Mathematics and Physics for Supercritical Spray Combustion Research

Tuesday, September 28, 1999 - 11:00am - 12:00pm
Keller 3-180
Akira Umemura (Nagoya University)
Because of transcritical nature, liquid spray used in high-pressure Diesel engine and liquid rocket engine has different atomization, gasification, ignition and combustion characteristics from that used in burners operating at near-atmospheric pressures. In this talk, elementary processes characteristic to high-pressure spray combustion are addressed and the underlying physics are revealed with the aid of mathematical analysis. Contents: transcritical condition (vanishing diffusion coefficient at critical mixing surface), three (sub-, trans- and supercritical) gasification regime map, vaporization, auto-ignition and combustion characteristics of single hydrocarbon droplet placed in an unbounded environment with temperature and pressure exceeding the critical point of the fuel, stability analysis of liquid jet with strong thermo-fluid dynamic coupling in atomization process.