Development of new technologies and combined with creativity and innovation, plays the fundamental role in developing of any community′s value. Thus, in this research the design and production of hydroforming device was introduced. One of the best and most efficient technologies in the world of metal forming is wind turbine blade producing with hydroforming method which seems as an innovative m...

We present a novel 3D implementation of horizontal axis tidal turbine (HATT) in the shallow water hydrostatic code SHYFEM. The uniqueness this work involves blade element momentum (BEM) approach: is parameterized by applying sink terms x and y equations. In way, performance result both flow conditions turbine’s geometric characteristics. For these reasons, model suitable for farm-layout studies...

Abstract The wind turbine blade design is important in obtaining an effective turbine. In the field of energy, it essential to understand and parameters affecting blades order obtain a successful design. However, most are dependent on each other this makes turbines challenging task. This research paper used QBlade software analyze optimize behavior small horizontal axis applies Blade Element Mo...

Abstract. Floating offshore wind turbines may experience large surge motions, which can cause blade–vortex interaction if they are similar to or faster than the local speed. Previous research hypothesized that this phenomenon represented a turbulent wake state even vortex ring state, rendering actuator disc momentum theory and blade element invalid. This hypothesis is challenged, we show valid ...

Abstract Quantification of the performance degradation on annual energy production (AEP) a wind farm due to leading‐edge (LE) erosion turbine blades is important design cost‐effective maintenance plans and timely blade retrofit. In this work, effects LE horizontal axis turbines are quantified using infrared (IR) thermographic imaging blades, as well meteorological SCADA data. The average AEP lo...

This paper compares the performance of two alternative HVAC fan designs: a five-blade injection molded thermoplastic design, against the more traditional three-blade stamped metal version. The study was conducted using computational fluid dynamics techniques, along with finite element structural analysis, in which we attempted to optimize the air movement characteristics of the fan, as well as ...

Although the matrix element of the gluon spin operator in nucleon helicity states is known to be independent of some special choices of gauge, we show that it is not invariant under a general gauge transformation. We find that there exists a simple means of obtaining the matrix element in a different choice of gauge from a calculation made in one specific gauge. Similar conclusions hold for oth...

Coaxial rotor systems are appealing for multirotor drones, as they increase thrust without increasing the vehicle’s footprint. However, of a coaxial system is reduced compared to having rotors in line. It interest efficiency systems, both extend mission time and enable new capabilities. While some parameters have been explored, such rotor-to-rotor distance, influence pitch less understood. This...

The objective of this article is to review the methodologies used in last 15 years estimate power loss wind turbines due their exposure adverse meteorological conditions. Among methods, use computational fluid dynamics (CFD) for three-dimensional numerical simulation highlighted, as well two-dimensional CFD conjunction with blade element momentum theory (BEM). In addition, a brief other such im...

In the present study an evaluation of the potential for bend-twist coupling effects in wind turbine blades is addressed. A method for evaluation of the coupling magnitude based on the results of finite element modeling and full-field displacement measurements obtained by experiments is developed and tested on small-scale coupled composite beams. In the proposed method the coupling coefficient f...