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Engineering models for dynamic inflow phenomena

Technical Report:

Abstract

Within the CEC Joule program, a joint investigation project was started up concerning dynamic inflow effects. These effects describe the wake induced unsteadiness of the flow in the rotorplane. Aim of the project is the definition and implementation of engineering models within the current state-of-the-art computer codes for dynamic load calculations. These models are to be qualified by means of comparison with both existing sophisticated models (dynamic vortex wake calculations) and with experiments to be carried out on the Danish Tjaereborg 2 MW turbine. The first results of the project are discussed. Proposed engineering models are presented. Comparisons between results of the proposed models and the free vortex wake model of the University of the Bundeswehr, Muenchen are shown, for simplified cases, viz.: a step on the wind speed and simple pitching transients. Finally, some first measurements for a pitching transient are shown and compared with calculations for some of the models. Both measurements and calculations show important effects of dynamic inflow, resulting in large overshoots of loads compared to stationary values. The agreement between measurements and calculations is very encouraging. 12 figs., 2 tabs., 6 refs.
Authors:
Snel, H; Schepers, J G [1] 
  1. Netherlands Energy Research Foundation, Petten (Netherlands)
Publication Date:
Jun 01, 1991
Product Type:
Technical Report
Report Number:
ECN-RX-91-064
Reference Number:
SCA: 170602; 990200; PA: ECN-91.0647; SN: 91000585466
Resource Relation:
Other Information: PBD: Jun 1991
Subject:
17 WIND ENERGY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; WIND TURBINES; DYNAMIC LOADS; TURBINE BLADES; FLOW MODELS; COMPUTER CALCULATIONS; COMPARATIVE EVALUATIONS; VERIFICATION; ROTORS; TORQUE; VORTEX FLOW; WIND; VELOCITY; EXPERIMENTAL DATA; AERODYNAMICS; COMPUTERIZED SIMULATION; INCLINATION; NUMERICAL DATA; 170602; 990200; TURBINE DESIGN AND OPERATION; MATHEMATICS AND COMPUTERS
OSTI ID:
10103877
Research Organizations:
Netherlands Energy Research Foundation (ECN), Petten (Netherlands)
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Other: ON: DE92721413; TRN: 91.0647
Availability:
OSTI; NTIS (US Sales Only)
Submitting Site:
ECN
Size:
9 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Snel, H, and Schepers, J G. Engineering models for dynamic inflow phenomena. Netherlands: N. p., 1991. Web.
Snel, H, & Schepers, J G. Engineering models for dynamic inflow phenomena. Netherlands.
Snel, H, and Schepers, J G. 1991. "Engineering models for dynamic inflow phenomena." Netherlands.
@misc{etde_10103877,
title = {Engineering models for dynamic inflow phenomena}
author = {Snel, H, and Schepers, J G}
abstractNote = {Within the CEC Joule program, a joint investigation project was started up concerning dynamic inflow effects. These effects describe the wake induced unsteadiness of the flow in the rotorplane. Aim of the project is the definition and implementation of engineering models within the current state-of-the-art computer codes for dynamic load calculations. These models are to be qualified by means of comparison with both existing sophisticated models (dynamic vortex wake calculations) and with experiments to be carried out on the Danish Tjaereborg 2 MW turbine. The first results of the project are discussed. Proposed engineering models are presented. Comparisons between results of the proposed models and the free vortex wake model of the University of the Bundeswehr, Muenchen are shown, for simplified cases, viz.: a step on the wind speed and simple pitching transients. Finally, some first measurements for a pitching transient are shown and compared with calculations for some of the models. Both measurements and calculations show important effects of dynamic inflow, resulting in large overshoots of loads compared to stationary values. The agreement between measurements and calculations is very encouraging. 12 figs., 2 tabs., 6 refs.}
place = {Netherlands}
year = {1991}
month = {Jun}
}