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...

Drag-dominant tidal turbine energy holds tremendous clean potential but faces significant hurdles as unsuitability of the actuator disc model due to varying swept blockage area, unaccounted bypass flow downstream interaction, and rotor parasitic drag, whereas blade element momentum theory is computably effective for majorly 3-blade lift-dominated aerofoil. This study validates a novel method fi...

Underwater gliders (UGs) are becoming popular in ocean exploration. However, the main limitation for their development is supply of energy. This paper proposes a novel energy harvesting mechanism an underwater glider equipped with thermal buoyancy engine. The engine changes glider, due to difference temperature ocean, and it drives up down water. These manoeuvres drive turbine behind harvest Ba...

Abstract Dynamic inflow effects occur due to the rapid change of rotor loading under conditions such as fast pitch steps. The paper presents a setup suitable for investigation those non-axisymmetric conditions, namely individual Furthermore, insights into relevant phenomena are gathered. An control capable model wind turbine is set up in tunnel order conduct measurement controllable conditions....

As the size of wind turbine blades increases, influence geometric nonlinearity on aerodynamic, structural and design becomes more serious. In this work, efficient aero-elastic calculation large flexible is studied. order to solve problem aeroelastic caculation blades, work applied geometrically exact beam theory based Legendre spectral finite element coupled with blade momentum establish analys...

Dry friction dampers are widely used to reduce vibration. The forced vibration response of a simplified turbine blade with a new kind of under-platform dry friction dampers is studied in this paper. The model consists of a clamped blade as two rigidly connected beams and two dampers in the form of masses which are allowed to slide along the blade platform in the horizontal direction and vibrate...

Previous experimental and computational work has demonstrated that the geometry of the impeller has a significant effect on the mixing performance of continuous powder mixers. In particular, different blade patterns using either all blades pushing the powder forward (‘forward pattern’) are less effective than patterns where some of the blades push the powder backwards (‘alternate pattern’). In ...

Constantly rising operating pressure and temperature in turbine drivers push the material capabilities of turbine blades to the limit. The recent development of heterogeneous objects by layered manufacturing offers new potentials for the turbine blades. In heterogeneous turbine blades, multiple materials can be synthesized to provide better properties than any single material. A critical task o...

The quantification of torques and moments inertia horizontal axis hydrokinetic turbine driveline is important to precisely predict the dynamic behavior complete system. Initially, this paper presents different models used in literature for describing components. A model a small using belt transmission developed. uses Blade Element Momentum (BEM) determining power coefficient rotor considers ine...

Abstract. We present an analytical model for assessing the aerodynamic performance of a wind turbine rotor through different parametrization classical blade element momentum (BEM) model. The is named Radially Independent Actuator Disc (RIAD) model, and it establishes relationship between local thrust loading power, known as local-thrust coefficient local-power respectively. has direct physical ...