Deflagration-to-Detonation Transition in Hydrogen/Air Mixtures with a Concentration Gradient
| Autor: | Thomas Sattelmayer, F. Ettner, Klaus G. Vollmer |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Deflagration to detonation transition
Hydrogen Chemistry General Chemical Engineering Analytical chemistry General Physics and Astronomy Energy Engineering and Power Technology chemistry.chemical_element General Chemistry Mechanics Pressure sensor Photodiode law.invention Shock (mechanics) Acceleration Fuel Technology law Schlieren Communication channel |
| Zdroj: | Combustion Science and Technology. 184:1903-1915 |
| ISSN: | 1563-521X 0010-2202 |
| Popis: | The hazardous potential of hydrogen/air mixtures has intensively been studied assuming a perfect mixture of fuel and oxidant. However, comprehensive risk assessment studies have shown that an inhomogeneous mixture with a vertical concentration gradient is much more likely to be generated in a real accident scenario. From a safety point of view, an open question is whether established criteria such as the 7λ criterion for the determination of the deflagration-to-detonation transition (DDT) limits can be applied to inhomogeneous mixtures as well. For the experimental investigation of DDT in such mixtures an injection mechanism has been developed that produces vertical fuel concentration gradients inside a horizontal channel with large aspect ratio. The channel is equipped with obstacles to enhance flame acceleration. Photodiodes and pressure transducers measure flame and shock arrival times. Schlieren measurements are conducted to track gas mixing behind the obstacles and to track the formation of the deton... |
| Databáze: | OpenAIRE |
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