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Effects of Diverging Nozzle Downstream on Flow Field Parameters of Rotating Detonation Combustor

College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
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Appl. Sci. 2019, 9(20), 4259; https://doi.org/10.3390/app9204259
Received: 17 September 2019 / Revised: 6 October 2019 / Accepted: 9 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Environmentally Friendly Gas Turbines)
In this study, three-dimensional numerical studies have been performed to investigate the performance of a rotating detonation combustor with a diverging nozzle downstream. The effects of a diverging nozzle on the formation and propagation process of a detonation wave and typical flow field parameters in a rotating detonation combustor are mainly discussed. The results indicate that the diverging nozzle downstream is an important factor affecting the performance and design of a rotating detonation combustor. The diverging nozzle does not affect the formation and propagation process of the rotating detonation wave, while the time of two key wave collisions are delayed during the formation process of the detonation wave. With increases of the diverging angle, the rotating detonation combustor with the diverging nozzle can still maintain a certain pressure gain performance. Both the diverging nozzle and diverging angle have great influence on the flow field parameters of the rotating detonation combustor, including reducing the high pressure and temperature load, making the distribution of the outlet parameters uniform, and changing the local supersonic flow at the outlet. Among them, the outlet static pressure is reduced by up to 88.32%, and the outlet static temperature is reduced by up to 32.12%. This evidently improves the working environment of the combustor while reducing the thermodynamic and aerodynamic loads at the outlet. In particular, the diverging nozzle does not affect the supersonic characteristics of the outlet airflow, and on this basis, the Mach number becomes coincident and enhanced. View Full-Text
Keywords: rotating detonation combustor; diverging nozzle; formation and propagation process; flow field parameters; numerical study rotating detonation combustor; diverging nozzle; formation and propagation process; flow field parameters; numerical study
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MDPI and ACS Style

Sun, C.; Zheng, H.; Li, Z.; Zhao, N.; Qi, L.; Guo, H. Effects of Diverging Nozzle Downstream on Flow Field Parameters of Rotating Detonation Combustor. Appl. Sci. 2019, 9, 4259.

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