Changsha centrifugal fan Low priced wholesale sales, centrifugal fans use in wind energy in

Edit: wind Standard Electrical fan experts more price and specifications please visit Ali's official website: http: //fbemf2014.1688.com with the increasing development of science and technology and energy demand, environmental issues are urgent, wind energy as a kind of clean, renewable green energy for its unique advantages more and more social attention [1-3]. Wind turbine power generation is the main form of use of wind energy, wind turbine blades is an important component to absorb wind energy, and is the most basic element airfoil blade design. Large wind turbine airfoil rotor blades used Reynolds number is usually between 1 × 106 ~ 6 × 106. Wind tunnel experiments [4-5] and numerical simulations [6-8] are two means of assessing the airfoil aerodynamic performance, but due to the limitation of the size of the model with experimental wind speed, low Reynolds number airfoil wind tunnel experiments usually can not cover all Renault number range, Reynolds airfoil surface transition leading to different positions, airfoil surface flow does not match with the actual situation, the position of laminar flow, turbulence range, the separation point, the pressure distribution and airfoil lift, drag and moment features are there are some differences with the real situation. In order to maximize the real simulation of the actual flow, the method adopted in the leading edge of the airfoil rough paste with a fixed transition experiments. In addition, due to the manufacturing process, surface aging, insect bodies piled, wind and rain and the surface ice and other reasons, commercial use of the wind turbine blade leading edge actually has some roughness. During the experiment, it is difficult to accurately simulate the usual method is also arranged in the rough with the leading edge of the airfoil. Rough paste with a man on the model surface roughness elements, with a fixed boundary layer flow from the state to the turbulent transition location, the basic requirement is that while causing additional transition impact as small as possible, airfoil experiments requiring as small as the width of the rough with the rough elements distributed as evenly as possible, with a coarse paste, solid, and easy to repeat, easy to remove and do not damage model [6]. With diverse forms of rough, rough elements for height, the density also has general calculation method and selection requirements. A lot of practice shows that the type and parameters of the experimental results with the rough has important implications, need to be very careful to choose [9-15].