By solving unsteady Reynolds-averaged Navier-Stokes equations in absolute coordinate system, the effect of propeller slipstream on aerodynamics characteristics of a cruise configuration is studied. Moving overlapping grid technology is adopted to simulate the movement of blades. The fully implicit dual-time method and the multi-grid scheme are used in parallel environment to enhance the calculation efficiency. Comparing with the experimental values in linear region, the lift coefficients of the numerical simulation deviate from the experimental values around 2%; the calculated drag coefficients are relatively large at around 8%; and the pitching moment coefficients are in accordance with the trend of the experiments. The law of influence of slipstream on propeller aircraft is summed up. As the slipstream keeps mixing with the surrounding air during the spatial development, the boundary becomes smeared. As a result, the malformation of the developing slipstream tube affects the analysis of the effect of aircraft. To fix the above problems, flow-fields with and without slipstream are compared. The acceleration effect boundary of the slipstream is acquired by measuring the increments of local dynamic pressure and the wash effect boundary of the slipstream is obtained by measuring the local airflow angle increments. This method can better capture and explain the nonlinear phenomenon of the stability of the propeller aircraft caused by the interference of slipstream on aircraft components. Also, the wake convection and evolution of the slipstream can be revealed by the method. The present work provides certain reference for both the design of propeller aircraft and the research on slipstream effect.
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