Abstract
This paper evaluates the influence of radial grooves in the eccentrically deposited annulus using by mathematical modeling of fluid flow through each grooves. The inner cylinder (rotor) is eccentrically deposited and its movement is composed of two movements (rotation and precession). The outer cylinder is stationary and has radial grooves. In the first phase is defined a mathematical model of the flow, which is then applied to the 3D model of narrow gap with radial grooves. In this paper are present several variants of the computational domain with regard to the number of radial grooves. Based on the results of numerical simulations are evaluated basic variables such as pressure and velocity. There are also evaluated radial force (Fr ) and axial force (Fa ) acting on the rotor for different boundary conditions (different speeds of rotation and precession). Subsequently, the pressure gradients (Δp) are evaluated between the radial grooves for different computational domain. Results are compared to variant of narrow gap without radial grooves. Numerical simulation is realized in the program system ANSYS Fluent.
Highlights
The final 3D model of the computational domain with shown inlet and radial grooves is shown in the Figure 3
The fluid enters into the inlet pocket, passes through a narrow gap in the first radial groove and once again through narrow gap to the radial groove until the outlet pockets, when leaves the computational domain
The boundary conditions are defined at the inlet to the computational domain, the outlet from the domain and on the inner cylinder
Summary
The final 3D model of the computational domain with shown inlet and radial grooves is shown in the Figure 3. The follow definition of problem movement areas when defining the mathematical model it was necessary to create 3D geometry as a set of three elements (cylinders), as marked in Figure 4 (the inner cylinder, deforming the annulus and the outer cylinder). It is necessary to consider changing the grid at each iteration step It was selected from various alternatives from slipping grid where each of cylinder was surrounded by a layer of cells moving with and between these layers were formed annulus, which deforms see Figure 4. The radial grooves contained 20 layers of elements along the height
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