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Investigation on Propeller Slipstream by Using an Unstructured Rans Solver Based on Overlapping Grids

Published online by Cambridge University Press:  24 July 2017

X. Q. Gong
Affiliation:
School of Aeronautics Northwestern Polytechnical University Xi'an, China
M. S. Ma
Affiliation:
Computational Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang, China
J. Zhang
Affiliation:
Computational Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang, China
J. Tang
Affiliation:
Computational Aerodynamics Institute China Aerodynamics Research and Development Center Mianyang, China
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Abstract

Based on unstructured hybrid grid and dynamic overlapping grid technique, numerical simulations of Unsteady Reynolds Averaged Navier-Stokes equations were performed and investigation on isolated propeller aerodynamic characteristics and effects of propeller slipstream on turboprops were undertaken. The computational grid consisted of rotational subzone of propeller and stationary major-zone of aircraft, and walls criterion was used in the automatic hole-cutting procedure. Distance weight interpolation and tri-linear interpolation were developed to transfer information between the rotational and stationary subzones. The boundaries of overlapping grids were optimized for fixed axis rotation. The governing equations were solved by dual-time method and Lower Upper-Symmetric Gauss-Seidel method. The method and grid technique were verified by isolated propeller configuration and the computational results were in well agreement with the experimental data. The grid independence was studied to establish the numerical results. Finally, the flow around a turboprop case was simulated and the influence of propeller slipstream was presented by analyzing the surface pressure contours, profile pressure distribution, vorticity contours and profile streamline. It's indicated that the slipstream accelerates and rotates the free stream flow, changing the local angle of attack, enhancing the downwash effects, affecting the pressure distribution on wing and horizontal tail, as well as increasing the drag coefficient, pitching moment coefficient and the slope of lift coefficient.

Type
Research Article
Copyright
Copyright © The Society of Theoretical and Applied Mechanics 2018 

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Investigation on Propeller Slipstream by Using an Unstructured Rans Solver Based on Overlapping Grids
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