state parameters of CKG. The experimental results showed that the structure of the combustor played a key role in the initiation and stable propagation of CKG, and suitable values of its width and the width of its outlet promoted the stable self-sustained propagation of the RDWs. Combustors of 8 and 14 mm width failed to initiate with 36% oxygen-rich air and without blockage ratio. In the combustors of 20 and 26 mm width, as the blockage ratio increased, the modes of propagation of the RDW included a single stable RDW, intermittent single RDW, and four, six, and eight counter-rotating RDWs. With the further increase in the blockage ratio, the reflected shock wave at the end of the combustor was enhanced, resulting in an increase in the number of RDW wave heads. As a result, the height of the fresh fuel layer was decreased, the mixing time was decreased and led to a decrease in the RDW velocity. The increase in the width of the combustor was conducive to the radial and axial diffusion of fuel and oxidizer in the combustor, which led to an obvious increase in the propagation velocity of RDW. In the 26 mm width combustor, the maximum RDW velocity is 1769 m/s.

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Numerical study on ethylene-air continuous rotating detonation in annular combustors with different widths

Cited by 2 publications

References 41 publications

Effect of Combustor Outlet Geometry on Operating Characteristics of Disk-Shaped Rotating Detonation Engine

Effect of Combustor Outlet Geometry on Operating Characteristics of Disk-Shaped Rotating Detonation Engine

Experimental investigation into effects of combustor structure on characteristics of rotating detonation of cracked kerosene gas

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