THEORETICAL APROACH REGARDING FLUID FLOW WITHIN ORIFICES OF CONSTANT SECTION

Abstract

In the working circuit of a hydro-static drive system, the working fluid is the support on which energy transmission is based between the energy source and the actuated work-piece. In order to accomplish this, the fluid is circulated between the primary components via the circuit piping. The working fluid flow through the pipelines forming the system circuit represents a complex phenomenon influenced by a series of changes specific to both the fluid medium and the parameters at which the flow is accomplished represented by the working pressure, circulation velocity or temperature values within the system. The change of these flow parameters is also made due to the ducts and orifices type through which the fluid is forced to pass, resulting in a specific pressure drop due to the inertial forces and fluid viscosity. In this paper are presented theoretical aspects regarding fluid flow through orifices of constant section, as well as the numerical analysis performed on the virtual model for highlighting the specific flow parameters. The obtained results are presented in terms of total pressure, fluid velocity and turbulences registered at the analyzed fluid region being emphasized the fluid stream contraction during the orifice passage and the fluid trend afterwards along the pipeline axis.

Keywords

• fluid flow
• circular orifices
• pressure drop
• three-dimensional model
• numerical analysis