期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 10, 页码 6936-6954出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.12.026
关键词
OpenFOAM; Obstacle; Detonation; Diffraction; Re-initiation
资金
- National Natural Science Foundation of China [51976082, 91641113]
- Qing Lan Project
- Research and practice innovation program for Postgraduates of Jiangsu Province [KYCX20_3022]
The DCRFoam solver on the OpenFOAM platform is used to simulate the reflection and diffraction processes of detonation waves colliding with different objects. The study finds that the re-initiation distance of detonation waves increases with the increase of cylindrical obstacle diameter, and the suppression effects of inverted triangle and square obstacles on detonation waves are more evident.
The DCRFoam solver (density-based compressible solver) built on the OpenFOAM platform is used to simulate the reflection and diffraction processes that occur when detonation waves collide with various objects. Static stoichiometric hydrogen-oxygen mixtures diluted with 70% Ar are used to form stable detonation waves with large cells, with initial conditions of 6.67 kPa pressure and 298 K temperature. The diameters of the cylindrical obstacle range from 6 mm to 22 mm, with x = 230 mm, x = 244 mm, and x = 257 mm being the chosen position. Cylindrical, square, triangular, and inverted triangular obstacles are used, and the quenched detonation re-initiation processes behind them are investigated. In the detonation diffraction process, four triple points exist at the same time due to the effect of cylindrical obstacles of smaller diameters. The re-initiation distance of the detonation wave increases with the increase of cylindrical obstacle diameter. Both the Mach reflection angle and the decoupled angle decrease as the diameter increases. When the location of the cylindrical obstacles is changed, the detonation wave dashes into the obstacles with its different front structures, it is easier to realize the detonation re-initiation when the weak incident shock at the front of a detonation wave strikes the obstacles, and the re-initiation distance decreases by 17.1% when compared with the longest re-initiation distance. The detonation re-initiation distance is shortest under the action of cylindrical obstacles, however the quenched detonation cannot be re-initiated when the inverted triangle and square obstacles are used. The suppression effects of inverted triangle and square obstacles on detonation waves are more evident. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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