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UID:0-382@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20180801T163000

DTEND;TZID=Asia/Jerusalem:20180801T173000

DTSTAMP:20230527T140717Z

URL:https://aerospace.technion.ac.il/events/development-of-aerodynamic-for
 -the-design-of-a-wind-turbine-in-a-yawed-flow/

SUMMARY:Development of Aerodynamic Model for the Design of a Wind Turbine i
 n a Yawed Flow
DESCRIPTION:Lecturer:Valentin Ognev\n Faculty:Department of Aerospace Engin
 eering\n Institute:Technion – Israel Institute of Technology\n Location:
 Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstrac
 t: \n Details: \n Energy supply is the basis for the development of a mode
 rn society. Nowadays most of the energy supply is based on fossil fuels. N
 evertheless\, the use of renewable energy has increased significantly duri
 ng the recent years.\nWind energy is one of the important sources of renew
 able energy.\nHorizontal axis wind turbines (HAWT) are by far the most pop
 ular means of converting wind energy into electrical energy. The research 
 on HAWT has been focused on the case of axial flow where the direction of
  the incoming wind is parallel to the turbine axis. Nevertheless\, wind ch
 anges its direction continuously and thus most of the time wind turbines w
 ork in yawed flow where there exists a finite angle between the turbine ax
 is of rotation and wind direction. Yawed results in a reduction in the ene
 rgy production\, but more important is the fact that it results in an unst
 eady behavior: Periodic aerodynamic loads that result in severe fatigue pr
 oblems in the various components of the turbine.\nThe aim of the present r
 esearch is to develop an efficient method of calculating the aerodynamic l
 oads that act along the wind turbine blades while it operates in yawed flo
 w.\nThe research consists of two main parts:\nIn the first part a new actu
 ator disk model for calculating the induced velocities over the disk\, is 
 combined with a blade element model for calculating the loads along the bl
 ades. The new actuator disk model is capable of modeling the non-uniform c
 haracteristics of the flow across the disk (in the radial and circumferent
 ial directions) due to the yawed flow. Because of the unsteady aerodynamic
  characteristics of the blade cross-sectional incoming flow\, the blade-el
 ement model includes the influence of unsteady effects on the blade cross-
 sectional aerodynamic coefficients.\nin the second model the loads along t
 he blades are calculated again using the blade-element model. The induced 
 velocity in the flow field is calculated after the pressure field is calcu
 lated by a solution of the pressure wave equation. The input to the wave e
 quation (Ffowcs\, Williams\, Hawking equation) are the loads along the bla
 des. Various numerical methods and approximations are used in order to mak
 e the calculations more efficient.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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DTSTART:20180323T030000

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