   Reduced chemical reaction mechanisms: experimental and HCCI modelling investigations of autoignition processes of iso-octane in internal combustion enginesMachrafi, Hatim  ; ; et alin Fuel (2005), 84(18), 2330-2340 A semi-reduced (70 species, 210 reactions) and a skeletal (27 species, 29 reactions) chemical reaction mechanism for iso-octane are constructed from a semi-detailed iso-octane mechanism (84 species, 412 ... [more ▼] A semi-reduced (70 species, 210 reactions) and a skeletal (27 species, 29 reactions) chemical reaction mechanism for iso-octane are constructed from a semi-detailed iso-octane mechanism (84 species, 412 reactions) of the Chalmers University of Technology in Sweden. The construction of the reduced mechanisms is performed by using reduction methods such as the quasi-steady-state assumption and the partial equilibrium assumption. The obtained reduced iso-octane mechanisms show, at the mentioned conditions, a perfect coherence with another more detailed iso-octane mechanism of ENSIC-CNRS (2411 reactions and 473 species) and the semi-detailed iso-octane mechanism of Chalmers. The validity of this mechanism with regard to the ignition delay is determined for several engine parameters adhering to HCCI conditions: inlet temperature (303-363 K), equivalence ratio (0.2-0.7) and compression ratio (10-16). The ignition delay is found to be decreased by an increase in the inlet temperature, a decrease in the equivalence ratio and an increase in the compression ratio. In order to validate the effects of the inlet temperature, compression ratio on the auto-ignition delay, experiments are performed on a CFR engine. A good agreement is obtained between experimental results and calculations. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲] Detailed reference viewed: 364 (2 ULg)Carbon isotope analysis as a tool for tracing temperature during El Tremedal underground coal gasification at great depth; ; Bouquegneau, Jean-Marie et alin Fuel (2002), 81 Detailed reference viewed: 7 (0 ULg) Carbon stable isotope analysis as a tool for training temperature during el Tremedal underground coal gasification at great dept; ; Bouquegneau, Jean-Marie et alin Fuel (2002), 81 Detailed reference viewed: 19 (1 ULg)Results of the tracer tests during the El Tremedal underground coal gasification at great depthPirard, Jean-Paul ; ; et alin Fuel (2000), 79(5), 471-478 During the underground coal gasification (UCG) experiments at Alcorisa, Spain, a series of helium tracer tests were carried out to follow the underground cavity growth. The volume of the cavity increases ... [more ▼] During the underground coal gasification (UCG) experiments at Alcorisa, Spain, a series of helium tracer tests were carried out to follow the underground cavity growth. The volume of the cavity increases progressively with the cumulated quantity of oxygen injected. Models based on exchange of matter between the flowing fluid and a transverse dead zone were used. Results indicate that the gasifier behaves almost like a small number of stirred tanks in series with a high level of back mixing. (C) 2000 Elsevier Science Ltd. All rights reserved. [less ▲] Detailed reference viewed: 32 (0 ULg)Heavy water tracing test in the underground coal gasification process at Thulin (Belgium); ; et al in Fuel (1990), 69 Detailed reference viewed: 18 (1 ULg)Modelling of the underground coal gasification process at Thulin on the basis of thermodynamical equilibria and isotopic measurements; ; et al in Fuel (1990), 69 Detailed reference viewed: 33 (1 ULg)Coal gasification at pressure by mixtures of carbone dioxide and oxygen; ; et al in Fuel (1983), 62 Detailed reference viewed: 13 (0 ULg) |
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