The aerodynamic behavior of a 48’ yacht rig 3D scale model was characterized by means of wind tunnel tests. The experimental program, performed in the Politecnico di Milano Twisted Flow Wind Tunnel, allowed the aerodynamic forces to be characterized using forced motion tests and the aeroelastic behavior of the sail plan to be studied. Preliminary results are presented with reference to the typi...

This paper reports on the Response Time Index (RTI) of sprinkler heads. The standard plunge test has been carried out in a hot wind tunnel, which is similar to the one developed at the Fire Research Station, United Kingdom. Some of the modifications have been finished in this wind tunnel for the higher accuracy purpose. About 37 liquid-in glass sprinkler heads are studied including the pendent ...

NASA Ames Research Center has developed several advanced distributed information systems to assist the distribution, analysis and management of data from experimental and numerical tests on aircraft wings and other aeronautical components. These systems provide immediate access to numerical aeronautics simulations and redefine the analysis operations for classic wind tunnel tests. The informati...

Considering the characteristics of wind tunnel tests, a position measurement system that can minimize the effects on the flow of simulated wind must be established. In this study, a motion-capture camera was used to measure the displacement responses of structures in a wind tunnel test, and the applicability of the system was tested. A motion-capture system (MCS) could output 3D coordinates usi...

The philosophy of physical modeling of atmospheric flow is discussed with special emphasis on wind-tunnel simulation techniques. The governing equations of motion are analyzed for application of laboratory testing. Key similitude parameters such as Reynolds, Froude, Rossby, and Richardson numbers, as applied to wind-tunnel requirements, are discussed. Prevalent boundary condition requirements, ...

Models are presented for the aerodynamic coefficients of Supersonic Ringsail and Disk-Gap-Band parachutes as functions of total porosity, λT, Mach number, M, and total angle of attack, αT (when necessary). The source aerodynamic coefficients data used for creating these models were obtained from a wind tunnel test of subscale parachutes. In this wind tunnel test, subscale parachutes of both par...

The objective of this study was to assess the efficiency of three mathematical models (power, exponential and logarithmic functions) for the calculation of the horizontal mass transport (HMT), as compared to the linear spline interpolation for the Cyclone Dust Sampler (CDS) and one with a Cone (CDSC), modified Wilson and Cooke trap (MWAC) and big spring number eight (BSNE). For the purposes of t...

A model of the atmospheric convective boundary layer (CBL) is realized in the thermally stratified wind tunnel of the Institute of Hydrology and Water Resources, University of Karlsruhe. Further experimental results from this model are presented. The wind tunnel with a test section 10 m long, 1.5 m wide, and 1.5 m high allows one to generate a quasi-stationary, horizontally evolving CBL, charac...

A new wind tunnel testing process under development at NASA Langley Research Center, called Modern Design of Experiments (MDOE), differs from conventional wind tunnel testing techniques on a number of levels. Chief among these is that MDOE focuses on the generation of adequate prediction models rather than high-volume data collection. Some cultural issues attached to this and other distinctions...