Now showing items 1-5 of 5
Wake closure conditions in plug nozzle flowfields
The aerospike, of plug, nozzle is being proposed for future space launch vehicle applications. The design of the nozzle involves complex wake structures that directly affect engine performance. In particular, the closed or open wake condition of the flow determines the dependence of the base pressure on the ambient environment, ...
Analytic shape sensitivities and approximations of local and global airframe buckling constraints
An examination of available shell finite elements suitable for buckling analysis of thin walled airframe structures leads to the selection of a simple, accurate, design-oriented element, which is, then, used with slight modifications to obtain explicit, closed form equations for the stiffness and geometric stiffness matrices. ...
Durability of polymeric composites after elevated temperature aging
The Compression After Impact (CAI) strength of polymeric composites after long term elevated temperature aging is studied. Aging temperatures range from 149$\sp\circ$C to 204$\sp\circ$C (300$\sp\circ$F to 400$\sp\circ$F). Two types of matrix material are studied, a thermoset bismaleimide (5260) and a thermoplastic polyimide ...
Numerical simulation of unsteady hypersonic chemically reacting flow
The goal of this research is to develop and evaluate a new algorithm for the numerical solution of the axisymmetric Navier-Stokes equations for unsteady hypersonic flow with chemically reacting gas species. The LU-SGS algorithm with a diagonal approximation to the chemical source Jacobian is extended to encompass a logarithmic ...
Interaction of an accelerated FRC in a transverse magnetic field
The interaction and penetration of an accelerated FRC into a transverse magnetic field is studied for Tokamak refueling purposes. FRC penetration and interaction in the transverse magnetic field chamber is observed using visible light emission arrays, visible light imaging cameras, and several swept thermocouple probes. The ...