Journal
FUEL
Volume 261, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.116433
Keywords
Dynamic explosion severity levels; Premixed hydrogen-air mixtures; Initial pressure; Multi-dimensional transient explosion parameters; Explosion reaction mechanism
Categories
Funding
- Natural Science Foundation of China [11802272]
- China Postdoctoral Science Foundation [2019M651085]
- Natural Science Foundation of Shanxi Province [201801D121285]
- Cultivation Programs for Young Scientific Research Personnel of Higher Education Institutions in Shanxi Province [1912200059MZ]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [201802079, 2017152]
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To evaluate dynamic explosion severity levels of premixed hydrogen-air mixtures, pressure sensors were used to test explosion pressure in a spherical pressure vessel (inner diameter: 0.34 m). ANSYS Fluent 19.0 three-dimensional software was used to simulate the explosion process. The results revealed that when the hydrogen volume fraction was 30 vol%, the explosion pressure and pressure rise rate reached maximum values at 1.0 atm. As the initial pressure increased, the explosion pressure, and pressure rise rate increased gradually. At initial pressures of 1.0, 1.2, 1.5, and 2.0 atm, the peak pressure levels were 0.85, 0.87, 0.92, and 0.99 MPa and the pressure rise rates were approximately 198, 241, 302, and 558 MPa/s, respectively. The initial pressure exerted greater effects on the pressure rise rate than did the explosion pressure. The simulation results were consistent with the experimental findings. Moreover, the simulation yielded multi-dimensional transient explosion parameters-such as turbulent kinetic energy distribution-that are difficult to obtain in experiments. The findings pertaining to the physical experiments, numerous simulations, and influence of initial pressure on the explosion reaction mechanism of premixed hydrogen-air mixtures were discussed.
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