The behavior of the propagating velocity of rotating detonation waves and counter-rotating shock waves in a hollow combustor

Rong, Guangyao; Cheng, Miao; Sheng, Zhaohua; Li, Xiangyang; Yunzhen, Zhang; Wang, Jianping

doi:10.1016/j.actaastro.2022.08.033

Cited by 16 publications

(2 citation statements)

References 58 publications

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“…Reduction in chamber diameter or increase in nozzle contraction ratio would lead to continuous rotating detonation deterioration. Rong et al [32] studied the complex wave structure in a hollow combustor with a Laval nozzle and found that decreasing the nozzle convergence ratio can significantly weaken the counterrotating shock wave in a combustor and make the RDW propagate more stable. Sun et al [33] found that a Laval nozzle is beneficial for a hollow RDE to achieve more steady operation and higher thrust output.…”

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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“…Through experiments and numerical simulations, a large number of scholars have conducted extensive research on the propagation law of gas explosions in pipelines with different structures and obstacles [9,10]. Salzano et al [11] found that the blocking rate and cross-section area change in pipes would result in turbulence.…”

Section: Introductionmentioning

confidence: 99%

Effects of Abrupt Cross-Section Area Change on theMultiparameter Propagation Characteristics of Premixed Methane–Air Explosion in Pipes

et al. 2023

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This paper explores the effects of an abrupt cross-section area change of gas pipes on the propagation law of explosion. For this, an explosion pipe experimental system was established, and a numerical research was conducted. By experimental and numerical simulation, the evolution of the overpressure, temperature, vorticity, and kinetic energy of shock waves of gas explosion in abrupt pipelines was investigated. This allowed us to obtain expressions for the attenuation coefficient, increase coefficient, and reflection coefficient of gas explosion overpressure. The study indicates that an abrupt increase of the pipeline cross-section area leads to a decrease of shock wave overpressure and vice versa. For a given change of cross-section area, the attenuation coefficient gradually increases as the initial peak overpressure rises, whereas the increase coefficient and reflection coefficient both present a decreasing trend. An abrupt change in the pipe structure can inhibit the propagation of gas explosion flames. The explosive gas is affected by the turbulence effect after passing through the middle large-diameter pipe, and the vorticity curve exhibits a clear peak. In addition, the large eddy motion caused by strong confinement increases the kinetic energy of the gas in pipes. The above research outcomes contribute to further enriching the basic theory of gas explosion for the study of gas explosion propagation in mining laneway.

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Experimental research on solid fuel pre-combustion rotating detonation engine

Wang

Han

et al. 2023

Acta Astronautica

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The behavior of the propagating velocity of rotating detonation waves and counter-rotating shock waves in a hollow combustor

Cited by 16 publications

References 58 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

Effects of Abrupt Cross-Section Area Change on theMultiparameter Propagation Characteristics of Premixed Methane–Air Explosion in Pipes

Experimental research on solid fuel pre-combustion rotating detonation engine

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