Objetivo TO IMPROVE THE KNOWLEDGE OF AERODYNAMIC, THERMIC AND CHEMICAL MECHANISM GOVERNING THE HOMOGENEOUS COMBUSTION IN SPARK IGNITED ENGINES, PARTICULARLY THE FLAME INITIATION AND PROPAGATION PHASE AND KNOCK MECHANISM. TO CONTRIBUTE TO BUILD UP A MULTIDIMENSIONAL CODE DEALING WITH FLOW COMBUSTION IN I.E. ENGINE BY SETTING UP CORRESPONDING SPECIES SUB-MODELS. TO EVALUATE RESULTS ISSUED OF THE USE OF THESE MODELS INTO THE CODE (SPEED). Work on homogeneous combustion and knock in spark ignited (SI) engines focussed on experimental knowledge of turbulent flame initiation and propagation in real engines up to the point where knocking combustion occurs, taking into account air flow and turbulence effects. This led to the setting up of a database which could be used to validate 3-dimensional codes and combustion predictions.An experimental and modelling programme was also conducted to measure the autoignition delay in engines and to model the complicated chemical kinetic process either on extended scheme bases or reduced scheme bases. The numerical algorithms of the SPEED flow simulation code developed in a separate parallel project were extended to allow homogeneous combustion calculations. The SPEED mesh, because of its generality, is capable of a wider range of topologies than appears to be available from even sophisticated state of the art mesh generators. Its development has also opened areas of research into dynamic engine meshing.Flame propagation and flow velocities were measured in a 4-cylinder SI engine with optical access to the combustion chamber via transparent pistons. Another engine was equipped to allow optical access in the combustion chamber to a single cylinder, and set up on a bench, for measurements at given crank angles.Different numerical models were tested for simulating knock in engines and their performances compared with experimental results. All these models were based on the principle that knock is caused by autoignition of the air/fuel mixture and were thus built on more or less complex chemical kinetics mechanisms.THE PROJECT HAS THREE PARTS : - FLAME INITIATION - FLAME PROPAGATION - KNOCK INDUCING PHENOMENA STUDY. EACH PART COMPRISES : - EXPERIMENTAL WORK FOR DATA ACQUISITION MAINLY BY OPTICAL AND SPECTROSCOPIC DIAGNOSTIC - MODELLING WORK (IMPERIAL COLLEGE) - EVALUATION WORK OF THE MODELLING APPROACH RETAINED FOR INSERTION INTO THE MULTIDIMENSIONAL CODE (JRC COMPANIE) Ámbito científico natural sciencescomputer and information sciencesdatabasesnatural sciencesmathematicspure mathematicstopologyengineering and technologyenvironmental engineeringenergy and fuels Programa(s) FP1-ENNONUC 3C - Research and development programme (EEC) in the field of Non-Nuclear Energy, 1985-1988 Tema(s) Data not available Convocatoria de propuestas Data not available Régimen de financiación CSC - Cost-sharing contracts Coordinador Régie Nationale des Usines Renault Aportación de la UE Sin datos Dirección 9-11 avenue du 18 juin 1940 92500 Rueil-Malmaison Francia Ver en el mapa Coste total Sin datos Participantes (5) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo AACHEN UNIVERSITY OF TECHNOLOGY Alemania Aportación de la UE Sin datos Dirección Templergraben 55 52056 AACHEN Ver en el mapa Coste total Sin datos CORIA UNIVERSITE ROUEN Francia Aportación de la UE Sin datos Dirección Ver en el mapa Coste total Sin datos IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE Reino Unido Aportación de la UE Sin datos Dirección South Kensington Campus LONDON Ver en el mapa Coste total Sin datos JRC COMPANIE (VOLVO Aportación de la UE Sin datos Dirección FRANCE; VOLKSWAGEN Ver en el mapa Coste total Sin datos RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG Alemania Aportación de la UE Sin datos Dirección Albert-Überle-Strasse 3-5 69120 Heidelberg Ver en el mapa Coste total Sin datos