Abstract
Diverse approaches to HFCG's inductance,resistance and armature expansion calculating are evaluated. Comparison of simulated and experimentally obtained results is provided. Validity criteria for different simulation models are proposed. Consideration of armature acceleration under the pressure of detonation products is shown to be beneficial for accuracy of HFCG simulation. Control of HFCG temperature during simulation enables detecting critical points of system operation.
Highlights
Helical flux-compression generators (HFCG) are the useful compact power sources
HFCG simulation by this code is presented in the paper
Two approaches are available to describe armature expansion: the armature expanding part is either considered to be a cone, which angle is equal to the armature expansion angle defined by Gurney equation [8], or calculated by equations of a hollow tube motion under the pressure of detonation products according to [6], [9] (”Gurney” or ”pressure” options)
Summary
Helical flux-compression generators (HFCG) are the useful compact power sources. Development of high-performance generators requires accurate modelling of HFCGs operation by the use of a 2D or even a 3D approach [1]–[4] and consideration of multiple factors [5], [6] affecting HFCG gain, efficiency and output parameters. Unavoidable effects like inter-turn proximity effect in the helical coil, diffusion losses in the vicinity of the contact point between armature and stator, magnetic field pressure affecting the expanding armature motion, hightemperature effects and etc. Consideration of all nonlinear effects (nonlinear diffusion, magnetic field pressure) can be turned off to reveal their influence on FCG operation (”linear” or ”nonlinear” options)
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