Theoretical Study On Solid Jet And Pulsed Jet In The Applicaion To Cleanup Of Oil Sludge

The solid jet and pulsed jet applied to clean crude oil sludge are investigated in this paper, the movement performance of a jet directed to impinge against a wall and the self-excited pulsed jet flow mechanism and its experimental test method are studied according to the impinging jet and the turbulent flow in self-excited pulsed jet device.The flow property in all of the impinging jet area is analyzed to indicate the extension of impingement region. The shear stress and radial velocity distribution is derived from initial condition at the nozzle to show that the wall depends on the initial condition at the nozzle.The potential turbulent equation in the impinging jet is established as a function of flow stream rotation and curvature, the standard turbulent model is improved by modifying the kinetic energy and the dissipation equation, which is applied to compute the impinging jet and the computation result is consistent with the experiment. The movement characteristics of the center of the toroid as Jet-to-target plate spacing or the Reynolds number at nozzle is mappedBy employing axisymmetric coordinate, the momentum and energy equations based on the impingement wall layer are established to compute the hydraulic profit.The numerical theory of unsteady cavitations has been set up by studying the two-fluid model of liquid and vapor. The control equations are put forward and the method of equations segregating, the mesh grid transformation and SIMPLE for two-phase fluid are discussed. The method of sharing pressure by mass fraction is discussed, which is applied to improve cavitations model for numerical simulation on self-excited pulsed jet. The mechanism of the self-excited pulse is described through dividing the pressure zone, velocity and the volume fraction zone.The stagnation pressure of pulsed jet is discussed according to the experiment of self-excited pulsed jet. The computational formulate of maximum stagnation pressure is obtained from experimental result. The optimal range of structural and operate parameters are summarized.The minimum hitting force is measured when oil sludge yielding in the experiment of solid jet and pulsed jet impinging against oil sludge, and the computational formulate of jet range is derived from experimental result.