Design of an electromagnetic accelerator for turbulent hydrodynamic mix studies

An electromagnetic accelerator in the form of a linear electric motor (LEM) has been designed to achieve controlled acceleration profiles of a carriage containing hydrodynamically unstable fluids for the investigation of the development of turbulent mix. Key features of the design include: (1) independent control of acceleration, deceleration and augmentation currents to provide a variety of acceleration-time profiles, (2) a robust support structure to minimize deflection and dampen vibration which could create artifacts in the data interfering with the intended study, and (3) a compliant, nonarcing solid armature allowing optimum electrical contact. Electromagnetic modeling codes were used to optimize the rail and augmentation coil positions within the support structure framework. Design of the driving armature and the dynamic electromagnetic braking system is based on results of contemporary studies for nonarcing sliding contact of solid armatures. A 0.6 MJ electrolytic capacitor bank is used for energy storage to drive the LEM. This report will discuss a LEM and armature design which will accelerate masses of up to 3 kg to a maximum of about 3000g/sub 0/, where g/sub 0/ is acceleration due to gravity.<>