An experimental study was conducted to investigate the interferences of wind turbines sited over hilly terrains in order to elucidate the underlying physics to explore/optimize design of wind turbines sitting over complex terrains for higher power yield and better durability. The experiments were conducted in an atmospheric boundary layer wind tunnel with wind turbines sited over two-dimensiona...

Civil engineering structures, such as tall buildings and long span bridges, are typically designed based on the principles of material and structural mechanics. Finite element model (FEM) analysis and wind tunnel tests of scaled models are often carried out to assist structural design (see, e.g., Penman et al. 1999). However, loading conditions in the real world are always much more complicated...

Wind tunnel to Atmospheric Mapping (WAM) is a methodology for scaling and testing a static aeroelastic wind tunnel model. The WAM procedure employs scaling laws to define a wind tunnel model and wind tunnel test points such that the static aeroelastic flight test data and wind tunnel data will be correlated throughout the test envelopes. This methodology extends the notion that a single test co...

in general, the aerodynamic stability of long span bridges is evaluated based on the results of wind tunnel tests in the low reynolds number region, because in almost all wind tunnel tests, it is impracticable to satisfy reynolds number similitude. therefore, in order to correctly evaluate conventional wind tunnel test results, reynolds number effects on the aerodynamic force coefficients acting o...

A method for accurately measuring the drag associated with a protuberance on an aircraft has been devised and implemented in a wind tunnel using a C-130 model. The C-130 aircraft has been heavily modified for various different configurations and the impact that these modifications have had on the aerodynamic performance of the aircraft has not been well documented. This paper describes a method...

A wire suspension system to enable wind tunnel Virtual Flight Testing of missile models has been designed, built, and tested. This prototype used six steel cables to suspend a model-mounting collar in the tunnel. The collar contained a three-axis ball-bearing pivot to enable roll, pitch, and yaw motion. Tension load cells in each of the cables allowed measurement of forces on the model. This pa...

The synthesis and experimental validation of an active utter suppression controller for the Active Flexible Wing wind-tunnel model is presented. The design is accomplished with traditional root locus and Nyquist methods using interactive computer graphics tools and extensive simulation-based analysis. The design approach uses a fundamental understanding of the utter mechanism to formulate a sim...