Large-activation-energy theory for premixed combustion under the influence of enthalpy fluctuations
نویسندگان
چکیده
منابع مشابه
Large-activation-energy theory for premixed combustion under the influence of enthalpy fluctuations in the oncoming mixture Part II: applications
Enthalpy (fuel mass fraction and/or temperature) fluctuations in the oncoming mixture are known to have important impacts on premixed combustion and in particular on combustion instability. Theoretical modeling has primarily been following an empirical approach. In Part I of the present study, an asymptotically reduced first-principle theory was derived from the reactive Navier-Stokes equations...
متن کاملLarge-activation-energy theory for premixed combustion under the influence of enthalpy fluctuations in the oncoming mixture Part I: general formulation
Premixed combustion in an enclosed chamber is susceptible to large-scale acoustic instability, which manifests as intense pressure fluctuations with predominant peaks at the characteristic acoustic frequencies of the combustor. Such an instability can occur in aeroand rocket engines as well as in land-based gas turbines (e.g., Harrje & Reardon 1972; Yu, Trouve & Daily 1991; Richards & Janus 199...
متن کاملPremixed Edge-Flames under Transverse Enthalpy Gradients
We describe flame propagation between two opposed reactive streams which may differ in their composition and temperature. A two-dimensional counterflow configuration and an irreversible Arrhenius reaction are adopted, along with the constant density approximation. Attention is focused on the influence of two nondimensional parameters. The first one, denoted by g, represents the difference in th...
متن کاملEnthalpy Calculation for Pressurized Oxy-coal Combustion
Oxy-fuel combustion is recognized one of the most promising available technologies that zero emission accomplishment may be in the offing. With coal burned under the pressure of 6MPa and oxygenenriched conditions, the high temperature and high pressure gaseous combustion product is composed of 95% CO2 and water-vapor, with the rest of O2, N2 and so on. However, once lauded as classic approach o...
متن کاملdegradation of oil impregnated paper insulation under influence of repetitive fast high voltage impulses
در طی سالهای اخیراستفاده ازمنابع انرژی تجدید پذیر در شبکه های مدرن بنا به دلایل زیست محیطی و اقتصادی به طور گسترده استفاده شده است همچون نیروگاههای بادی و خورشیدی .ولتاژتولیدی این نیروگاهها اغلب به فرم dc می باشد وادوات الکترونیک قدرت به عنوان مبدل و پل بین شکل موج dc وac استفاده می شوند.این پروسه باعث ایجاد پالسهایی برروی شکل موج خروجی می شود که می تواند وارد تجهیزات قدرت همچون ترانسفورماتور ی...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2010
ISSN: 0022-1120,1469-7645
DOI: 10.1017/s0022112010000698