Numerical Investigaton of Sand Erosion Phenomena in Rotor/Stator Interaction of Jet Engine Compressor

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Sand erosion is a phenomenon where solid particles impinging to a wall cause serious mechanical damages to the wall surface. It is well-known that the performance and lifetime of various machines, such as airplane, ship, gas turbine, pump and so on, are severely degraded due to sand erosion. This phenomenon is E typical gas-particle two-phase turbulent flow and a multi-physics problem where the flow field, particle trajectory and wall deformation interact with among others. However, the change of the flow field and the relating particle trajectory during the erosion process have not been taken into account by conventional simulations. This treatment is physically unrealistic. Hence, we have developed the numerical procedure for sand erosion phenomenon, including the temporal change of the flow field and the wall shape. In the present research, I developed a code to simulate sand erosion phenomena in a rotor/stator interaction of an axial compressor, in order to clarify the physics and the effects on the aerodynamic performance.In 2006, I extended our existing code for rotational frame of reference to compute a rotor/stator interaction. Then the code was applied to a 90-degree bend with a square cross-section in which sand erosion took place. Comparing the numerical results with the experimental data, it was confirmed that the developed code can reproduce the temporal changes of the turbulent flow and eroded surface satisfactorily.In 2007, the code was applied to a rotor/stator interaction problem of an axial compressor, to clarify the physics. Investigating the numerical results, it was confirmed that the first impact leads to the most severe erosion around the rotor leading edge, and relatively severe erosion occurs around the tip of the rotor trailing edge, because centrifugal force makes a number of particles go towards the region.