Distributed electric propulsion and boundary layer ingestion are two attractive technologies to reduce the power consumption of fixed wing aircraft. Through careful distribution propulsive system elements, higher aerodynamic efficiency can be achieved, as well a lower risk total loss aircraft due foreign object damage. When used on wing, further reductions bending moment root even lead its stru...

The interaction between the slipstream of propellers and wing an aircraft with distributed electric propulsion (DEP) could benefit aerodynamics. A conceptual design optimization are carried out in order to increase range general aviation without affecting its takeoff landing velocity same fuselage condition. Propellers modelled using actuator disk (AD) theory, is vortex lattice method (VLM) obt...

Abstract Research on propeller performance has been reinvigorated by the development of new classes vehicles, ranging from electrically powered fixed-wing aircraft, to multi-rotor electrical Vertical Take-off/Landing (eVTOL) vehicles and tilt-rotor aircraft. These types aircraft utilise a range modern propellers, often with more advanced planforms features such as anhedral, operate in flight en...

An approximate numerical mthod is presented for analysis and determination of modal characteristics in straight, pretwisted non-unifom helicopter blades. The analysis considers the coupled flapwise bending (out of plane), chordwise bending (in plane), and torsion vibration of both rotating and non-rotating blades. The proposed method is based on the integral expansion of Green functions (struct...

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 ...

An approximate numerical mthod is presented for analysis and determination of modal characteristics in straight, pretwisted non-unifom helicopter blades. The analysis considers the coupled flapwise bending (out of plane), chordwise bending (in plane), and torsion vibration of both rotating and non-rotating blades. The proposed method is based on the integral expansion of Green functions (struct...

The problem of launching a tethered aircraft to be used for airborne wind energy generation is investigated. Exploiting well-assessed physical principles, an analysis of three different take-off approaches is carried out. The approaches are then compared on the basis of quantitative and qualitative criteria introduced to assess their technical and economic viability. Finally, a deeper study of ...

A noisy environment dominated by low frequency noise can often be improved through the use of active noise control. This situation arises naturally in propeller aircraft where the propellers induce periodic low frequency noise inside the cabin. The cabin noise is typically rather high, and the passenger flight comfort could be improved considerably if this level were significantly reduced. This...

Abstract Given the rising importance of unmanned aerial vehicles (UAVs), this article addresses urgent scientific problem determining aerodynamic characteristics a UAV while laying out propellers for wings. We discuss methodology experimental wind-tunnel studies aircraft configurations with propellers. It is shown that characteristic feature configuration small-elongation wing absence elements ...

Abstract In this study, we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh for takeoff, hovering, yawing flight of an electric vertical takeoff landing aircraft (eVTOL). The model has four pairs coaxial propellers, is divided into three domains to move eight propeller rotate propellers. As result, clarify behavior aerodynamic ...