Navigation Links
Enhancing the efficiency of wind turbines
Date:11/21/2010

r the same level of operational range. The team is also investigating a characteristic airfoil in a new anechoic wind tunnel facility at Syracuse University to determine the airfoil lift and drag characteristics with appropriate flow control while exposed to large-scale flow unsteadiness. In addition, the effects of flow control on the noise spectrum of the wind turbine will be also assessed and measured in the anechoic chamber.

Another problem with wind energy is drag, the resistance felt by the turbine blades as they beat the air. Scientists at the University of Minnesota have been looking at the drag-reduction effect of placing tiny grooves on turbine blades. The grooves are in the form of triangular riblets scored into a coating on the blade surface. They are so shallow (between 40 and 225 microns) that they can't be seen by the human eye -- leaving the blades looking perfectly smooth.

Using wind-tunnel tests of 2.5 megawatt turbine airfoil surfaces (becoming one of the popular industry standards) and computer simulations, they are looking at the efficacies of various groove geometries and angles of attack (how the blades are positioned relative to the air stream).

Riblets like these have been used before, in the sails on sailboats taking part in the last America's Cup regatta and on the Airbus airliner, where they produced a drag reduction of about 6 percent. The design of wind turbine blades was, at first, closely analogous to that of airplane wings. But owing to different engineering concerns, such as turbine blades having a much thicker cross section close to the hub and wind turbines having to cope with peculiar turbulence near the ground, drag reduction won't be quite the same for wind turbines.

University of Minnesota researchers Roger Arndt, Leonardo P. Chamorro and Fotis Sotiropoulos believe that riblets will increase wind turbine efficiency by about 3 percent.


'/>"/>

Contact: Jason Socrates Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

Page: 1 2

Related biology news :

1. GEN reports on enhancing the applications of qPCR
2. Emissions from consumption outstrip efficiency savings
3. Measurements of CO2 and CO in Chinas air indicate sharply improved combustion efficiency
4. NJIT to help lead public/private partnership to develop high-efficiency homes
5. New technique improves efficiency of biofuel production
6. Finland to get a Center of Water Efficiency Excellence
7. Berkeley Lab lends expertise to India to promote energy efficiency
8. Stanford researchers awarded $6.27 million to study energy efficiency and human behavior
9. ESAs Earth observation missions: Sharing teams and facilities boosts efficiency
10. Breakthrough made in energy efficiency, use of waste heat
11. UConn chemists find secret to increasing luminescence efficiency of carbon nanotubes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/30/2014)... reefs face a suite of perilous threats in ... development and climate change, fragile coral ecosystems are ... this trend, some species of corals surrounding the ... natural protector in their tropical environment: coral guard-crabs. ... History,s Smithsonian Marine Station scientist Seabird McKeon and ...
(Date:9/30/2014)... KONG , Sept. 30, 2014 Winners of ... Economist Events, Innovation Summit scheduled to take place at the JW ... the summit, the award winners will share their experiences and the ... who have made a proven innovation over the past decade, will ... the night before the summit. It will be the first ...
(Date:9/29/2014)... the exposure to tar tended to be lower for ... Similarly, exposure to nicotine tended to be lower. , ... in several countries around the world. Previous studies have ... the smoke of these cigarettes are lower than those ... in the smoke are not necessarily linked to a ...
Breaking Biology News(10 mins):Smithsonian scientists discover coral's best defender against an army of sea stars 2Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 2Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 3Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 4Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 5Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 6Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 7Slim cigarette smokers not exposed to more harmful chemicals 2
... in which the enzyme RNA polymerase constructs chains of ... underappreciated sections of both the DNA promoter region and ... E. coli and published today (June 16) in the ... University of Wisconsin-Madison. , This fundamental research about ...
... are replaced through cell division. Researchers at Karolinska Institutet ... genetic information remains intact despite this continuous exchange of ... of the scientific journal Molecular Cell. , An adult ... which die and are replaced by cell division every ...
... this week's Analytical Chemistry, scientists at Indiana University ... cells to follow the weakest of scents. Even ... sperm cells still found their mark. , A ... to a chemical gradient) can be downloaded at ...
Cached Biology News:Basic work on E. coli identifies two new keys to regulation of bacterial gene expression 2Basic work on E. coli identifies two new keys to regulation of bacterial gene expression 3A protein complex that untangles DNA 2Even when faint, ovary scent draws sperm cells 2
(Date:9/30/2014)... AMHERST, Mass. Using a bio-mimicking analog of ... of grass, an international research team led by ... has taken a major step in developing long-sought ... to electricity for use in electronic devices. ... UMass Amherst and others at Stanford University and ...
(Date:9/30/2014)... Shimadzu Scientific Instruments has released the DSES-1000 ... tool for measuring displacement in rubber and other ... movement distance, the DSES-1000 can measure elongations up ... 10 mm. In addition, it achieves +/- 0.2 ... within +/- 100 µm below 50-mm stroke. , ...
(Date:9/30/2014)... Proove Biosciences , the commercial and research leader ... genetic test built upon research from their published P.A.I.N. ... provide physicians with an objective way to understand theirs ... between individuals. With this new test, physicians will be ... predisposition that will affect their pain tolerance. , The ...
(Date:9/30/2014)... CORD:USE Cord Blood Bank – www.corduse.com ... entered into an Equity and Exclusive Services Agreement with ... of patented technologies for the isolation of human cord ... is performing Phase I/II clinical trials in ... using Tianhe,s Stem Cell Educator Therapy showing that the ...
Breaking Biology Technology:Blades of grass inspire advance in organic solar cells 2Blades of grass inspire advance in organic solar cells 3Shimadzu’s New Long-Travel Extensometer Increases Precision for Soft Material Testing 2Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 2Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 3CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 2CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 3CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 4
... increasingly important as businesses seek to protect and enhance ... as a result of the business' products and services. ... are filed, many of them for federal trademark registration. ... as a good leading indicator of economic conditions (a ...
... Google to accept XML feeds from webmasters who want to ... version of Google Sitemaps , they showed experts that ... ,Google Sitemaps is a very useful feature for large shopping ... It ensures that the search engine result listings related to ...
... people on the Internet, 30 percent of whom are on ... will be playing with e-commerce. All that power and all ... shockwaves both in trade and communications. , ,The entire continent ... is not far behind. The process of this advance is ...
Cached Biology Technology:Why file for trademark protection? 2Why file for trademark protection? 3Why file for trademark protection? 4Givin' it to Google: Using an XML Sitemap to Boost Your Site 2Givin' it to Google: Using an XML Sitemap to Boost Your Site 3Huge cyber-tsunami developing in Asia 2Huge cyber-tsunami developing in Asia 3
... workstation offers precise 96 and 384-well transfers ... 100ul and 200ul disposable tips, the 96 ... and precision across a volume range from ... two positions that enable indexing into 384 ...
... Rabbit Tissue Arrays contain 60 rabbit tissue samples ... contains 4 unstained slides and 1 hematoxylin and ... slide contains 15 different tissues from 4 rabbit ... per slide. Each tissue sample (or core) is ...
A univariate (peak height or area) quantitative multi-component analysis package....
... The new, upgraded micro 10 represents ... that brings many of the benefits of ... of the small benchtop dispenser. Dispensing accurate ... well, the micro 10 has unique advantages ...
Biology Products: