CFD Analysis Of Escape Systems In High-speed Flow Field Based On The Chimera Technique

Based on a full scale and all significant protuberances modeling and simplifying the ejection seat/occupant system geometrically and mathematically had been concerned in this paper. The grids around the seat and occupant were modeled with several blocks and the Chimera grid system was employed for this extreme complexity of the geometry. A three dimensional Reynolds-averaged Navier-Stokes code and standard k-εmodel with wall function were used to describe the turbulent compressible flow field around the seat/occupant. The CFD code used was FASTRAN, which employs Chimera techniques and is based on the control volume finite difference approach. The dynamic characteristics of the seat/occupant system for Mach number 0.9 at angles of attack from -30 to -60 degrees and the angles of sideslip from 0 to 60 degrees were investigated respectively.With the Chimera techniques N-S code and k-εmodel, the results indicates that the CFD predictions coincide with the wind tunnel data and such method can be developed as an aid to the preliminary design and configuration optimization analyses of the ejection seat.