Control of combustion oscillations
| Autor: | I. Emiris, J. H. Whitelaw |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
General Chemical Engineering
Nozzle General Physics and Astronomy Energy Engineering and Power Technology Reynolds number General Chemistry Mechanics Combustion Methane Physics::Fluid Dynamics chemistry.chemical_compound symbols.namesake Fuel Technology Amplitude chemistry Harmonics Range (aeronautics) symbols Physics::Chemical Physics Equivalence (measure theory) |
| Zdroj: | Combustion Science and Technology. 175:157-184 |
| ISSN: | 1563-521X 0010-2202 |
| DOI: | 10.1080/00102200302363 |
| Popis: | Combinations of small quantities of fuel and imposed oscillations are shown to ameliorate combustion oscillations in ducted flows of premixed methane and air with equivalence ratios from the lean limit to stoichiometry. A sudden expansion from 51 to 80 mm stabilized the flames and the control arrangements were evaluated with an unconstricted exit and with a nozzle. The added fuel enhanced stability and reduced the amplitude of low-frequency oscillations associated with high strain rates and their tendency to modulate acoustic frequencies at high equivalence ratios. The imposed oscillations at harmonics of the acoustic frequencies moderated the latter. The two together caused substantial reductions in amplitude of combustion oscillations over a wide range of equivalence ratios and Reynolds numbers, limited only by the inability of acoustic drivers to operate with high-amplitude pressure signals. Related measurements in the absence of added fuel and imposed oscillations provided a basis for comparison. Thre... |
| Databáze: | OpenAIRE |
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