Reproducible Inflow Modifications for a Wind Tunnel Mounted Research Hawt

Abstract

This paper describes a method of creating inhomogeneous inflow conditions to a horizontal axis wind turbine installed in the settling chamber of the large wind tunnel of the TU Berlin. Thereby, a steady gust (i.e. spatial velocity gradient, constant over time) is created which covers half of the swept area of the turbine. For purposes of analysis, a hotwire traversing system was used and measurements were correlated to on-blade angle of attack, velocity and blade root bending moment measurements. Moreover, the paper presents wake measurements at one downstream plane behind the turbine.