In this paper, a multidisciplinary optimization design method and its verification of low-noise aircraft propellers considering aerodynamics, noise, structural strength were carried out to further reduce the aerodynamic noise propellers. The Vortex Lattice Method-based Lift Surface Method Frequency-Domain-based Hanson deployed evaluate performance far-field propeller with validation by benchmar...

The aim of the present manuscript is to investigate noise footprint an isolated propeller in different flight configurations for propulsion a hybrid-electric aircraft. Experimental tests were performed at Low-Turbulence Tunnel located Delft University Technology with powered model and flush-mounted microphones tunnel floor. was investigated advance ratios order study impact propulsive energy ha...

this paper describes a contra-rotating propeller (crp) system to calculate the hydrodynamic characteristics and then design the optimum operational condition to be installed on two different large bulk carriers and vlcc. the method is based on boundary element method (bem) to obtain the hydrodynamic performance of any complicated configuration such as crp system, and then the optimum propeller ...

A noise footprint prediction framework for propeller-driven aircraft which couples an aerodynamic model and several aeroacoustic models is presented in this study. The based on the blade element momentum theory, while are a time-domain compact dipole/monopole Ffowcs-Williams Hawking's acoustic analogy, trailing edge model, hemisphere database approach including straight-ray propagation respecti...

This paper presents validation and assessment of ducted propellers for aircraft propulsion. Numerical methods simulation strategies are put forward, including steady/unsteady high-fidelity computational fluid dynamics (CFD) simulations simpler momentum-based methods. The comparisons the made using a propeller proposed by NASA. Simulations also performed analyzed at extended advance ratios, blad...

This paper describes a methodology for design and optimization of a polymer electrolyte membrane (PEM) fuel cell unmanned aerial vehicle (UAV). The focus of this paper is the optimization of the fuel cell propulsion system and hydrogen storage system for a baseline aircraft. Physics-based models, and experimentally-derived sub-system performance data are used to characterize the performance of ...

Abstract Novel-aircraft concepts consider the possibility of placing propulsor very close to fuselage ingest incoming airframe boundary layer. In this configuration, engine takes inflow at a reduced velocity, consuming less fuel in combustion process. However, induces series noise consequences that alter tonal and broadband components. The present work reports an experimental investigation anal...

This paper investigates the influence of the propeller on the drag of twin self-propelled AUVs, firstly, to examine the fleet performance for various propulsive conditions of leading and following AUV and, secondly, to study the parametric influence of transverse separations and longitudinal offsets on the fleet’s drag. A series of CFD RANS-SST simulations have been performed at the Reynolds Nu...

This study presents the results of cavitation tunnel tests carried out with model propeller of a Fisheries Research Vessel (FRV) and those of noise measurements with its full-scale propeller to validate the low-noise performance of this propeller. The tests involve the simulation of a target wake using a wake screen and the determination of the nature and extent of the observed cavitation behin...

Contra-rotating propellers have renewed interest from the naval architecture community, because of the recent development of electric propulsion drives and podded propulsors. Contrarotating propulsion systems have the hydrodynamic advantages of recovering part of the slipstream rotational energy which would otherwise be lost utilizing a conventional screw propeller system. The application of th...