Modelling and Simulation of Fluid Flow between Two Discs Rotating at Different Direction

Abstract

This paper presents the modelling and simulation work for the fluid flow between two discs rotating in opposite direction, commonly known as the contra rotating discs system. These systems of the discs may apply to future generation engines of high rotating speeds (Gan et al., 1995). Two turbulence models, the low Reynolds number k-ε model and low Reynolds number second moment closure with finite-difference approach have been implicated to obtain the numerical solution. All the simulation work has been carried out according the experimental work of (Chen et al., 1997) for the range of Reynolds number and mass flow rate ReӨ = 1.14x106 ≤ 1.19x106 and Cw= 4026≤ 9351respectivily , at the disc speed ratio, Γ=-1. Simulated results of radial and tangential velocity profiles at different radial location showed fine agreement with the measurements. The computed moment coefficients of both the models illustrated the similar trend of variation in accordance to the mass flow rate and rotational. speed of the discs