Combustion Automobiles 39 Fuel 36 Motors 35 Combustion engineering 33 Internal combustion engines 32 Diesel motor 31 Gas-turbines 31 Fuel systems 29 Mathematical models 24 Liquid fuels 19 Performance 15 Biomass 14 Fluidized 14 Turbulence 12 Flue gases 11 Fluid dynamics 11 Incineration 11 Measurement 11 Purification 10 Cooling systems 9 Exhaust gas 9 Biomass energy 8 Fuel combustion 8 Coal gasification 7 Equipment and supplies 7 Explosives 7 Flame 7 Jet propulsion 7 Multiphase flow 7