Experimental study of DDT in hydrogen-methane-air mixtures in a tube filled with square orifice plates
| Autor: | Luqing Wang, Dai-Guo Chen, Zhaowu Shen, Hong-Hao Ma |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Materials science Hydrogen 020209 energy General Chemical Engineering Detonation Orifice plate chemistry.chemical_element 02 engineering and technology medicine.disease_cause Soot chemistry 0202 electrical engineering electronic engineering information engineering medicine Environmental Chemistry Deflagration Composite material Tube (container) Safety Risk Reliability and Quality FOIL method Ambient pressure |
| Zdroj: | Process Safety and Environmental Protection. 116:228-234 |
| ISSN: | 0957-5820 |
| DOI: | 10.1016/j.psep.2018.01.017 |
| Popis: | Deflagration to detonation (DDT) experiments with stoichiometric hydrogen-methane-air mixtures at ambient pressure (1 atm) and temperature (293 K) were carried out in a 112 × 112 mm by 6 m long tube with various obstacle configurations. The hydrogen fraction in fuel mixtures ranged from 0 to 1. Two types square orifice plates with opening sides of 86.8 mm and 70.8 mm (blockage ratios of 0.4 and 0.6), spaced at 1, 2, 3 and 4 times the tube height were employed. Flame signals were detected by photodiodes spaced evenly, from which the average velocity could determined. The detonation cell size was obtained using soot foil technique. CJ detonations can still propagate in less sensitive mixtures with larger detonation cell sizes. At the DDT limits, the ratio of the height of the orifice plate (d) and the detonation cell size (λ) increases with the increase of the blockage ratio and the decrease of obstacle spacing. This indicate that in a square tube with square orifice plates, the detonation initiation process as well as the detonation propagation mechanism govern the DDT limits. |
| Databáze: | OpenAIRE |
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