Application of Lorentz force local disturbance shielding on navigation vibration analysis

Abstract

In order to evaluate the actual proportion of navigation different region local noise in the total noise, the local region flow-induced vibration should be removed and subtracted. This study we have discussed the N= 1.5 Lorentz force action effects onto the three different navigation surface areas to partly suppress the vortices. Numerical simulation has been used to solve the electromagnetic field equations and the flow government equations combined with the Lorentz force source term. The results show that the striped vortex generated from the junction of the hemispherical head and cylinder body can be totally suppressed when the stream Lorentz force applied onto this area (CASE 1). And the local force applied onto the sail upside surface (CASE 2) can effectively suppress the vortex shedding from the sail’s edges, leading the drag force to decrease dramatically. Lorentz force applied on the side surface of the sail (CASE 3) will reduce the navigation moment greatly. The different areas will appear different control effects on the force changes, moment histories as well as the flow field evolutions before or after the Lorentz force applied. Lorentz force control on the sail’s upside surface can most efficaciously suppress the generation of horse-shoe or hairpin vortex, reducing flow noises and improve the navigation’s stealth capability and the maneuverability.