Numerical Analysis of the Flow in the Connecting Passage between the Fan Section and High Pressure Section of a Turbojet Engine

摘要

The flow field in a bifurcated channel was calculated using finite difference techniques which incorporated a body fitted coordinate system. The flow model used was incompressible and could be axisymmetric or two-dimensional and laminar or turbulent flow. The objective was to calculate the flow field for a Reynolds number of 750000. It was found that the results obtained from the axisymmetric formulation were different from the two-dimensional formulation. Since the actual flow geometry is axisymmetric this means that only the axisymmetric formulation should be used in further investigations. The maximum velocity in the channel was 1.7 times the inlet velocity which corresponds to a Mach number of greater than .5. Therefore, the flow is compressible and further investigations should incorporate this fact. (Author)