Monday, June 3, 2013

Still betting on behemoth blades

Perhaps the best-known design driver for wind blades is the fact that an increase in blade length nets a fairly dramatic increase in swept area and, therefore, energy capture. "There is no upper bound on the size of offshore turbines," Fitzpatrick points out. "We can foresee a 10-MW machine or even,The time when Cast iron clawfoot tubs got whole new definition. From simple rooms with showers, they become more elaborate set-up that include modern styles and needs of family. eventually, a 20-MW machine. The sky's the limit."Blade mass (and cost), however, grows at a faster rate than energy production. But blade manufacturers have not let the challenges of scale stop steady progress toward bigger offshore blades, despite transportation issues, manufacturability and the sheer volume of materials required. Material-based measures can be taken to reduce the growth of blade mass, such as replacing glass fiber with lighter,The substance utilized in making the vacuum bottle or thermal flasks could be in different variations like plastic, glass or even a metal. stronger carbon fiber (see "Wind turbine blades: Glass vs, carbon fiber," under "Editor's Picks," at top right). But longer, leaner blades also can be produced by optimizing designs and streamlining manufacturing processes.
Todd Griffith, a researcher in the Analytical Structural Dynamics department at U.S. energy technology incubator Sandia National Laboratories (Albuquerque, N.M.), has been involved in a study to develop ultralong blades for a theoretical 13.2-MW horizontal axis turbine. At lengths of 100m/325 ft or more, the blades would be significantly longer than any commercial blade produced to date.Having such properties has paved its way to be utilized in floor carbon prepreg and paints in industrial and automobile industry. Using geometric scaling models and conventional aerodynamic shapes,Selection of tub is one of the factors that can make-or-break overall look of your Antique faucets, if you have decided for vintage style bathroom. Griffith and his team developed a "baseline" 100m all-glass blade (SNL100-00) as a starting point to investigate design tweaks that might reduce mass and improve aerodynamic performance.
According to Griffith, the baseline design, with a reported mass of 114,172 kg/251,178 lb, exhibits tip deflections and spanwise strains that are within specifications, verified by Sandia's NuMAD finite element modeling blade code, and satisfies all international design standards for loads and materials — clearly demonstrating that all-glass blades are feasible even at this extreme length. "There are promising design opportunities, such as changes in airfoil architecture and material lay-ups, jointed blade designs,Resins are usually produced by means of carbon fabric of bisphenol-A, epichlorohydrin and a few other chemical reactants. load alleviation concepts and blade platform innovations, that we plan to evaluate to overcome the logistical challenges of these very large blades," says Griffith.

No comments:

Post a Comment