椭球体水动力及流场的数值模拟和试验研究OACSTPCD

The hydrodynamic,surface pressure and flow field characteristics of the ellipsoid in direct and oblique navigation were studied by numerical simulation and experimental test.The effects of velocity and drift angle on the force and torque of the ellipsoid and the variation of surface pressure under these factors were discussed.Finally,the velocity field of the ellipsoid at different drift angles was obtained by PIV(particle image velocimetry)test system.Compared with the numerical method,the flow separation phenomenon of the ellipsoid at different drift angles was demonstrated.The results showed that under direct navigation,the ellipsoid resistance increases with the increase of velocity,the axial pressure is high at the bow and stem,and low at the middle,and the flow separation is not obvious.Under oblique navigation conditions,with the increase of drift angle,the resistance decreases,the lateral force and yaw moment increase,the pressure on the upstream and downstream surfaces increases,the vorticity increases and the flow separation point moves forward.The results provide a reference for the maneuverability prediction of submarines and other underwater vehicles.