A Refined Two-Zone Heat Release Model for Combustion Analysis in SI Engines.

Numerical Simulation Techniques for the Prediction of Fluid-Dynamics, Combustion and Performance in IC Engines Fuelled by CNG

“…The required variables are calculated by implementing a suitable form of the energy conservation equation for the unburned zone and for the whole cylinder content, of the conservation of the instantaneous cylinder volume, and of a so-called 'combustion model'. The formulation of the energy conservation law is common to both simulation and diagnostic models, and can be written in the following form (Catania et al, 2003): Unburned-gas region:…”

“…(4-5) for each chemical species, by means of polynomial functions of the gas temperature. JANAF tables can be used for this purpose (Baratta et al, 2006;Catania et al, 2003Catania et al, , 2004. The unburnedgas enthalpy includes the contribution of the fuel chemical energy which is released during combustion.…”

“…As far as the c 0 coefficient is concerned, there is evidence in the literature that a fine tuning is needed if accurate results are desired (Baratta et al, 2005;Catania et al, 2003;Guezennec & Hamada, 1999). Tuning can be performed when the Woschni correlation is applied to estimate the heat transfer in a diagnostic tool, in which the experimental in-cylinder pressure trace is analyzed and the heat-release law is calculated.…”

“…Tuning can be performed when the Woschni correlation is applied to estimate the heat transfer in a diagnostic tool, in which the experimental in-cylinder pressure trace is analyzed and the heat-release law is calculated. For example, a method for calibrating the heat transfer coefficient was proposed and assessed in (Catania et al, 2003), based on the measurement of the exhaust emissions, with specific reference to HC, CO, and www.intechopen.com H 2 , and on an energy balance of the whole cylinder charge, from the start to the end of combustion. When the correlation is employed for predictive indicated-cycle calculations, the heat transfer coefficient can be set on the basis of experience previously acquired on similar engines, or can be calibrated at a few engine working points with the support of experimental tests, combined with diagnostic analysis.…”

Dynamic interaction between the structure and the trolley of high performance gantry cranes

“… analiza radnog procesa -Katani i Mitika (Cattani, Mittica) [33], Kurto-Riso, Ovome treba dodati odreĎivanje (arbitrarno) udela produkata i nesagorele smeše u ukupnoj masi gasa koja se gubi propuštanjem kroz nezaptivena mesta, kao i ukupne entalpije koja se gubi na taj način, a svodi se na primenu kvadratne funkcije udela sagorele smeše. Umesto toga biće primenjen eksplicitni postupak, i istrujavanje gasa iz pojedinih zona biće modelirano nezavisno, za svaku od zona pojedinačno.…”