The work presented in this paper has two major aspects: (i) investigation of a simple, yet efficient model of the NREL (National Renewable Energy Laboratory) 5-MW reference wind turbine; (ii) nonlinear control system development through a real-time nonlinear receding horizon control methodology with application to wind turbine control dynamics. In this paper, the results of our simple wind turb...

A circuit model is proposed in this paper for calculating the transient potential rise on the wind turbine struck by lightning. The model integrates the blade, sliding contact site, and tower and grounding system of the wind turbine into an equivalent circuit. The lightning current path from the attachment point to the ground can be fully described by the equivalent circuit. The transient poten...

The unsteady flow caused by the interaction of guide vanes and runner is investigated for an axial turbine. The calculation is performed in parallel. The solution algorithm and the parallelization procedures are described. The parallelization is obtained by domain decomposition with overlapping meshes. The interaction of rotor and stator is handled by a sliding interface where downstream the no...

The engineering and scientific community has been searching for the identification of surrogate fuels that can reasonably represent the performance and emissions behavior of jet fuels (e.g., Jet A, JP-8) in engines. Many proposals exist in the literature, but there has been no consensus of opinion. It has been recognized that if the surrogate (or its) components were identified and agreed upon,...

Turbine oil plays an important role in supporting optimal steam turbine performance. Some additives in turbine oil can cause emulsification when the oil is contaminated by water, so demulsibility is a very important property of the steam turbine oil. In order to improve the demulsibility of steam turbine oil, two kinds of polyether-silicone comb copolymers are synthesized and used as steam turb...

Large eddy simulation (LES) using the dynamic Smagorinsky model (DSM) (Germano et al., 1991) and discretely kinetic energy conserving numerical methods (Mahesh et al., 2004) has successfully predicted complex flows such as gas turbine combustors and marine propulsor crashback (e.g. Vyšohlid and Mahesh (2005); Chang et al. (2008); Jang and Mahesh (2010, 2012); Verma et al. (2012)). This paper di...

Surveys have shown that noise from wind turbines is perceived as annoying by a proportion of residents living in their vicinity, apparently at much lower noise levels than those inducing annoyance due to other environmental sources. The aim of the present study was to derive the exposure-response relationship between wind turbine noise exposure in L(den) and the expected percentage annoyed resi...

Water supply is a core service on which civilised society depends. It involves considerable energy consumption and, as a result, CO2 emissions (in water treatment, pumping and monitoring) and economic costs. Treated water is most commonly supplied from a central storage reservoir by gravity throughout a catchment and this water must be supplied within satisfactory pressure bands. Where the pres...

A detailed review of the current state-of-art for wind turbine blade design is presented, including theoretical maximum efficiency, propulsion, practical efficiency, HAWT blade design, and blade loads. The review provides a complete picture of wind turbine blade design and shows the dominance of modern turbines almost exclusive use of horizontal axis rotors. The aerodynamic design principles fo...