The investigation shows that the ventilated cavitation goes through the phases of partial cavitation and supercavitation, the reentrant jet behaves differently in these two phases, and the transition criterion between them can be achieved from the notable change of cavitation.

Based on Boundary Element Method(BEM) of potential flow assumption, pressure recovery termination model and Re-Entrant Jet Model are adopted to analyse non-linearity of axisymmetric body.

In order to satisfy electromagnetic compatibility,this paper describes several methods to suppress the electromagnetic interference,which includes the radio frequency current circuit that can provide low impedance,avoidance crosstalk,etc.