SHUNT PROTECTION FOR SUPERCONDUCTING MAGLEV MAGNETS
Abstract Closely coupled, short-circuited shunt coils are proposed for quench protection of super-conducting Maglev magnets which use high resistance, matrix composite conductors. It is shown that, by suitable design, the shunts can reduce ac losses and that the changing currents during magnet energization or vehicle lift off and landing can be tolerated.
Superconducting Magnetic Levitation and Linear Synchronous Motor Development—The Canadian Program
The Canadian Maglev program has been reviewed previously [1–4]. We are investigating superconducting magnetic levitation, linear synchronous motor (LSM) propulsion, and guidance for 480 km/hr intercity transit along the Toronto-Ottawa-Montreal corridor for the 1990’s. Single 100-passenger vehicles weighing 300 kN are levitated with 15 cm clearance by eight vehicle-borne superconducting magnets (each 1.0 m long × 0.3 m wide, with 3.85 × 105 A turns) interacting with eddy currents induced in 80-cm-wide aluminum strips on an elevated flat-topped guideway. The aluminum strip thickness is graded from 1 cm in high-speed to 3 cm in low-speed sections to maintain total drag (magnetic and aerodynamic) almost speed independent, while minimizing the combined costs of energy requirements and aluminum amortization.
A numerical study on liquid ring motion and fragmentation for the initial process of liquid explosive dispersal
For the explosive dispersal on liquid fuel of FAE technique, the expansion of gaseous detonation products, axisymmetric radial extension and fragmentation of a liquid ring were analyzed, then corresponding models were established. By those models coupled, the numerical simulation on motion and fragmentation of the liquid ring exerted by strong action was carried out. The results computed show that the models established are feasible, and present study can offer initial conditions for the numerical simulation on the process of liquid secondary breakup and gas-liquid mixing.