Computational Study of Propeller–Wing Aerodynamic Interaction

TLDR

The study investigates how the propeller and wing of a C130J aircraft interfere with each other, focusing on the impact of installed propeller flow‑fields on wing aerodynamics. Using Kestrel simulation tools, the authors model the wing, nacelles, and a Dowty six‑bladed R391 propeller mounted at inboard or outboard wing sections in single and dual configurations, considering only these geometries. The simulations reveal that installed propellers create asymmetric blade loadings, enhance wing lift distribution (with side‑dependent lift increases), delay flow separation, and validate Kestrel’s effectiveness for propeller design, potentially reducing future test requirements.

Abstract

Kestrel simulation tools are used to investigate the mutual interference between the propeller and wing of C130J aircraft. Only the wing, nacelles, and propeller geometries are considered. The propulsion system modelled is a Dowty six-bladed R391 propeller mounted at inboard or outboard wing sections in single and dual propeller configurations. The results show that installed propeller configurations have asymmetric blade loadings such that downward-moving blades produce more thrust force than those moving upward. In addition, the influence of installed propeller flow-fields on the wing aerodynamic (pressure coefficient and local lift distribution) are investigated. The installed propeller configuration data are compared with the non-installed case, and the results show that propeller effects will improve the wing’s lift distribution. The increase in lift behind the propeller is different at the left and right sides of the propeller. In addition, the propeller helps to delay the wing flow separation behind it for tested conditions of this work. Finally, the results show the capability of Kestrel simulation tools for modeling and design of propellers and investigates their effects over aircraft during conceptual design in which no experimental or flight test data are available yet. This will lead to reducing the number of tests required later.