A series of wind tunnel experiments was conducted to study the e ect of propeller solidity and thrust axis inclination on the propeller normalforce coe cient. Experiments were conducted in the Langley 14by 22-Foot Subsonic Tunnel with a sting-mounted, counterrotation, scalemodel propeller and nacelle. Con gurations had two rows of blades with combinations of 4 and 8 blades per hub. The solidity...

Combustion-based sources of shaft power tend to significantly penalize distributed propulsion concepts, but electric motors represent an opportunity to advance the use of integrated distributed propulsion on an aircraft. This enables use of propellers in nontraditional, non-thrust-centric applications, including wing lift augmentation, through propeller slipstream acceleration from distributed ...

The noise levels in the passenger cabin of turbopropeller-driven aircraft are typically higher than the noise levels in comparable turbofan-powered aircraft. The sources of noise in a turboprop aircraft include boundary layer flow noise, structure-borne noise due to engine vibration, and acoustic excitation of the fuselage due to the propeller, with the latter being dominant for most turboprop ...

This article presents an in-depth analysis of all electric-aircraft (AEA) architectures. work aims to provide a global vision the current AEA state art, estimate main technological gaps and drivers, identify most promising architecture configuration for future electrical aircraft in context twin-propeller 20-MW aircraft. The comparison between architectures is done based on three different figu...

In this combined experimental and numerical study, the propeller–airframe aerodynamic interaction is characterized for an aircraft configuration with propellers mounted to horizontal tailplane. The contributions of propeller airframe overall loading are distinguished in analyses by using a combination external balance internal load cell data. Validated computational fluid dynamics simulations t...

An aero-structural algorithm to reduce the energy consumption of a propeller-driven aircraft is developed through propeller design method coupled with Particle Swarm Optimization (PSO). A wide range parameters considered in optimization, including geometry airfoil at each section. The performance prediction tool employs convergence improved Blade Element Momentum Theory fed by aerodynamic chara...