Polyethylene Pyrolysis Products: Their Detonability in Air and Applicability to Solid-Fuel Detonation Ramjets
| Autor: | Igor O. Shamshin, V. S. Aksenov, I. V. Bilera, S. M. Frolov, V.S. Ivanov, Maxim V. Kazachenko, Valerii I. Zvegintsev |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
polyethylene
Control and Optimization Materials science Hydrogen deflagration-to-detonation transition Analytical chemistry Detonation Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology detonability standard pulsed detonation tube pyrolysis pyrogas fuel-air mixture Zel’dovich cycle Combustion lcsh:Technology 01 natural sciences Methane 010305 fluids & plasmas chemistry.chemical_compound 0203 mechanical engineering Propane 0103 physical sciences Electrical and Electronic Engineering Engineering (miscellaneous) Ramjet Gas generator Deflagration to detonation transition 020301 aerospace & aeronautics lcsh:T Renewable Energy Sustainability and the Environment chemistry pyrogas fuel-air mixture Energy (miscellaneous) |
| Zdroj: | Energies; Volume 14; Issue 4; Pages: 820 Energies, Vol 14, Iss 820, p 820 (2021) |
| ISSN: | 1996-1073 |
| DOI: | 10.3390/en14040820 |
| Popis: | The detonability of polyethylene pyrolysis products (pyrogas) in mixtures with air is determined for the first time in a standard pulsed detonation tube based on the measured values of deflagration-to-detonation transition run-up time. The pyrogas is continuously produced in a gas generator at decomposition temperatures ranging from 650 to 850 °C. Chromatographic analysis shows that at a high decomposition temperature (850 °C) pyrogas consists mainly of hydrogen, methane, ethylene, and ethane, and has a molecular mass of about 10 g/mol, whereas at a low decomposition temperature (650 °C), it mainly consists of ethylene, ethane, methane, hydrogen, propane, and higher hydrocarbons, and has a molecular mass of 24–27 g/mol. In a pulsed detonation mode, the air mixtures of pyrogas with the fuel-to-air equivalence ratio ranging from 0.6 to 1.6 at normal pressure are shown to exhibit the detonability close to that of the homogeneous air mixtures of ethylene and propylene. On the one hand, this indicates a high explosion hazard of pyrogas, which can be formed, e.g., in industrial and household fires. On the other hand, pyrogas can be considered as a promising fuel for advanced propulsion powerplants utilizing the thermodynamic Zel’dovich cycle with detonative combustion, e.g., solid-fuel detonation ramjets. In view of it, the novel conceptual design of the dual-duct detonation ramjet demonstrator intended for operation on pyrogas at the cruising flight speed of Mach 2 at sea level has been developed. The ramjet demonstrator has been manufactured and preliminarily tested in a pulsed wind tunnel at Mach 1.5 and 2 conditions. In the test fires, a short-term onset of continuous detonation of ethylene was registered at both Mach numbers. |
| Databáze: | OpenAIRE |
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