Abstract
A new scheme for calculation with the discrete-vortex method and boundary-fitted coordinate systems is presented to analyze the two-dimensional jet flow issuing from the metering orifice of oil hydraulic valves. The advantage of the present scheme is that, the jet flow at high Reynolds numbers in the boundaries of arbitrary shape can be treated without conformal mapping between the physical-plane and complex potential-plane.In the present study, the boundary-fitted coordinates are generated as the solution of two elliptic partial differential equations with Dirichlet boundary conditions, and the potential-flow solution without vortices is calculated numerically by solving Laplace equations using the boundary-fitted coordinate system. Furthermore an array of discrete vortices is introduced into the flow field at appropriate time intervals at some points near the separation points. The vortices are moved by a time marching scheme using the rectangular transformed plane, after the velocity of any vortex is obtained.The present scheme is employed to simulate the two-dimensional jet flow issuing from the metering orifice of the spool valves commonly used for hydraulic power applications. A prediction of the vortex pattern of the jet flow and the pressure distribution is undertaken. The simulated results of the pressure distribution on the spool land are compared with the experimental results obtained using the three-dimensional valve model.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.