Numerical Study on Rain Ingestion Performance of Civil Aero-engine Compressor
Aero-engine flight encounter heavy rainfall inhale a large amount of rainwater,inducing dete-rioration of compressor performance,stalling,surging,and even stopping.In order to assess the effect of rainwater ingestion on the aerodynamic performance of high-pressure compressor,a ten-stage high pressure compressor of a large bypass ratio turbofan engine was taken as the study object.Based on Euler-Lagrange equation,the performance changes of the high pressure compressor under different water content were studied numerically,and the evaporation,breakup and wall-impingement of the droplets are fully considered.The results show that the water droplets are gradually gathered to the tip of the blades due to centrifugal force.After the inlet guide vane,the diameter of the water drops is much smal-ler than the import area because of the collision and collision effect.Compared to dry air,water droplets evaporate and absorb heat,resulting in a significant decrease in temperature at upper and center of the blades.After absorbing water,the pressure ratio increase slightly,Under 5%import water content,the pressure ratio increased by 0.048%.But due to the additional torque generated by water droplets hitting the blades,the torque efficiency drops by 18.8%.
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