Quantitative research on cellular instabilities of premixed C1–C3 alkane–air mixtures using spherically expanding flames
| Autor: | Suozhu Pan, Zinong Zuo, Shibo Zhang, Yibo Xu, Zhennan Zhu, Lang Deng, Xiuchao Bao, Bo Hu, Lingan Kong |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Alkane
chemistry.chemical_classification Materials science General Chemical Engineering Energy Engineering and Power Technology Thermodynamics chemistry.chemical_element Instability Methane chemistry.chemical_compound Fuel Technology chemistry Propane Flame propagation Carbon Schlieren photography Equivalence ratio |
| Zdroj: | Fuel Processing Technology. 226:107075 |
| ISSN: | 0378-3820 |
| DOI: | 10.1016/j.fuproc.2021.107075 |
| Popis: | The cellular instabilities of premixed C1–C3 alkane–air mixtures were investigated at an initial temperature of 400 K and different initial pressures (0.25–1.5 MPa). Flame propagation images were recorded using high-speed Schlieren photography techniques. Cellular instabilities were analyzed using both qualitative and quantitative methods. The results showed that with an increase in the initial pressure, the flame instabilities of these three alkane–air mixtures increased as a result of the enhanced hydrodynamic instability. For a given initial pressure and with an increasing equivalence ratio, the thermal-diffusive instability was the main influencing factor on the flame instability of methane when Φ ≤ 1.0, whereas it was the result of hydrodynamic and thermal-diffusive instability when Φ > 1.0. The flame instability of ethane and propane was caused by the enhanced hydrodynamic and thermal-diffusive instability when Φ ≤ 1.0, whereas it was determined by diffusion-thermal instability when Φ > 1.0. Under the conditions with the strongest cellular instability, the cellular instability of these three alkane–air mixtures tended to increase with an increasing number of carbon atoms in the fuel. |
| Databáze: | OpenAIRE |
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