SuperGen Assembly Cranfield University. 23rd Nov. 2016

Slides:

Advertisements

Similar presentations

CFD Simulation: MEXICO Rotor Wake

Advertisements

Svetlana Marmutova Laminar flow simulation around circular cylinder 11 of March 2013, Espoo Faculty of Technology.

Wake model benchmarking using LiDAR wake measurements of multi MW turbines Stefan Kern, Clarissa Belloni, Christian Aalburg GE Global Research, Munich.

Wind Tunnel Testing of a Generic Telescope Enclosure

Rotor Performance Enhancement Using Slats on the Inner Part of a 10MW Rotor Mac Gaunaa, Frederik Zahle, Niels N. Sørensen, Christian Bak, Pierre- Elouan.

AeroAcoustics & Noise Control Laboratory, Seoul National University

Impact of Ground Boundary on Production of Short Tower Turbines - A Conceptual Study.

Technologies for Sustainable Built Environments Centre Rosario Nobile | Dr Maria Vahdati | Dr Janet Barlow | Dr Anthony Mewburn-Crook Click to edit Master.

An Experimental Investigation of Turbulent Boundary Layer Flow over Surface-Mounted Circular Cavities Jesse Dybenko Eric Savory Department of Mechanical.

Analysis of rotor wake measurements with the inverse vortex wake model Second PhD Seminar on Wind Energy in Europe October Risø National Laboratory.

Atmospheric boundary layers and turbulence II Wind loading and structural response Lecture 7 Dr. J.D. Holmes.

Axial Momentum Theory for Turbines with Co-axial Counter Rotating Rotors By Chawin Chantharasenawong Banterng Suwantragul Annop Ruangwiset Department of.

Design of Wind Turbines P M V Subbarao Professor Mechanical Engineering Department Selection of Optimal Geometrical & Kinematic Variables ….

©2011 AWS Truepower, LLC ALBANY BARCELONA BANGALORE 463 NEW KARNER ROAD | ALBANY, NY awstruepower.com | OVERVIEW OF SIX COMMERCIAL.

1 Short Summary of the Mechanics of Wind Turbine Korn Saran-Yasoontorn Department of Civil Engineering University of Texas at Austin 8/7/02.

Wind Turbine Project Recap Wind Power & Blade Aerodynamics

Computational Modelling of Unsteady Rotor Effects Duncan McNae – PhD candidate Professor J Michael R Graham.

Design Process Supporting LWST 1.Deeper understanding of technical terms and issues 2.Linkage to enabling research projects and 3.Impact on design optimization.

Wind Modeling Studies by Dr. Xu at Tennessee State University

Ahmet Ozbay, Wei Tian and Hui Hu

School of Aeronautical Engineering, Queen’s University Belfast Turbulent Wind Flow over a High Speed Train R K Cooper School of Aeronautical Engineering.

Using synthetic turbulence as an inlet condition for large eddy simulations Thomas P. Lloyd 1,2*, Stephen R. Turnock 1 and Victor F. Humphrey 2 1 Fluid.

Advisor Martin Wosnik Graduate Co-Advisor Kyle Charmanski Characterize blade design/turbine performance in free stream in student wind tunnel (and validate.

Aerodynamics and Aeroelastics, WP 2

Basic Study of Winglet Effects

Imperial College London CFD-BASED SIMULATION AND EXPERIMENT IN HELICOPTER AEROMECHANICS Richard E Brown and Stewart S Houston Integrating CFD and Experiments.

Wind Energy Program School of Aerospace Engineering Georgia Institute of Technology Computational Studies of Horizontal Axis Wind Turbines PRINCIPAL INVESTIGATOR:

Effects of Scale on Model Offshore Wind Turbines An Examination of How Well Scaled Model Wind Turbines Can Represent Full Sized Counterparts Group Members:

TOWER SHADOW MODELIZATION WITH HELICOIDAL VORTEX METHOD Jean-Jacques Chattot University of California Davis OUTLINE Motivations Review of Vortex Model.

A Survey of Aeroacoustic Considerations in Wind Turbines Robert Scott AE 6060.

Aeroservoelastic Modelling and Active Load Alleviation of Large Wind Turbine Blades Bing Feng, Ng Rafael Palacios, Eric C. Kerrigan, J. Michael R. Graham.

NUMERICAL SIMULATION OF WIND TURBINE AERODYNAMICS Jean-Jacques Chattot University of California Davis OUTLINE Challenges in Wind Turbine Flows The Analysis.

Technische Universität München Wind Energy Institute Technische Universität München Wind Energy Institute Detection of Wake Impingement in Support of Wind.

Tim Fletcher Post-doctoral Research Assistant Richard Brown Mechan Chair of Engineering Simulating Wind Turbine Interactions using the Vorticity Transport.

3 th International Symposium on Integrating CFD and Experiments in Aerodynamics U.S. Air Force Academy, CO, USA June 20-21, 2007 Integration of CFD and.

Horne Rev Offshore Windfarm Denmark

HELICOIDAL VORTEX MODEL FOR WIND TURBINE AEROELASTIC SIMULATION Jean-Jacques Chattot University of California Davis OUTLINE Challenges in Wind Turbine.

UPWIND, Aerodynamics and aero-elasticity

Challenges in Wind Turbine Flows

Supervisor: Dr David Wood Co-Supervisor: Dr Curran Crawford

WIND POWER By: Saed Ghaffari HOW DO YOU CONVERT WIND INTO ELECTRICITY

Evan Gaertner University of Massachusetts, Amherst IGERT Seminar Series October 1st, 2015 Floating Offshore Wind Turbine Aerodynamics.

