Aerodynamics of Bluff-Body Stabilized Confined Turbulent Premixed Flames

Autor:	Dilip R. Ballal, M. D. Vangsness, J. C. Pan
Rok vydání:	1992
Předmět:	Premixed flame Materials science Meteorology Turbulence Mechanical Engineering Flow (psychology) Energy Engineering and Power Technology Aerospace Engineering Mechanics Aerodynamics Fuel Technology Nuclear Energy and Engineering Turbulence kinetic energy Shear stress Combustor Ligand cone angle
Zdroj:	Journal of Engineering for Gas Turbines and Power. 114:783-789
ISSN:	1528-8919 0742-4795
Popis:	Detailed information on the influence of geometric and flow parameters on the structure and properties of recirculation zone in confined combusting flows is not available. In this paper, recirculation zone structure and turbulence properties of methane-air mixtures downstream of several conical flameholders were measured using LDA. These tests employed different blockage ratios (13 and 25 percent), cone angles (30, 45, 60, and 90 deg), equivalence ratios (0.56, 0.65, 0.8, and 0.9), mean annular velocities (10, 15, and 20 m/s), and approach turbulence levels (2, 17, and 22 percent). It was found that increasing the blockage ratio and cone angle affected the recirculation zone size and shape only slightly. Also, these parameters increased the shear stress and turbulent kinetic energy (TKE) moderately. Increasing the equivalence ratio or approach turbulence intensity produced a recirculation zone shape very similar to that found in the cold flow. TKE decreased due to turbulent dilatation produced by increased heat release. These observations are discussed from the viewpoint of their importance to practical design and combustion modeling.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::44ab1655ac6ec4b24b193bfaec900b3f https://doi.org/10.1115/1.2906657 Zobrazit plný text záznamu