Results from Mexnext: Analysis of detailed aerodynamic measurements on a 4.5 m diameter rotor placed In the large German Dutch Wind Tunnel DNW

摘要

This paper presents an analysis of measurements which have been taken in the EU project Mexico (Model Rotor Experiments In Controlled Conditions). In the Mexico project a large number of European research institutes and universities cooperated. The project resulted in a database of measurements on a 3 bladed 4.5 m diameter wind turbine model placed in the LLF tunnel (with a 9.5 by 9.5 m~2 open test section) of DNW in the Netherlands. Pressure and load measurements on the blade have been carried out simultaneously with stereo PIV flow field measurements. An extensive analysis of the Mexico measurements takes place within IEA Task 29 Mexnext. The paper presents recent results from this project where special attention is'paid to the influence of the rotational speed on the aerodynamic blade loads (where results from a scaled down Mexico rotor as built by KARI are also shown), the flow near the tip of the blade (the analysis of which is supported by results from a free wake lifting line code) and a comparison between calculated and measured results.