Steps in Development of 2 D Turbine Cascades P M V Subbarao Professor Mechanical Engineering Department A Classical Method Recommended by Schlichting.……

Wind Energy Program School of Aerospace Engineering Georgia Institute of Technology Computational Studies of Horizontal Axis Wind Turbines PRINCIPAL INVESTIGATOR:

WIND TURBINE ENGINEERING ANALYSIS AND DESIGN Jean-Jacques Chattot University of California Davis OUTLINE Challenges in Wind Turbine Flows The Analysis.

Date of download: 5/31/2016 Copyright © ASME. All rights reserved. From: Aerodynamic Performance of a Small Horizontal Axis Wind Turbine J. Sol. Energy.

Date of download: 6/1/2016 Copyright © ASME. All rights reserved. From: Numerical Simulation of the Aerodynamics of Horizontal Axis Wind Turbines under.

Theory of Turbine Cascades P M V Subbarao Professor Mechanical Engineering Department Its Group Performance, What Matters.……

Vertical Axis Wind Turbine Noise

Wind Turbine Project Recap Wind Power & Blade Aerodynamics.

Date of download: 10/11/2017 Copyright © ASME. All rights reserved.

P M V Subbarao Professor Mechanical Engineering Department

UPWIND, Aerodynamics and aero-elasticity

Ship Hydrodynamics - Resistance

Thermo-aero Dynamic Analysis of Wind Turbines

Date of download: 10/29/2017 Copyright © ASME. All rights reserved.

DYNAMIC STALL OCCURRENCE ON A HORIZONTAL AXIS WIND TURBINE BLADE

P M V Subbarao Professor Mechanical Engineering Department

An Analytical Model for A Wind Turbine Wake

Blade Design for Modern Wind Turbines

Rotors in Complex Inflow, AVATAR, WP2

Vortex Induced Vibration in Centrifugal pump ( case study)

Design and Analysis of Wind Turbines using Dynamic Stall Effects

Experimental study of the wake regions in wind farms

Identification of Fundamental Design Parameter for A Wind Turbine

Peter Argyle, Simon Watson CREST, Loughborough University, ENGLAND

Wind-Farm-Scale Measurements Using Mobile-Based LiDAR

VALIDATION OF A HELICOIDAL VORTEX MODEL WITH THE NREL UNSTEADY AERODYNAMIC EXPERIMENT James M. Hallissy and Jean-Jacques Chattot University of California.

ECE 445 Wind Turbine Generator System Design and Characterization

Double-multiple Stream Tube Model for Darrieus Wind Turbines

Presentation transcript:

SuperGen Assembly Cranfield University. 23rd Nov. 2016 SuperGen Assembly Cranfield University. . 23rd Nov. 2016. Incident and Wake Turbulence and Interactions with Horizontal Axis Rotors. Mike Graham, Department of Aeronautics, Imperial College London Acknowledgements: Rafael Palacios-Nieto, David Hankin (BMT FM). .

Summary: HAWTs typically 3 bladed, upwind rotor machines, diameter up to ~150m, tip speed ~ 80+ms-1. [HATT prototypes typically 2 bladed, up- & down-stream rotors, diam. ~ 30m, tip speed O(10ms-1).] Rotor blades are subject to Random loads due to incident Turbulence in the ABL or in wakes of other upstream turbines when deployed in farm arrays. As part of SuperGen (MAXFARM) Imperial College is investigating aerodynamic control to reduce unsteady blade loading. This presentation will deal with some issues of the turbulence impacting the rotor blades.

Rotor Wakes. Wind-Farm (Horns Rev, offshore) Denmark)

Flow Field Computation URANS computation of the flow around a (downwind) HAWT. [Acknowledgement F. Zahle (Risoe Lab.)] Iso-contours of absolute vorticity shown. Tip and root vortices preserved well downstream of turbine when incident flow is uniform. shedding frequency.

Aeroelastic Rotor Flow Simulation [Free Wake Panel Method – unsteady vortex lattice method (UVLM), FEA Beam element dynamics, Twin-bladed rotor].

Mesh for convected turbulence field

INCIDENT TURBULENCE (ABL) Simulated Streamwise Velocity Component assuming von-Karman spectrum and Gaussian probability. u velocity component Von Karman spectrum

Power and Thrust Coefficient Response

INCIDENT TURBULENCE DISTORTION Schematic of Actuator Disc Mean Flow

Spectrum Suu of distorted small length-scale turbulence, ---- undistorted (von Karman spectrum).

Distortion of Turbulence into a HAWT Rotor (axis) Spectrum of streamwise turbulent velocity Suu, Lx/Radius marked on curves, ---- undistorted.

Incident Wakes from Upwind Rotors Mean flow and turbulence

Distortion of mean flow profile of rotor wake. Mean ΔU on axis at rotor / ΔU∞ Velocity defect ΔU∞ = 0.25U∞

Turbulence and Wake Interactions (Wind Tunnel Expt.)

Wake of a three bladed rotor in uniform incident flow (UVLM free vortex wake)

Mean wake velocity profile U(y), versus experiment of Hancock & Pascheke (o)

Actuator disc or line representation of rotors for RANS computations of turbulence in wind farms. Sinks of mean flow momentum. Sources of turbulence KE. (κ) Length-scale of rotor wake turbulence (ε) Alternatively LES simulations (eg: Porte-Agel et al.)

Spectrum of turbulence in rotor wake 1D downstream of rotor.

Autocorrelation coefficient versus time separation in wake 1D downstream of rotor.

Turbulence Energy, Length scale and dissipation in rotor wake

Conclusions Distortion of turbulence only significant if length scale of turbulence < rotor diameter. Some distortion (< 15%) of mean wake profiles may be expected. Some empirical correlations for turbulence KE. (κ) and length-scale (dissipation ε) have been estimated for a rotor wake.