Regimes of Unstable Expansion and Diffusion Combustion of a Hydrocarbon Fuel Jet
| Autor: | Yu. N. Dubnishchev, R. Kh. Abdrakhmanov, K. A. Sharov, V. V. Lukashov, V. V. Lemanov, V. A. Arbuzov |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Jet (fluid) Materials science Turbulence General Chemical Engineering Diffusion flame General Physics and Astronomy Energy Engineering and Power Technology Reynolds number Laminar flow General Chemistry Mechanics Combustion 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics chemistry.chemical_compound symbols.namesake Fuel Technology chemistry Propane Thermocouple 0103 physical sciences symbols Physics::Chemical Physics |
| Zdroj: | Combustion, Explosion, and Shock Waves. 54:255-263 |
| ISSN: | 1573-8345 0010-5082 |
| DOI: | 10.1134/s0010508218030012 |
| Popis: | Results of an experimental study of hydrodynamics and diffusion combustion of hydrocarbon jets are presented. Various regimes of instability development both in the jet flame proper and inside the source of the fuel jet are considered. The experiments are performed for the case of subsonic gas jet expansion into the air from a long tube 3.2 mm in diameter in the range of Reynolds numbers from 200 to 13 500. The fuel is the propane–butane mixture in experiments with a cold jet (without combustion) and pure propane or propane mixed with an inert dilutant (CO2 or He) for the jet flame. The mean velocity and velocity fluctuations in the near field of the jet without combustion are measured. Among four possible regimes of cold jet expansion (dissipative, laminar, transitional, and turbulent), three last regimes are investigated. The Hilbert visualization of the reacting flow is performed. The temperature profiles in the near field of the jet are measured by a Pt/Pt–Rh thermocouple. An attached laminar flame is observed in the transitional regime of propane jet expansion from the tube. In the case of combustion of C3H8 mixtures with CO2 or with He in the range of Reynolds numbers from 1900 to 3500, the transitional regime is detected in the lifted flame. Turbulent spots formed in the tube in the transitional regime exert a significant effect on the flame front position: they can either initiate a transition to a turbulent flame or lead to its laminarization. |
| Databáze: | OpenAIRE |
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