Evaluation of non-uniform water film behavior on the performance of an axial aeroengine compressor

Abstract

Two-phase flow CFD simulations are conducted to investigate the performance characteristics of an axial flow compressor operating under an excessive amount of water intrusion exposed to a rainy atmosphere. In order to obtain a certain compressor behavior under the water film irregularities, the blade surfaces are divided into a small number of regions depending on the film thickness. In addition, to examine the droplets interaction with rotating blades and splashing process, a self-compiled FORTRAN code has been used. The results showed that uneven roughening of blade surfaces is the effective technique to identify the deterioration in performance with irregular wall film thickness. The overall adiabatic efficiency and pressure ratio are decreased by 6% and 0.88 at a 5% water injection rate using an irregular rough wall model. Moreover, the increased wall film has adversely influenced the internal flow mechanism, which resulted the increase of passage shock intensity, entropy level within the main flow zone as well as the blade surface temperature.

Numerical study on the three-dimensional flow of water film on the outer surface of the hollow stationary blade

“…In that case, a water film accumulation area was formed along the vertical flow direction at both ends of the convex surface, which made the water film thickness decrease at both ends of the concave surface. Ishaque et al 26 conducted a two-phase flow CFD simulation to investigate the non-uniform water film behavior on an axial aero-engine compressor blade. The blade surfaces are divided into a set of sub-domains depending on the water film thickness.…”